China Indonesia

Zhejiang CHINT Electrics Co., Ltd. PT. CHINT INDONESIA

Add (Shanghai)：A3 Building, No. 3655 Sixian Road, Songjiang Shanghai 201614 Add: Prima Center 1 Complex, Block C 9-10 Pool PPD Road. Pesing Poglar No. 11. Jakarta
Tel: +86-21-5677 7777 Barat - 11710
Fax: +86-21-5677 7777 Tel: +62-21-5436-3000
E-mail: global-sales@chintglobal.com
Vietnam
Singapore
CHINT Vietnam Holding Co., Ltd
CHINT GLOBAL PTE. LTD.

SUNLIGHT ELECTRICAL VIETNAM

SUNLIGHT ELECTRICAL Singapore
Add: 20 Doc Lap Ave, VSIP, Thuan An City, Binh Duong Province, Vietnam
Address: 1 Third Chin Bee Road Singapore 618679
Tel: +84-0274-3743505
Tel: +65 6741 9055
Email: sales.sev@sunlightgroup-vn.com.vn
Fax : +65 6265 4586
Email: sales@sunlightgroup.com
Cambodia
India SCHNEITEC CHINT CO., LTD.
Add: Ansor Kdam Village, Sna Ansa Commune, Krokor District, Pursat Province,
Kingdom of Cambodia
Tel: +855 095353268

Philippines
CHINT ELECTRIC CO., LID. PHILIPPINE BRANCH
Europe
Italy Spain
CHINT Italia Investment Srl CHINT Electrics S.L.
Add: Via Bruno Maderna 7 30174 Venezia
Tel: +39 041.446614
Fax +39 041.5845900
E-mail: info@chint.it
Czech Republic
NOARK Electric Europe s.r.o.
Add: Sezemická 2757/2, 193 00 Prague 9
Russia
Tel: +420 226 203 120
Email: europe@noark-electric.com
Turkey

Add: Zumrutevler Mahallesi Ural Sokak No. 22/18 NAS PLAZA B Block KAT 1, Maltepe,
Istanbul
Tel: +90216 621 00 55
Fax.:+90216 621 00 50
E-mail: fatura@chint.com.tr

North America
United States Brazil
NOARK Electric (USA) Inc CHINT Elétricos América do Sul Ltda
Add: 2188 Pomona Blvd., Pomona, CA 91768
Tel: 626-330-7007
Fax: 626-330-8035
E-mail: nasales@noark-electric.com

Mexico Peru
CHINT SOLAR MEXICO S DE RL DE CV CHINT LATAM (PERU) S.A.C.
Add: Miguel Cervantes Saavedra 169 Piso 11 Col. Granada Del. Miguel Hidalgo
C.P. 11520 CDMX, México
Tel: +52 1-55-8881-6127
E-mail: marie.casillas@chint-mexico.com

West Asia & Africa

Egypt U.A.E
CHINT Electrics (Egypt) Co., Ltd CHINT MIDDLE EAST AND AFRICA DMCC
Add: Building B16 - Smart village, Abu Rawash - Giza, Egypt Add: Unit No: 2101, 21085,2109 , Jumeirah business center 1, Cluster G,
Tel: +20 1097173769 Jumeirah Lakes Towers, Dubai, UAE
P.O BOX : 00202 Tel: +97145571532 P.O BOX: 337555
Email: chinteg@chintglobal.com E-mail: global-sales@chint.com

Kenya
ZHENGTAI ELECTRICS(KENYA) CO., LIMITED
Add: OFFICE 1A，8TH FLOOR, KISM TOWERS, LR No. 209/945/1– NGONG
ROAD – NAIROBI， KENYA
Tel: +254113958911
Email: zhangyuans@chint.com

CHINT GLOBAL PTE. LTD.

Tel: +86-21-5677 7777 Web: www.chintglobal.com
Building A3, 3655 SiXian Road,
Songjiang District, Shanghai, China E-mail: gl o b a l - s a l e s @ c h i n t g l o b a l . c o m

Printed by CHINT GROUP. No part of this brochure may be used or reproduced in any manner whatsoever without written permission. CHINT is the only CHINT GROUP ALL RIGHTS Reserved Recycle Paper Printed
publisher that can modify or change the content. Parts of the pictures used in the brochure are from the Internet. Pleases contact us in any case of copyright. 2021.08
NM8N Moulded Case Circuit Breakers
Air Circuit Breaker
MCCB

NM8N NM1

Page P-001 Page P-087

Battery box
 Contents

1. General............................................................................................................................................. 01

2. Operating conditions .................................................................................................................. 01

3. Type designation .......................................................................................................................... 02

4. Technical data................................................................................................................................ 04

5. Release............................................................................................................................................. 10

6. Tripping curve ............................................................................................................................... 13

7. Mounting of circuit breaker...................................................................................................... 20

8. Overall and Mounting Dimensions ........................................................................................ 21

9. Accessories characteristics and installation ........................................................................ 49

10. Technical Supplement .............................................................................................................. 71

11. Ordering notice .......................................................................................................................... 80

 NM8N Moulded Case Circuit Breakers P- 001

1. General

NM8N series moulded case circuit breaker is suitable for the circuit of AC
50/60Hz, with rated voltage AC690V and below, DC system rated voltage
DC1000V and below, and rated current of 16A and 1600A. It can protect circuits
and electric equipment against overload, short circuit or undervoltage, and
can also provide protection of overload, short circuit and under voltage for
infrequent start of motor.

Products have functions of power distribution protection, motor protection,

residual current protection and isolation.

The circuit breaker can be installed vertically, installed horizontally and can also
B
enter the line from the bottom.

Standards compliant:
IEC 60947-1 general rules for low-voltage switchgear and control equipment;
IEC 60947-2 low-voltage switchgear and control equipment circuit breakers;
IEC 60947-3 low-voltage switchgear and control equipment switches,
disconnectors and fuse combination appliances;
IEC 60947-4-1 Electromechanical contactors and motor starters
(including motor protectors) for low voltage switchgear and control equipment

2. Operating conditions

2.1 Temperature:
Operating and storage temperature is -40° C~+70° C; the average value
within 24 hours does not exceed +35° C; when the ambient temperature is
-40° C~+70° C, users need to consider derating or temperature compensation
whose details can be referred to in Page

2.2 Altitude: ≤ 2000m;

2.3 Pollution grade: Grade 3;

2.4 IP grade: IP40

2.5 Air conditions:

At mounting site, relative humidity not exceed 50% at the max temperature
of +40 ℃ , higher relative humidity is allowable under lower temperature. For
example, RH could be 90% at +20 ℃ , special measures should be taken to
occurrence of dews.
P- 002 Moulded Case Circuit Breakers NM8N

3. Type designation

3.1 NM8N Moulded Case Circuit Breaker and Switch Disconnector

Special application

Poles:
1P: 1-pole
2P: 2-pole
3P: 3-pole
4B: 4-pole, there is no over-current protection at
pole N and N-pole operates with other three poles
4C: 4-pole, there is over-current protection at pole N
and N-pole operates with other three poles

Rated current
125 : 16-20-25-32-40-50-63-80-100-125
250 : 32-63-100-125-160-180-200-225-250
400 : 250-315-350-400
630 : 400-500-630
800 : 500-630-700-800
1600 : 800-1000-1250-1600

Release type code

TM: Thermal-magnetic type
EN: Basic electronic type for power distribution
EM: Standard electronic type for power distribution
M: Magnetic type for motor protection
ENM: Basic electronic type for motor protection
EMM: Standard electronic type for motor protection
Blank：Switch disconnector type

Breaking capacity code: B, C, S, Q, H, R

(Switch disconnector type has no code)

Frame size rated current:

125：125A；250：250A；400：400A
630：630A；800：800A；1600：1600A

DC: DC MCCB
Blank: AC MCCB
SD: Switch disconnector

Design code

Design sequence number

MCCB

Company code
 NM8N Moulded Case Circuit Breakers P- 003

3.2 NM8NL Residual Current Device

B

Rated residual current code:

RCD1: 0.03-0.1-0.3-1A adjustable
(Applicable to the frame size of 125-250-400-630)
RCD2: 0.05-0.2-0.5-2A adjustable (Applicable to the
frame size of 125-250)
RCD3: 0.05-0.2-0.5-1A adjustable (Applicable to the
frame size of 400-630)
RCD4: 0.1-0.3-1-2A adjustable (Applicable to the
frame size of 400-630)

Rated residual current type:

Default: AC type, A: A type

Pole code:
3P: 3-pole
4P: 4-pole
Frame size rated current:
125：125A；250：250A；400：400A；630：630A
Residual current code

Design code

Design sequence number

MCCB

Company code
 P- 004 Moulded Case Circuit Breakers NM8N

4. Technical data
NM8N Moulded Case Circuit Breakers P- 005

B
P- 006 Moulded Case Circuit Breakers NM8N
NM8N Moulded Case Circuit Breakers P- 007

B
 P- 008 Moulded Case Circuit Breakers NM8N

NM8NL Residual Current protection module 125 250 400 630

125 250 400 630

Number of poles

Electric characteristics

Rated insulation voltage Ui (V) 1000 1000 1000 1000

Rated impulse withstand voltage Uimp (kV) 88 12 12

Rated operational voltageUe(V),AC 50/60Hz

16-20-25-32-40-50- 125-160-180-200-225-
TM 250-315-350-400A 400-500A
63-80-100-125 250
EN — 32-63-100-160-250 250-400 400-630

Rated current (A) EM — 32-63-100-160-250 250-400 400-630

of circuit breaker 16-20-25-32-40-50- 125-160-180-200-225-
M 250-315-350-400A 400-500A
63-80-100-125 250
ENM — 32-63-100-160-250 250-400 400-630

EMM — 32-63-100-160-250 250-400 400-630

0.03-0.1-0.3-1 0.03-0.1-0.3-1 0.03-0.1-0.3-1 0.03-0.1-0.3-1

Rated residual 0.05-0.2-0.5-2 0.05-0.2-0.5-2 ——

operating current
—— 0.05-0.2-0.5-1 0.05-0.2-0.5-1

—— 0.1-0.3-1-2 0.1-0.3-1-2

Rated residual non-operating current

Limit non-actuating time (ms)1)

Maximum breaking Total breaking time
100-300-500-1000 100-300-500-1000 100-300-500-1000 100-300-500-1000
time (ms) (adjustable)
Rated residual making and breaking capacity
0.25Icu 0.25Icu 0.25Icu 0.25Icu

Leakage alarm non-tripping function

Standard IEC/EN 60947-2

Residual current type A/AC A/AC A/AC A/AC

Safety of insulation

Ambient temperature

Arcing distance 0000

Dimension

90/120 105/140 140/185 140/185

Dimension with circuit
breaker (mm) Height 205 232 355 355
W×H×D
Depth 78.5 88 113 113

Weight
Weight of residual 3P 0.43 0.84 1.98 1.98
current protection
module (kg) 4P 0.51 1.08 2.69 2.69

When the residual operating current is set to 0.03A, the limit non-actuating time must be set to 0.
 NM8N Moulded Case Circuit Breakers P- 009

NM8NSD Switch Disconnector 125 250 400 800 1600

NM8NSD Switch Disconnector
125 250 400 800 1600

Number of poles 2P 3P 4P 2P 3P 4P 3P 4P 3P 4P 3P 4P
Rated operational 800-1000-1250-

B
125 250 400 800
current Ie(A) 1600
Rated operational AC (50/60Hz) 690 690 690 690 415/690
voltage Ue(V) DC 500 750 1000 500 750 1000 750 1000 750 1000 750 1500
AC : 1000
Rated insulation voltage Ui (V) 1000 1000 1000 1250
DC : 1500
Rated impulse withstand
88 12 12 12
voltage Uimp (kV)
Rated short-circuit making capacity
3.2(AC)/2(DC) 5(AC)/3.2(DC) 8(AC)/5(DC) 14 40(AC)/19.2(DC)
Icm(kA)
Rated short-time 1s 2 3.2 5 8/10 20(AC)/19.2(DC)
withstand current
Icw(kA) 3s 2 3.2 5 8/10 20
Standard
AC-22A/AC-23A AC-22A/AC-23A AC-22A/AC-23A AC-22A/AC-23A AC-22A/AC-23A
Utilization category
DC-22A/DC-23A DC-22A/DC-23A DC-22A/DC-23A DC-22A/DC-23A DC-22A/DC-22B
Safety of insulation
Ambient temperature
Arcing distance 00 000
Mechanical life
Maintenance free 15000 15000 15000 10000 6000
(CO recycle)
AC415V,In 8000 6000 4000 2000 1000
Electrical life
AC690V,In 2000 1500 1500 1000 1000
(CO recycle)
DC1000V,In 2000 1500 1500 1000 1000
Mounting and connection
—
Rear connection
——
Plug-in1)
Rear connection ——
1) —— —
Draw-out
Rear connection —— —
DIN rail ———
Dimension
62/90/120 70/105/140 140/185 195/260 210/280
Dimension(mm)
Height 140 157 255 300 286
W×H×D
2)
Depth 78.5 88 113 133
Weight
2P 0.81 1.1 ———
3P 1.05 1.75 5 9.5 13(15.5)2)
4P 1.5 2.4 5.5 12.5 17(19.5)2)

Note:
The data in "()" is for motor type
P- 010 Moulded Case Circuit Breakers NM8N

5 Release
5.1 Protection for power distribution
5.1.1 Thermo-magnetic type release TM
Thermo-magnetic release of NM8N-125, 250, 400, 630, 800 and 1600 breakers
can be set to meet
protection requirements

In In

180

5.1.2 Basic electronic type release for power distribution EN

EN electronic trip unit has three-stage protection of overload, short circuit short
time-delay and
short circuit instantaneous protection.

● Overload protection and tripping time setting

—The current value Ir can be adjusted according to the user's needs. The tripping time Tr is at the
status of 6Ir.
● Short circuit short-time delay protection and trip time setting
—The current value Isd can be adjusted according to the user's needs. Tripping time Tsd is the shortcircuit short
time-delay tripping time, which can be adjusted according to user needs.
● Short circuit instantaneous protection characteristics setting
—The current value Ii
can be adjusted according to the user's needs.
● Neutral line protection feature setting
The four-pole circuit breaker N-pole protection current value can be adjusted according to user
needs. The N pole tripping time is the same with the other three-phase poles.
5.1.3 Standard electronic type release for power distribution EM
EM release has four-stage protection of overload, short circuit short-time delay, short circuit
instantaneous protection and earth fault, with real-time current display, protection parameter
 NM8N Moulded Case Circuit Breakers P- 011

,able to turn OFF

● Overload protection and tripping time setting

— Current setting value Ir , the user can adjust the range according to the ↑ and ↓ buttons on the
panel, the range is (0.4~1.0) In, and the tripping time Tr is at the status of 6Ir
, which can be adjusted
according to user needs.
● Short circuit short-time delay protection and tripping time setting
—The current setting value Isd can be adjusted according to the user's needs, and the “OFF”
indicates function can be turned off. Tripping time Tsd is the short-circuit short-time delay tripping
time, which can be adjusted according to user needs.
● Short circuit instantaneous protection characteristics setting
—The current setting value Ii
can be adjusted according to the user's needs, and the “OFF”
indicates function can be turned off.
● Neutral line protection feature setting
—Neutral line protection of the four-pole circuit breaker (current setting value InN ), the setting
range is 0.5In , 1I n or OFF, which can be adjusted according to the user's needs. The “OFF”
position indicates that the N pole has no protection function.
● Earth fault protection
Earth fault Ig can be adjusted according to user needs, where the “OFF” means the function can
be turned off.

5.2 Protection for motor

5.2.1 Motor starting characteristics

At present, most of the motors use three-phase asynchronous induction motors, and a large part
of them use the direct start mode, namely, the electric energy does not take artificial restriction
measures, and directly feeds to start the motor, which is also called full-pressure start. When the
asynchronous motor is directly started, a high starting current of 4 to 7 times of the rated current
occurs. The reason why the asynchronous motor has a large starting current is that the motor
has certain inertia, and the rotor speed cannot be immediately changed to the rated speed after
starting. At this time, the relative rotational speed of the rotating magnetic field of the stator
(synchronous speed of the motor, slightly higher than the rated speed) is large. The rotor winding
cuts the stator magnetic field at a large speed to generate a large current; at the same time, the
magnetic field generated by the large current of the rotor in turn induces the stator winding, so
that the current also rapidly increases.
Startup parameter
Rated current (In ): current value of the motor under rated operation
Starting current (Id): The current when the motor starts, its magnitude varies with different
conditions, the average value is 7.2×In
Start peak current (Id
,): Transient current during the first two half-waves after the motor is powered
on, typically 14 × In
Start-up time (td): generally 0.5~20s, which refers to the time when the motor has starting current
Direct startup impact on the protection device
For circuit breakers with magnetic protection, if the conventional current of the magnetic trip unit
is set incorrectly, the circuit breaker will mistake the start current of the motor for short-circuit
current, causing the circuit breaker to malfunction. For the independent thermal relay, the heat
generated by the large starting current during the motor starting phase will also cause the relay
to trip. For the contactor, if the motor needs electric or regenerative braking, it needs to be able
to be broken during the motor starting phase. It generally needs to derate, in order to avoid the
malfunction of the protection device caused by the start current:
The inverse time characteristic curve of the independent thermal relay is required to be completely
above the starting current.
The short-circuit current trip setting of the circuit breaker with magnetic protection should be
greater than the peak starting current of the motor.
5.2.2 Protection solution
The NM8N Series offers start-up, control and protection solutions for two three-phase
asynchronous motors:
P- 012 Moulded Case Circuit Breakers NM8N

Three-component solution
Electromagnetic protection circuit breaker + contactor + thermal relay
Among them, the electromagnetic protection circuit breaker is used for short circuit protection, the
contactor is used for motor operation, and the thermal relay is used for overload, phase loss and
phase unbalance protection.
1）Magnetic release M
The electromagnetic protection circuit breaker has a current range of 125~800A, an adjustable
range of 9~14In and an accuracy of 20%. It is especially suitable for use in the classic threecomponent protection
solution.

Ii
Ii

Two-component solution
Integrated protection electronic circuit breaker + contactor
In the two-component solution, there is no need to use the thermal relay, and the integrated
protection electronic circuit breaker has the functions of overload, phase loss, phase unbalance
protection and short circuit protection. The integrated protection electronic circuit breaker not only
has high tripping precision, but also has reliable operation. The two-component solution consisting
of contactors and the installation time can be saved without being affected by the ambient
temperature.
2）Integrated protection: Basic electronic type release for motor protection ENM
The ENM electronic trip unit allows for tighter tolerance trip times, as detailed in the table below.

Note: 1）Setting current Isd<Ii (within tolerance).

3）Integrated protection: Standard electronic type release for motor protection EMM
The EMM electronic release not only has the protection function of the ENM release, but also adds
ground fault protection and stall protection. Moreover, it can also display real-time current, display
protection parameter information, display fault information, and have parameter setting function.
 NM8N Moulded Case Circuit Breakers P- 013

6 Tripping curve
6.1 Thermal-magnetic type for power distribution

B
P- 014 Moulded Case Circuit Breakers NM8N

NM8N-125A/160A

NM8N-250(180A)
NM8N Moulded Case Circuit Breakers P- 015

B
 P- 016 Moulded Case Circuit Breakers NM8N

6.2 Magnetic type for motor protection

NM8N-125(16A~125A)

Maximum heat withstand capacity

NM8N-250(125A~250A)

Maximum heat withstand capacity

NM8N Moulded Case Circuit Breakers P- 017

B
 P- 018 Moulded Case Circuit Breakers NM8N

6.3 Electronic type for power distribution

 NM8N Moulded Case Circuit Breakers P- 019

6.4 Electronic type for motor protection

B
 P- 020 Moulded Case Circuit Breakers NM8N

7 Mounting of circuit breaker

7.1 Modes of down-lead

7.1 Modes of down-lead

7.3 Safe distance

 NM8N Moulded Case Circuit Breakers P- 021

8 Overall and Mounting Dimensions

8.1 NM8N-125

Front connecting plate

27.5

25
54.5

Front connecting plate

Phase barrier
P- 022 Moulded Case Circuit Breakers NM8N

27.5
54.5
NM8N Moulded Case Circuit Breakers P- 023

B
P- 024 Moulded Case Circuit Breakers NM8N

NM8N-125 DIN-rail mo unting

Unit:(mm)
NM8N Moulded Case Circuit Breakers P- 025

B
 P- 026 Moulded Case Circuit Breakers NM8N

8.2 NM8N-250

34

27
60
75

20.5
34.4

27
60
75.3

20.5
34.4

34.4

27
75.3

75.3
60

60

20.5
 NM8N Moulded Case Circuit Breakers P- 027

NM8N-250 Rear connection (1P/2P)

Unit:(mm)

NM8N-250 Rear connection (3P/4P)

Rear connection

Unit:(mm)

NM8N-250 Plug-in front connection

Mounting plate

Unit:(mm)
P- 028 Moulded Case Circuit Breakers NM8N
NM8N Moulded Case Circuit Breakers P- 029

B
 P- 030 Moulded Case Circuit Breakers NM8N

8.3 NM8N-400/630
NM8N Moulded Case Circuit Breakers P- 031

B
P- 032 Moulded Case Circuit Breakers NM8N
NM8N Moulded Case Circuit Breakers P- 033

B
 P- 034 Moulded Case Circuit Breakers NM8N

8.4 NM8N-800
NM8N Moulded Case Circuit Breakers P- 035

B
P- 036 Moulded Case Circuit Breakers NM8N
NM8N Moulded Case Circuit Breakers P- 037

B
P- 038 Moulded Case Circuit Breakers NM8N

212.5
 NM8N Moulded Case Circuit Breakers P- 039

8.5 NM8N-1600

B
P- 040 Moulded Case Circuit Breakers NM8N
 NM8N Moulded Case Circuit Breakers P- 041

8.6 NM8NL

B
P- 042 Moulded Case Circuit Breakers NM8N
NM8N Moulded Case Circuit Breakers P- 043

B
P- 044 Moulded Case Circuit Breakers NM8N
NM8N Moulded Case Circuit Breakers P- 045

B
P- 046 Moulded Case Circuit Breakers NM8N
NM8N Moulded Case Circuit Breakers P- 047

B
 P- 048 Moulded Case Circuit Breakers NM8N

8.8 Wiring
 NM8N Moulded Case Circuit Breakers P- 049

9 Accessories characteristics and installation

NM8N moulded case circuit breaker has various accessory modules, which can be
found in P84 for more details
9.1 AX Auxiliary contact
9.1.1 Function
Remotely indicate the circuit breaker's making (on) or breaking / tripping (OFF) status,
connected to the auxiliary circuit of the circuit breaker.
9.1.2 Model description
B
P- 050 Moulded Case Circuit Breakers NM8N

Rated Rated current(A)

voltage(V)
NM8N Moulded Case Circuit Breakers P- 051

B
P- 052 Moulded Case Circuit Breakers NM8N
 NM8N Moulded Case Circuit Breakers P- 053

circuit breaker.
 NM8N Moulded Case Circuit Breakers P- 054

9.5.3 Electrical characteristics

Frame Operational Rated Life Power Action Making Breaking Minimum duration of
size Type operational voltage (CO recycle) consumption current duration duration ON(OFF) signal pulse

B
AC110V/DC110 ≥3
150
AC220-240V 10000
125A MOD 21-M8 150 ≤ 500ms ≤ 500ms 300ms
DC220V
150
AC380-415V ≥4
100
DC24V
AC110V/DC110 150 ≥3
AC220-240V 150 ≤ 500ms 300ms
250A MOD 22-M8 10000 ≤ 500ms
DC220V 150
AC380-415V 100 ≥4
DC24V
AC110V/DC110 300
MOD 2-M8 8000 ≥3
AC220-240V 300
400/630A ≤ 1000ms ≤ 1000ms
DC220V 300ms
300
AC380-415V 190 ≥8
DC24V

AC110V/DC110 300 ≥3
MOD 23-M8 AC220-240V 300
800A 4000 ≤ 1000ms ≤ 1000ms 300ms
DC220V 300
AC380-415V 190 ≥8
DC24V

9.5.4 Wiring diagram

 P- 055 Moulded Case Circuit Breakers NM8N

9.5.5 Installation dimension drawing

NM8N Moulded Case Circuit Breakers P- 056

B
P- 057 Moulded Case Circuit Breakers NM8N
NM8N Moulded Case Circuit Breakers P- 058

B
P- 059 Moulded Case Circuit Breakers NM8N
NM8N Moulded Case Circuit Breakers P- 060

B
P- 061 Moulded Case Circuit Breakers NM8N
NM8N Moulded Case Circuit Breakers P- 062

B
 P- 063 Moulded Case Circuit Breakers NM8N

9.8.3 Installation dimension drawing

NM8N Moulded Case Circuit Breakers P- 064

B
P- 065 Moulded Case Circuit Breakers NM8N
NM8N Moulded Case Circuit Breakers P- 066

B
P- 067 Moulded Case Circuit Breakers NM8N

CCT21/22-M8

CCT23-M8
 NM8N Moulded Case Circuit Breakers P- 068

9.19 PISD Plug-in safety device

9.1 Function

9.2 Model description

PISD 21-M8 T
B

9.20 DOB Draw-out base

9.20.1 Function

9.21 DOSD Draw-out safety device

9.21.1 Function
Used together with the plug-in base, it can ensure that the circuit breaker can
automatically trip when it is pulled out when the circuit breaker is closed.
9.21.2 Model description DOSD 23-M8 T

DOSD 23- M8 T

Circuit breaker type:T thermal magnetic circuit breaker;

E electronic circuit breaker

Series code:NM8N series

Frame size code:23 for 400/630 frame; 24 for 800 frame;

Plug-in safety device code

Note : This accessory is pre-mounted with DOB, do not need to order.

P- 069 Moulded Case Circuit Breakers NM8N

0.5m
Cable length
 NM8N Moulded Case Circuit Breakers P- 070

and modify controller parameters.,when current under 0.4In.The batteries inside box are
changeble.

PSU22-M8
B

9.25 PHS Phase barrier

9.26.1 Function
P- 071 Moulded Case Circuit Breakers NM8N
 NM8N Moulded Case Circuit Breakers P- 072

10 Technical Supplement
10.1 DC application wiring method

B
P- 073 Moulded Case Circuit Breakers NM8N
 NM8N Moulded Case Circuit Breakers P- 074

10.3 NM8N thermal magnetic circuit breaker rated operational current and
temperature compensation coefficient table

B
 P- 075 Moulded Case Circuit Breakers NM8N

10.4 NM8N electronic circuit breaker rated operational current and temperature
compensation coefficient table

10.5 Derating factor table for circuit breaker with residual current protection module
 NM8N Moulded Case Circuit Breakers P- 076

10.6 Derating factor table for circuit breakers with plug-in or draw-out accessories

10.7 NM8N Derating factor table for circuit breakers altitude

 P- 077 Moulded Case Circuit Breakers NM8N

10.8 Cascading (AC220/230/240V)

36 50 70 100 150 36 50 70 100 150 36 50 70 100 150 36 50 70 100 150 36 50 70 100 150
 NM8N Moulded Case Circuit Breakers P- 078

10.9 Cascading (AC380/400/415V)

B
36 50 70 100 150 36 50 70 100 150 36 50 70 100 150 36 50 70 100 150 36 50 70 100 150
 P- 079 Moulded Case Circuit Breakers NM8N

10.10 Selective protection

NM8N Moulded Case Circuit Breakers P- 080

B
 P- 081 Moulded Case Circuit Breakers NM8N

11 .Ordering notice
11.1 Quick selection of circuit breaker
11.1.1 Quick selection of power distribution and motor protection circuit breakers1
 NM8N Moulded Case Circuit Breakers P- 082

11.1.2 Quick selection of DC circuit breaker

NM8N

B
 NM8N Moulded Case Circuit Breakers P- 083

11.1.3 Quick selection of switch disconnector

NM8N

B
 P- 084 Moulded Case Circuit Breakers NM8N

11.2 NM8N accessory models selection table

NM8N Moulded Case Circuit Breakers P- 085

B
Note
 NM1 Moulded Case Circuit Breakers P- 087

2.Type designation
N M 1－ /

Type of N-pole for 4-P breaker*

Application: Blank: for power

B
distribution;
2: for motor protection

Release type and accessory code

(please refer to table on page 94)

Number of poles

Operation mode: Blank: direct operation with

handle;
P: motor-driven operation;
Z: Operation with rotary handle

Code of Breaking capacity :

C-basic type;
S-standard type;
H-higher type;
R-current limiting type

Frame size rated current

NM1 Design sequence number

Moulded Case Circuit Breaker MCCB code

Company code
1.General
Note *: There is types of N-pole for 4P breaker.
1.1 Certificates: KEMA, UKrSEPRO, EAC, RCC, EK;
B: Without current release components, N-Pole makes with the
1.2 Electric ratings: AC 690V,50/60HZ, 10~1250A; other three poles(N-pole first makes then breaks);

1.3 Mounting mode: Vertical and horizontal;

3. Classification
1.4 Standard: IEC/EN60947-2.
According to breaking capacity of breaker:

Standard type (C,S) Higher type (H)

Current-limiting type (R)

 P- 088 Moulded Case Circuit Breakers NM1

According to wiring mode:

Front connection

According to operation mode:

Direct operation with handle Operation with rotary handle Motor-driven operation

According to number of poles:

2P 3P 4P

4. Operating conditions

4.1 Temperature: -5℃ ~+40℃ ; the average value within 24h 4.3 Pollution grade: Grade 3
shall not exceed +35℃ .(please refer to coefficients on P79
for temperature compensation correction); for the circuit 4.4 IP grade: IP30
breaker with thermo-magnetic release, +40℃ is set to be
the standard temperature for ratings. For temperature not 4.5 Air conditions
between -5℃ ~+40℃ , please contact us for temperature At mounting site, relative humidity not exceed 50% at the
compensation correction. max temperature of +40℃ , higher relative humidity is
allowable under lower temperature. For example, RH could
4.2 Altitude: not exceed 2000m (Please contact with us for be 90% at +20℃ , special measures should be taken to
reduction coefficient if altitude at the mounted site beyond occurrence of dews.
2000m).
 P- 089 Moulded Case Circuit Breakers MN1 NM1 Moulded Case Circuit Breakers P-090 NM1 Moulded Case Circuit Breakers P- 091

5. Technical data

According to wiring mode:

Electric characteristics as per IEC 60947-2, EN 60947-2

63 125 250 400 630 800 1250 B
Rated current (A) In 40℃ 10, 16, 20, 25, 30, 32, 40, 50, 63 25, 30, 32, 40, 50, 63, 80, 100, 125 100, 125, 140, 150, 160, 175, 180, 200, 225, 250 250, 300, 315, 350, 400 400, 450, 500, 630 630, 700, 800 800, 1000, 1250
Rated insulation voltage (V) Ui
500 800 800 800 800 800 800
Rated impulse withstand voltage(kV) Uimp 6 8 8 8 8 8 8
Rated impulse withstand voltage(kV) Uimp 415 690 690 690 690 690 690
Rated impulse withstand voltage(kV) Uimp ≤ 50 ≤ 50 ≤ 50 ≤ 100 ≤ 100 ≤ 100 ≤ 100
Rated impulse withstand voltage(kV) Uimp S H C S H R C S H R S H R S H R S H R H

Number of poles 3 3 3 3 3 2 3 4 3 2 3 4 1 3 4 2 3 4 3 3 4 3 3 3 4 3 3 3 4 3 4 3 3
Rated ultimate short-circuit AC 220/230/240V 20 42 42 25 42 65 65 65 85 25 25 25 20 42 42 65 65 65 85 50 50 85 100 50 50 85 100 65 65 85 85 100 85
breaking capacity
Icu (kA, rms) AC 380/400/415V 15 35 35- 20 25 50 50 50 65 20 20 20 10 25 25 50 50 50 65 35 35 50 70 35 35 50 70 50 50 60 60 70 65
Test sequence:O-t-CO AC 660/690V - - 3 3 - 8 8 10 - 5 5 - 5 5 - 8 8 10 10 10 12 15 12 12 15 15 12 12 20 20 20
20

Rated service short-circuit breaking capacity Ics (%Icu) 50% 50% 50% 50% 50% 50%
Test sequence:O-t-CO-t-CO

Isolation function ■ ■ ■ ■ ■ ■ ■ ■

Utilization class A A A A A A A A
Front connection ■ ■ ■ ■ ■ ■ ■ ■
Rear connection ■ ■ ■ ■ ■ ■ ■
Plug in type ■ ■ ■ ■ ■ ■ ■
Shunt release ■ ■ ■ ■ ■ ■ ■ ■
Under-voltage release ■ ■ ■ ■ ■ ■ ■ ■
Auxiliary contact ■ ■ ■ ■ ■ ■ ■ ■
Alarm contact ■ ■ ■ ■ ■ ■ ■

Note:
The symbols O-t-Co, O-t-Co-t-Co are used for defining the sequence of operations.
O: breaking operation; t: the time interval between two successive short-circuit operations;
CO: a making operation followed, after the appropriate opening time, by a breaking operation.
 P- 092 Moulded Case Circuit Breakers MN1 NM1 Moulded Case Circuit Breakers P- 093 NM1 Moulded Case Circuit Breakers P- 094

6. Release 7. Product overview

Inverse time breaking action property of the over current NM1 Moulded Case Circuit Breaker
releasing of the breaker ( for power distribution) at the status
that all poles are electrified simultaneously
1 MCCB (fixed type)

No. Test current I/In Conventional time Initial status

2 Under-voltage release
Conventional 2h(In ＞ 63A),
1 1.05 Cold status
non-trip current Ih(In ≤ 63A)
3 Shunt release
2 Conventional 2h(In ＞ 63A), Right after
1.30
trip current Ih(In ≤ 63A) test no. 1

4 Alarm contact
Inverse time-delay breaking operation property of the over
current tripping of the breaker(for motor protection) at the 5 Auxiliary contact
status that all poles are electrified simultaneously(conforms to
IEC60947-3)
6 Motor-driven operation mechanism
Serial Setting Conventional Start-up
No. current time status Remark
7 Extended manual operation handle
1 1.0In ＞ 2h Cold status

2 1.2In ≤ 2h Right after test number 1 8 Mechanical interlock

10A ≤ In ≤ 25A
≤ 2min Hot state
3 1.5In
25A ≤ In ≤ 63A 9 Cage clamp terminal
≤ 4min Hot state 63A ≤ In ≤ 125A

≤ 8min Hot state 125A ≤ In ≤ 800A

10 Terminal cover
0.5s ≤ Tp ≤ 5s Cold state 10A ≤ In ≤ 25A

2s ≤ Tp ≤ 10s Cold state 25A ≤ In ≤ 63A

4 7.2In 11 Front connection plate
4s ≤ Tp ≤ 10s Cold state 63A ≤ In ≤ 125A

6s ≤ Tp ≤ 20s Cold state 125A ≤ In ≤ 800A

 NM1 Moulded Case Circuit Breakers P- 095

8. Curves (for power distribution, calibrated at 40℃ )

8.1 The characteristic curve of anti-time limit and the correcting curve of temperature see fig. B
Fig.1 NM1-63(10~32), Nm1-125(25~32) Fig.2 NM1-63(10~32), NM1-125(25~32)
Characteristic Curve Adjustment curve of temperature

10000
7200 130
3600
1200
600 120
300
120
60 110
Tripping time(s)

Rated current(%)
30
20
10 100
5
2
1 90
0.5
0.2
0.1 80
0.05
0.02

1 2 3 4 5 7 8 12 20 -5 0 10 20 30 40 50 60

Rated current times Ambient temperature (℃ )

Fig.3 NM1-63(40~63), NM1-125(40~125) Fig.4 NM1-63(40~63), NM1-125(40~125)

Characteristic Curve Adjustment curve of temperature

10000
7200
3600
1200 130
600
300
120 120
60
Tripping time(s)

Rated current(%)

30
20
110
10
5 100
2
1
0.5 90
0.2
0.1
0.05 80
0.02

1 2 3 4 5 7 8 12 20 -5 0 10 20 30 40 50 60

Rated current times Ambient temperature (℃ )

 P- 096 Moulded Case Circuit Breakers NM1

Fig.5 NM1-250 Characteristic Curve Fig.6 NM1-250 Adjustment curve of temperature

10000
7200 130
3600
1200
600 120
300
120
110

Rated current(%)
60
Tripping time(s)

30
20
100
10
5
2 90
1
0.5
0.2 80
0.1
0.05
0.02

Ambient temperature (℃ )
Rated current times

Fig.7 NM1-400 Characteristic Curve Fig.8 NM1-400 Adjustment curve of temperature

10000
7200
3600 130
1200
600
300 120
120
60
Tripping time(s)

110
Rated current(%)

30
20
10
5 100
2
1
0.5 90
0.2
0.1
0.05
80
0.02

Rated current times Ambient temperature (℃ )

 NM1 Moulded Case Circuit Breakers P- 097

Fig.9 NM1-630, NM1-800 Characteristic Curve Fig.10 NM1-630, NM1-800 Adjustment curve of temperature

130

120
B
110

Rated current(%)
Tripping time(s)

100

90

80

Rated current times Ambient temperature (℃ )

Fig.11 NM1-1250 Characteristic Curve Fig.12 NM1-1250 Adjustment curve of temperature

130

120
Tripping time(s)

Rated current(%)

110

100

90

80

Ambient temperature (℃ )
Rated current times
 P- 098 Moulded Case Circuit Breakers NM1

8.2 Temperature compensation correction

NM1 series temperature compensation coefficient table (calibration at 40℃ , for the calibration at other temperature standards
please contact with us)

Current Compensation coefficient

Type range -5℃ 0℃ 5℃ 10℃ 15℃ 20℃ 25℃ 30℃ 35℃ 40℃ 45℃ 50℃ 55℃ 60℃
NM1-63S, H 10~32A 1.18 1.17 1.16 1.14 1.12 1.09 1.07 1.05 1.03 1 0.97 0.95 0.92 0.87
NM1-63S, H 40~63A 1.16 1.16 1.15 1.14 1.12 1.10 1.08 1.06 1.03 1 0.97 0.94 0.87 0.82
NM1-125C, S, H, R 25~32A 1.18 1.17 1.16 1.14 1.12 1.09 1.07 1.05 1.03 1 0.97 0.95 0.92 0.87
NM1-125C, S, H, R 40~125A 1.16 1.16 1.15 1.14 1.12 1.10 1.08 1.06 1.03 1 0.97 0.94 0.87 0.82
NM1-250 S, H, R 100~250A 1.14 1.13 1.13 1.12 1.10 1.08 1.07 1.05 1.03 1 0.97 0.93 0.86 0.76
NM1-400S, H, R 225~400A 1.13 1.12 1.12 1.11 1.10 1.08 1.06 1.05 1.03 1 0.97 0.93 0.85 0.75
NM1-630S, H, R 400~630A 1.13 1.12 1.12 1.11 1.10 1.08 1.07 1.05 1.03 1 0.97 0.93 0.85 0.75
NM1-800S,H, R 630~800A 1.13 1.12 1.12 1.11 1.10 1.08 1.07 1.05 1.03 1 0.97 0.93 0.85 0.75
NM1-1250H 700~1250A 1.14 1.13 1.12 1.11 1.10 1.09 1.07 1.05 1.03 1 0.97 0.92 0.85 0.76

9. Wiring

Front connection(Fixed connection)

Extended connection terminals (for products 10~1250A, extended terminals are available) Connection screws

C B A
 NM1 Moulded Case Circuit Breakers P- 099

Front connection screw Front connection screw

Breaking Breaking
Frame Current Frame Current
capacity Hexagonal Hexagonal Cross capacity Hexagonal Hexagonal Cross
level (A) level (A)
code head screw (A) socket screw (B) screw (C) code head screw (A) socket screw (B) screw (C)

S ■ C ■ ■
10
H ■ S ■ ■
80
S ■ H ■ ■
16
H ■ R ■ ■

20
S
H
S
■
■
■
125
100
C
S
H
■
■
■
■
■
■
B
25
H ■ R ■ ■
S ■ C ■ ■
30
H ■ S ■ ■
63 125
S ■ H ■ ■
32
H ■ R ■ ■
S ■ S ■
40
H ■ 100 H ■
S ■ R ■
50
H ■ S ■
S ■ 125 H ■
60
H ■ R ■
S ■ S ■
63
H ■ 140 H ■
C ■ ■ R ■
S ■ ■ S ■
25
H ■ ■ 150 H ■
R ■ ■ R ■
C ■ ■ S ■
S ■ ■ 160 H ■
30 ■
H ■ R ■
■ 250
R ■ S ■
C ■ ■ 175 H ■
S ■ ■ R ■
32
H ■ ■ S ■
R ■ ■ 180 H ■
C ■ ■ R ■
S ■ ■ S ■
40
H ■ ■ 200 H ■
R ■ ■ R ■
125
C ■ ■ S ■
S ■ ■ 225 H ■
50
H ■ ■ R ■
R ■ ■ S ■
C ■ ■ 250 H ■
S ■ ■ R ■
60
H ■ ■ S ■ ■
R ■ ■ 225 H ■ ■
C ■ ■ R ■ ■
S ■ ■ S ■ ■
63 400
H ■ ■ 250 H ■ ■
R ■ ■ R ■ ■
C ■ ■ S ■ ■
S ■ ■ 300 H ■ ■
75
H ■ ■ R ■ ■
R ■ ■
P- 100 Moulded Case Circuit Breakers NM1

Front connection screw Cage clamp terminals (for products 16~400A, cage clamp
Breaking
Frame Current
capacity Hexagonal Hexagonal Cross
terminals are available)
level (A)
code head screw (A) socket screw (B) screw (C)

S ■ ■

H ■ ■
315
R ■ ■

S ■ ■
400
350 H ■ ■

R ■ ■

S ■ ■

400 H ■ ■

R ■ ■

S ■

400 H ■

R ■

S ■
630
450 H ■

R ■

S ■

500 H ■

R ■

S ■
630 H ■

R ■

S ■
630
H ■

R ■ Modes of down-lead (1) and (2) illustrated in the figure are

700
800
S ■ available for your wiring operation. For its breaking capacity may
H ■ be affected, mode of down-lead (3) is not recommended, before
800
R ■ reception of any authorized announcement from the
manufacturer; the mode of down-lead (4) is prohibited for your
wiring.
 NM1 Moulded Case Circuit Breakers P- 101

10. Overall and mounting dimensions

Fig.15a NM1-63, 125, 250 fixed connection

(mm)

Dimension NM1-63S NM1-63H NM1-125C NM1-125H NM1-250H

NM1-250S/1P NM1-250S
NM1-125S NM1-125R NM1-250R

C 85 85 85 85 102 102 102

E 48 48 51 51 51 51 51

F 23 23 23 23 22 23 23

G 14 14 17.5 17.5 23 23 23

G1 6.5 6.5 7.5 7.5 11.5 11.5 11.5

H 70 80 67 86 86 87 103.5

H1 91 100 86 104 109 110 127

H2 19 28 24 24 24 24 24

Overall H3 6 6 4 4 4.5 3.5 3.5

dimensions H4 5 5 7 7 6 5.5 5.5

L 135 135 155 155 165 165 165

L1 235 235 255 255 - 360 360

L2 117 117 136 136 144 144 144

W 76 76 90 90 105 105

W1 25 25 30 30 - - 35

W2 - 103 - 120 - - 140

W3 - - - 65 - - 75

W4 - - - - 35 - -

A 25 25 30 30 28 35 35
Mounting
B 117 117 130.5 130.5 109 126 126
dimensions Φd 4.5 4.5 4.5×6 4.5×6 3.5 5 5
 P- 102 Moulded Case Circuit Breakers NM1

Overall and mounting dimensions of NM1-400, 630, 800, 1250(Fixed type)

(mm)
NM1-400S NM1-630S
Dimension NM1-400H NM1-630H NM1-800H/R NM1-1250H
NM1-400R NM1-630R

C 128 136 136 265.5

C1 174 184.5 204 345.5
E 89 89 81 100
F 66 66 66 78
G 31 40.5 45 -
G1 12 15.5 12 -
H 107 112 116 141
H1 162 164.5 168 202
Overall H2 38 42 42 1250:56； 700A~1000A:54
dimensions H3 6 6.5 4.5 19
H4 5 3.5 5 2
H5 4.5 4.5 8 4.5
L 257 270.5 280 406*
L1 459 472 490 715
L2 224 234 243 -
W 150 182 210 210
W1 48 58 70 70
W2 198 240 280 -
A 44 58 70 70
Mounting A1 50 58 70 -
dimensions B 194 200 243 375
Φd 7 7 7 10

*Note: Lengh of NM1-1250H with the connection board, is 545mm

 NM1 Moulded Case Circuit Breakers P- 103

11. Accessories

Inner accessories

Auxiliary contact Shunt release Alarm contact Under-voltage release

Accessory code Mounting and wiring mode

NM1-63S,H
NM1-125C,S,H,R
Magnetic Compound NM1-125H,R NM1-250S,H
Accessory NM1-1250H
only release release NM1-250H,R NM1-400S,H,R
NM1-630S,H,R
NM1-800H, R

2P 3P 4P 3P

No accessory 200 300

Alarm contact 208 308

Shunt release 210 310

Auxiliary contact 220 320

Under-voltage release 230 330

Shunt release,
240 340
auxiliary contact

Shunt release,
250 350
under-voltage release

Two groups of
260 360
auxiliary contacts

Auxiliary contact,
270 370
under-voltage release

Shunt release,
218 318
alarm contact

Auxiliary
228 328
alarm contact

Under-voltage release, 238 338

auxiliary alarm contact

Shunt release, auxiliary 248 348

alarm contact

Two groups auxiliary contact 268 368

of auxiliary alarm contact

Under-voltage release 278 378

auxiliary alarm contact

Note：■ Shunt release ▲ Under-voltage release ○ Auxiliary contact ● Alarm contact

 P- 104 Moulded Case Circuit Breakers NM1

11.1 Under-voltage release

a. Un=70~35% Us, reliable operation
b. Un= ＜ 35% Us, prevent breaker from making
c. Un= ＞ 85% Us, guarantee the breaker making
The rated voltage of the under-voltage release is 50Hz,
230V and 400V.

Code of under-voltage release

code A2 A4

voltage AC 230V AC 400V

rated frequency 50Hz 50Hz

11.2 Shunt release

The rated control voltage of shunt release is 50Hz,
230V and 400V.
Un=70%~110% Us, reliable operation

Code of shunt release

code A2 A4 D3

voltage AC 230V AC 400V DC 24V

rated 50Hz/ 50Hz/

-
frequency 60Hz 60Hz

Note: when voltage is DC 24V, rated current should be up to 5A±10%

Wiring diagram of shunt release

11.3 Auxiliary contact and alarm contact

Rated parameter of auxiliary contact

Frame size Conventional heating current Ith (A) Rated current Ie (A) at AC 400 V Rated current Ie (A) at DC 230 V
Inm ≤ 250A 3 0.26 0.14
Inm ≥ 400A 6 3 0.2
 NM1 Moulded Case Circuit Breakers P- 105

a. Auxiliary contact

F12 F11
Circuit breaker is at “breaking” status
F14
F12
Circuit breaker is at “making” status F11

b. Alarm contact
F14
B
When circuit breaker normally makes and breaks, alarm contact
doesn't operate. After free release (or release due to failure)
alarm contact operate; and after the circuit breaker operates
again,alarm contact returns to the original status.

Circuit breaker is at "breaking" or B12

“making" status B11
B14
Circuit breaker is at free release B12
B11
(or alarming) status
B14

Wiring diagram of NM1 auxiliary contact

Power
Power supply
supply

Making
circuit

Breaking
circuit

External accessories

11.4 Motor-driven operation mechanism

Model
NM1-63 NM1-125, NM1-250, NM1-400, NM1-630, NM1-800, NM1-1250
Items

Structure form Motor

Code of AC/DC voltage A1/D1, A2/D2, A4

Note: A1 AC 110V, A2 AC 230V, A4 AC 400V, D1 DC 110V, D2 DC 230V

 P- 106 Moulded Case Circuit Breakers NM1

Making and breaking diagram of

motor-driven operation mechanism(AC/DC)

With self-locking relay Without self-locking relay

Specification AC 50Hz 230V or 400V Specification AC 50Hz 230V or 400V

Rotary manual operation mechanism

Making/breaking wiring diagram of manual operation mechanism

 NM1 Moulded Case Circuit Breakers P- 107

Mounting dimensions of manual operation mechanism

Boring diagram of

handle mounting

(mm)
NM1-800H NM1-1250S
Frame size NM1-63 NM1-125 NM1-250 NM1-400 NM1-630
NM1-800R NM1-1250H

Mounting
51 51 54 88 89 96 83
size H

Y value of the
handle related
to the center 0 0 0 0 0 0 0
of the breaker
 P- 108 Moulded Case Circuit Breakers NM1

Mounting and boring dimensions

(mm)

Model A B C D E F L Φd

NM1-63 25 117 80 30 80 135 182 4.5

NM1-125 30 130.5 90 30 90 155 210 4.5×6*
NM1-250 35 126 100 30 100 165 240 5.5
NM1-400 44 194 136 30 40 257 330 7
NM1-630 58 200 172 48 62 270 412 7
NM1-800 70 243 167 28 40 280 448 7

Note:
1. * stands for length of boring.
2. Install the breaker on the frame first, then install the mechanical interlock on the breaker.
 NM1 Moulded Case Circuit Breakers P- 109

12. Complementary technical information

12.1 The customized products of NM1-250, of which the capacity can be enriched to 250A is available.
12.2 NM1-1250 products are equipped with connection plate when they are sold; if you need connection plate for products of other
model, the connection plate should be ordered separately.
12.3 Only H type breaker is applicable to manufacture NM1 series switch disconnector.
12.4 Terminal covers of the whole series NM1 products are available, and the protection degree can be up to IP40 after the breaker

B
is equipped with terminal cover.
12.5 Safe distance between other electric apparatuses for mounting.

(mm)
Type
NM1-63 NM1-125 NM1-250 NM1-400 NM1-630 NM1-800 NM1-1250
Distance(min)

Line side 50 50 50 100 100 100 100

Load side 20 20 20 20 20 20 20
Right side 25 25 25 25 25 25 25
Left side 25 25 25 25 25 25 25
 P- 110 Moulded Case Circuit Breakers NM1

12.6 Tightening torque table

Wire size(copper) Rated current Tightening torque(N·m)

AWG/MCM mm2 (A) Front connection plate Boxing terminal
16-6 1.5-16 10 ≤ In ≤ 63 5 3
4-3 25-50 63 ＜ In ≤ 125 10 8
1-250 50-120 100 ＜ In ≤ 250 12 10
250-500 120-240 250 ＜ In ≤ 400 22 16
300×2 150×2 400 ＜ In ≤ 500 28 18
350×2 185×2 500 ＜ In ≤ 630 28 20
500×2 240×2 630 ＜ In ≤ 800 30 -
350×4 185×4 800 ＜ In ≤ 1250 30 -

12.7 Technical Data of NM1 series

Frame Model Number Ui (V) Icu/Ics(kA)

current (A) of poles 220V 230V 240V 380V 400V 415V 660V 690V
NM1-63S 3 500 20/10 15/7.5 -
63
NM1-63H 3/4 500 42/21 35/17.5 -
NM1-125C 3 800 25/12.5 20/10 3/1.5
NM1-125S 3 800 42/21 25/12.5 3/1.5
125
2 800 65/32.5 50/25 -
NM1-125H
3/4 800 65/32.5 50/25 8/4
NM1-125R 3 800 85/42.5 65/32.5 10/5
1 800 20/10 10/5 -
NM1-250S
3/4 800 42/21 25/12.5 5/2.5
250 3 800 85/42.5 65/32.5 -
NM1-250R
2 800 65/32.5 50/25 8/4
NM1-250H 3/4 800 65/32.5 50/25 10/5
NM1-400S 3/4 800 50/25 35/17.5 10/5
400 NM1-400H 3 800 85/42.5 50/25 12/6
NM1-400R 3 800 100/50 70/35 15/7.5
NM1-630S 3/4 800 50/25 35/17.5 12/6
630 NM1-630H 3 800 85/42.5 50/25 15/7.5
NM1-630R 3 800 100/50 70/35 20/10
NM1-800H 3/4 800 85/42.5 60/30 20/10
800
NM1-800R 3 800 100/50 70/35 20/10
1250 NM1-1250H 3 800 85/42.5 65/32.5 20/10
 NM1 Moulded Case Circuit Breakers P- 111

Frame Number Icu/Ics(kA)

Model Ui (V)
current (A) of poles 220V 230V 240V 380V 400V 415V 660V 690V

NM1-63S 3 500 20/40 15/30 -

63
NM1-63H 3/4 500 42/88.2 35/73.5 -

B
NM1-125C 3 800 25/52.5 20/40 -

NM1-125S 3 800 42/88.2 25/52.5 -

125 2 800 65/43 50/105 -
NM1-125H
3/4 800 65/43 50/105 -
NM1-125R 3 800 85/187 65/143 -

1 800 20/40 - -
NM1-250S
2/ 3/4 800 42/88.2 25/52.5 -
250
NM1-250H 2/ 3/4 800 65/136.5 50/105 -

NM1-250R 3 800 85/187 65/143 -

NM1-400S 3/4 800 50/105 35/73.5 -

400 NM1-400H 3 800 85/187 50/105 -

NM1-400R 3 800 100/220 70/154 -

NM1-630S 3/4 800 50/105 35/73.5 -

630 NM1-630H 3 800 85/187 50/105 -

NM1-630R 3 800 100/220 70/154 -

NM1-800H 3/4 800 85/187 60/132 -

800
NM1-800R 3 800 100/220 70/154 -

1250 NM1-1250H 3 800 85/187 65/143 -

Note: Parameters in black are only for your reference.

 P- 112 Moulded Case Circuit Breakers NM1

12.8 Cascading
12.8.1 Cascading (220/230/240V)
Upstream: NM1-63~1250
Downstream: DZ47, eB, UB, DZ158, DZ267, NB1, NBH8, NM1-63~1250

Upstream
NM1-63S NM1-63H NM1-125S NM1-125H NM1-125R NM1-250S NM1-250H
Breaking capacity
20 42 25 50 65 25 50
(kA RMS)

Downstream Breaking capacity (kA RMS)

DZ267 20 40 20 35 50 20 25
DZ47, eB, UB 20 40 20 35 50 20 25
NBH8 20 40 20 35 50 20 25
NB1(Icn=6000A) 20 42 25 35 50 25 35
NB1(Icn=10000A) 20 42 25 40 50 25 35
DZ158 25 40 50 25 40
NM1-63S 42 25 50 65 25 50
NM1-63H 65
NM1-125S 50 65 50
NM1-125H 65
NM1-250S 50
NM1-250H
NM1-400S
NM1-400H
NM1-630S
NM1-630H
NM1-800H
NM1-1250H

12.8.2 Cascading (380/400/415V)

Upstream: NM1-63~1250
Downstream: DZ47, eB, UB, DZ158, DZ267, NB1, NBH8, NM1-63~1250

Upstream
NM1-63S NM1-63H NM1-125S NM1-125H NM1-125R NM1-250S NM1-250H
Breaking capacity
15 35 25 50 65 25 50
(kA RMS)

Downstream Breaking capacity (kA RMS)

DZ47, eB, UB 10 15 10 15 15 10 15
NB1(Icn=6000A) 15 20 15 20 20 15 20
NB1(Icn=10000A) 15 20 20 25 25 20 25
DZ158 20 25 35 20 25
NM1-63S 35 25 50 65 25 50
NM1-63H 65
NM1-125S 50 65 50
NM1-125H 65
NM1-250S 50
NM1-250H
NM1-400S
NM1-400H
NM1-630S
NM1-630H
NM1-800H
NM1-1250H
 NM1 Moulded Case Circuit Breakers P- 113

NM1-250R NM1-400S NM1-400H NM1-400R NM1-630S NM1-630H NM1-630R NM1-800H NM1-800R NM1-1250H
65 35 50 70 35 50 70 60 70 65

B
30
30
30
35
40
50 30 40 50
65
65
65 50 70 50 70 60 70 65
65 70 70 70
65 50 70 50 70 60 70 65
65 70 70 70
50 70 50 70 60 70 65
70 70 70
50 70
70
70

NM1-250R NM1-400S NM1-400H NM1-400R NM1-630S NM1-630H NM1-630R NM1-800H NM1-800R NM1-1250H
65 35 50 70 35 50 70 60 70 65

15
20
25
35 20 25 35
65
65
65 50 70
65 70 50 70 60 70 65
65 50 70 70 70
65 70 50 70 60 70 65
50 70 70 70
70 50 70 60 70 65
70 70
50 70
70
70