Thermal Overload Relays

Tripping Class 20

New
Motor Protection — general Tripping classes of the thermal overload relays
It is very important to choose an adequate protective device for Standard tripping classes are 10 A, 10, 20, 30. The tripping
the safety of the motor during operation and for its durability. class indicates according to IEC 60947-4-1 the maximum
The efficiency of protection methods varies according to the ap- tripping time in seconds under specified conditions of test at
plication. The overview below will help you to choose. 7.2 times the setting current and specifics tripping and non trip-
There is no general rule and we are available to advise you for ping times for 1.5 and 7.2 times the setting current.
special applications and especially in the case of difficult start-
ing. An economic and effective protection are thermal overload Construction and function
relays with protection against: • General
> Overload Thermal O/L relays and their accessories meet UL, NEMA, CSA
> Phase failure imbalance and most other important international standards (IEC), European
> Phase loss standards (EN) and the most important national standards. They
meet the certification and approval directives required through-
Description out the world.
• Available for starter construction with A Line contactors and Thermal overload relays are 3 pole. The motor current flows
separate panel mounting through their bimetals (1 per phase) which are indirectly heated.
• Designed for close couple mounting – separate base Under the effect of the heating, the bimetals bend, cause the
mounting available for all overload relays relay to trip and the position of the auxiliary contacts to change.
• Full automatic function, Manual reset, Test phase or Reset The relay setting range is graduated in amps. In compliance with
can also be adjusted to function as a stop button international and national standards, the setting current is the
• Remote trip and reset option available motor nominal current and not the tripping current (no tripping
• Screwdriver guide holes, all terminal screws are available at 1.05 x setting current, tripping at 1.2 x setting current). The
from the front tripping curves (cold or warm starting, 3 phases and 2 phases)
• Trip indication are shown in the main catalog.
• Ambient compensation -25 °C to +55 °C The relays are built to be self protecting in the event of an over-
(-13 °F to +131 °F) load until the short circuit protection device is activated.

Function of the thermal overload relays

Press Contacts Relay tripped Relay not tripped
blue button Manual Automatic Manual Automatic
Terminals
L1, L3, L5
NC 95-96 open open closed closed
Manual test NO 97-98 closed closed open open
Button R Reset – – –
Manual or NC 95-96 closes when – – –
automatic reset Button‘s
Frame size pressed
TA ... DU Trip indication light
NO 97-98 opens when – – –
Reset button Button‘s
Amp setting pressed
range
Button R/O Reset – – –
Tripping contact
(95,96) NC 95-96 closes when – opens when opens when
Button‘s Button‘s Button‘s
released pressed pressed
Signaling Terminals closes when closes when
contact (97, 98) T1, T2, T3
Button‘s Button‘s
released released
NO 97-98 opens when – – –
Button‘s
pressed
 Thermal Overload Relays with Trip Class 20
Ordering data for the "New additional Assortment"

Ordering Details Order code Setting range UL Packing List

A…A Fuse/ unit Price
Type 600V/K5 piece
A
TA25DU trip class 20 for contactors A9 … A40 and (T) AL9 … (T) AL30
TA25DU1.8-20 1SAZ211401R1025 1.3 … 1.8 6 1
TA25DU2.4-20 1SAZ211401R1028 1.7 … 2.4 10 1
TA25DU3.1-20 1SAZ211401R1031 2.2 … 3.1 10 1
TA25DU4.0-20 1SAZ211401R1033 2.8 … 4.0 15 1
TA25DU5.0-20 1SAZ211401R1035 3.5 … 5.0 20 1
TA25DU6.5-20 1SAZ211401R1038 4.5 … 6.5 25 1
$ 63
TA25DU8.5-20 1SAZ211401R1040 6.0 … 8.5 35 1
TA25DU11-20 1SAZ211401R1043 7.5 … 11 45 1
TA25DU14-20 1SAZ211401R1045 10 … 14 60 1
TA25DU
TA25DU19-20 1SAZ211401R1047 13 … 19 60 1
TA25DU25-20 1SAZ211401R1051 18 … 25 70 1
TA25DU32-20 (1) 1SAZ211401R1053 24 … 32 (1) 100 1
(1)
with terminal block DX25: 1x16mm2

TA42DU trip class 20 for contactors A30, A40 and (T) AL30, (T) AL40
TA42DU25-20 1SAZ311401R1001 18 … 25 80 1
TA42DU32-20 1SAZ311401R1002 22 …32 100 1 $ 78
TA42DU42-20 1SAZ311401R1003 29 … 42 150 1

TA42DU

TA75DU trip class 20 for contactors A50 … A75 and AE50 … AE75
TA75DU25-20 1SAZ321401R1001 18 … 25 80 1
TA75DU32-20 1SAZ321401R1002 22 … 32 100 1
TA75DU42-20 1SAZ321401R1003 29 … 42 150 1
$ 102
TA75DU52-20 1SAZ321401R1004 36 … 52 175 1
TA75DU63-20 1SAZ321401R1005 45 … 63 200 1
TA75DU80-20 1SAZ321401R1006 60 … 80 250 1
TA75DU

TA80DU trip class 20 for contactors A95, A110, AE 95 and AE110

TA80DU42-20 1SAZ331401R1003 29 … 42 150 1
TA80DU52-20 1SAZ331401R1004 36 … 52 175 1
$ 135
TA80DU63-20 1SAZ331401R1005 45 … 63 200 1
TA80DU80-20 1SAZ331401R1006 60 … 80 250 1

No Tripping at 1.05 Ie
Tripping at 1.2 Ie within 2 hours
TA80DU Time

Class 30 9 - 30 sec

Class 20 6 - 20 sec

Class 10 4 - 10 sec

Ie (adjusted current)
1.2 Ie 7.2 Ie
 Thermal Overload Relays with Trip Class 20
Resistances and power losses per phase
Short-circuit protection
Setting range Short-circuit protection (fuses) UL UL Resistance Power loss
Type „2“ Type „1“ per phase per phase
co-ordination co-ordination
Fuse/600V 600V at upper
from … to gL/gG gL/gG K5 CB current setting
A A A A A A mOhm W

Thermal overload relay TA25DU trip class 20

1.3 … 1.8 10 25 6 - 670.3 2.2
1.7 … 2.4 16 25 10 - 381 2.2
2.2 … 3.1 16 25 10 - 235.3 2.3
2.8 … 4.0 20 25 15 - 140.7 2.3
3.5 … 5.0 25 25 20 - 91.2 2.3
4.5 … 6.5 25 25 25 - 54.5 2.3
6.0 … 8.5 32 32 35 - 32.1 2.3
7.5 … 11 40 40 45 - 15.5 1.9
10 … 14 50 50 60 - 12 2.4
13 … 19 63 63 60 - 6.3 2.3
18 … 25 80 80 70 - 4.7 3.0
24 … 32 100 100 100 - 3.2 3.3

Thermal overload relay TA42DU trip class 20

18 … 25 100 160 80 80 5.5 3.43
22 … 32 125 160 100 80 2.89 2.91
29 … 42 160 160 150 80 1.84 3.24

Thermal overload relay TA75DU trip class 20

18 …25 100 160 80 80 5.5 3.43
22 … 32 125 160 100 80 2.89 2.91
29 …42 160 160 150 80 1.84 3.24
36 … 52 200 200 175 125 1.3 3.51
45 … 63 200 250 200 125 0.936 3.72
60 … 80 250 250 250 125 0.615 3.94

Thermal overload relay TA80DU trip class 20

29 … 42 160 160 150 80 1.84 3.24
36 … 52 200 200 175 125 1.3 3.51
45 … 63 200 250 200 125 0.936 3.72
60 … 80 250 250 250 150 0.615 3.94

Type „1“ co-ordination according to IEC 60947-4-1: Under short-circuit conditions, the starter shall cause no danger to persons or
installation and may not be suitable for further service without repair and replacement of parts.

Type „2“ co-ordination according to IEC 60947-4-1: Under short-circuit conditions, the contactor or starter shall cause no danger
to persons or installation and shall be suitable for further use. The risk of contact welding is recognized, in which case the manu-
facturer shall indicate the measures to be taken as regards the maintenance of the equipment

Standard technical data, operating data and dimensions see TA...Relay Main Catalog
 Thermal Overload Relays with Trip Class 20
Technical data
Short-circuit ratings
Voltage Type Setting range 5 kA 10 kA 18 kA
480 V A…A Fuse K5 CB Fuse K5 CB Fuse K5 CB

TA25DU TA25DU-1.8-20 1.3 … 1.8 6 - 6 - 6 -

TA25DU-2.4-20 1.7 … 2.4 10 - 10 - 10 -
TA25DU-3.1-20 2.2 … 3.1 10 - 10 - 10 -
TA25DU-4.0-20 2.8 … 4.0 15 - 15 - 15 -
TA25DU-5.0-20 3.5 … 5.0 20 - 20 - 20 -
TA25DU-6.5-20 4.5 … 6.5 25 - 25 - 25 -
TA25DU-8.5-20 6.0 … 8.5 35 - 35 - 35 -
TA25DU-11-20 7.5 … 11 45 - 45 - 45 -
TA25DU-14-20 10 … 14 60 - 60 - 60 -
TA25DU-19-20 13 … 19 60 - 60 - 60 -
TA25DU-25-20 18 … 25 70 - 70 - 70 -
TA25DU-32-20 24 … 32 100 - 100 - 100 -
TA42DU TA42DU-25-20 18 … 25 80 80 80 - 150 -
TA42DU-32-20 22 …32 100 80 100 - 150 -
TA42DU-42-20 29 … 42 150 80 150 - 200 -
TA75DU TA75DU-25-20 18 … 25 80 80 80 - 150 -
TA75DU-32-20 22 … 32 100 80 100 - 150 -
TA75DU-42-20 29 … 42 150 80 150 - 200 -
TA75DU-52-20 36 … 52 175 125 175 - 250 -
TA75DU-63-20 45 … 63 200 125 200 - 250 -
TA75DU-80-20 60 … 80 250 125 250 - 250 -
TA80DU TA80DU-42-20 29 … 42 150 80 150 - 150 -
TA80DU-52-20 36 … 52 175 125 175 - 175 -
TA80DU-63-20 45 … 63 200 125 200 - 250 -
TA80DU-80-20 60 … 80 250 150 250 - 250 -

Voltage Type Setting range 5 kA 10 kA 18 kA

600 V A…A Fuse K5 CB Fuse K5 CB Fuse K5 CB

TA25DU TA25DU-1.8-20 1.3 … 1.8 6 - 6 - 6 -

TA25DU-2.4-20 1.7 … 2.4 10 - 10 - 10 -
TA25DU-3.1-20 2.2 … 3.1 10 - 10 - 10 -
TA25DU-4.0-20 2.8 … 4.0 15 - 15 - 15 -
TA25DU-5.0-20 3.5 … 5.0 20 - 20 - 20 -
TA25DU-6.5-20 4.5 … 6.5 25 - 25 - 25 -
TA25DU-8.5-20 6.0 … 8.5 35 - 35 - 35 -
TA25DU-11-20 7.5 … 11 45 - 45 - 45 -
TA25DU-14-20 10 … 14 60 - 60 - 60 -
TA25DU-19-20 13 … 19 60 - 60 - 60 -
TA25DU-25-20 18 … 25 70 - 70 - 70 -
TA25DU-32-20 24 … 32 100 - 100 - 100 -
TA42DU TA42DU-25-20 18 … 25 80 80 80 - 150 -
TA42DU-32-20 22 …32 100 80 100 - 150 -
TA42DU-42-20 29 … 42 150 80 150 - 200 -
TA75DU TA75DU-25-20 18 … 25 80 80 80 - 150 -
TA75DU-32-20 22 … 32 100 80 100 - 150 -
TA75DU-42-20 29 … 42 150 80 150 - 150 -
TA75DU-52-20 36 … 52 175 125 175 - 175 -
TA75DU-63-20 45 … 63 200 125 200 - 250 -
TA75DU-80-20 60 … 80 250 125 250 - 250 -
TA80DU TA80DU-42-20 29 … 42 150 80 150 - 150 -
TA80DU-52-20 36 … 52 175 125 175 - 175 -
TA80DU-63-20 45 … 63 200 125 200 - 250 -
TA80DU-80-20 60 … 80 250 150 250 - 250 -
 Thermal Overload Relays with Trip Class 20
Table for tripping time

Tripping times of thermal overload relays as a function of a multiple of the setting current from cold state
(tolerance +/- 20% of the tripping time).

Setting range Tripping times of thermal overload relays:

at multiple of setting current
3 4 5 6 7.2 8
from … to
A A Tripping times in sec

Thermal overload relays TA25DU trip class 20

1.3 … 1.8 47.1 27 20.3 15.8 12.7 11.5
1.7 … 2.4 43.3 25 18.9 14.4 11.9 10.4
2.2 … 3.1 47.5 28 20.8 16 13.1 11.8
2.8 … 4.0 45.6 27 19.8 15.3 12.5 11
3.5 … 5.0 47.8 29 21.2 16 13.2 11.8
4.5 … 6.5 47.4 28 20.3 15.5 12.5 11
6.0 … 8.5 46.1 27 20 15 11.7 10
7.5 … 11 42.3 25 17.8 14.1 10.9 10.5
10 … 14 39.4 25 16.8 13 9.9 8.5
13 … 19 38.1 21 13.6 10 7.4 6.2
18 … 25 44.4 25 16.1 11 9 8
24 … 32 44.4 27 17.7 13 9.8 8.5

Thermal overload relays TA42DU, TA75DU, TA80DU trip class 20

18 … 25 51.6 29 20.3 15 11.7 10
22 … 32 67.9 38 26.9 20 14.8 12.5
29 … 42 58.8 33 22.5 16 12.2 10.3
36 ... 52 59.9 34 22.7 16 12.3 10.5
45 ... 63 65.8 34 22.4 16 12.4 10.5
60 ... 80 71.9 35 23.4 17 13.9 12

Printed in USA, November, 2005

No. 1SXU 106 043 B0201
Publication LV043

ABB Inc. ABB Inc.

1206 Hatton Road 3299, J.B. Deschamps
Wichita Falls, TX 76302 Lachine, QC H8T 3E4
Telephone 888-385-1221; 940-397-7000 Canada
Fax 940-397-7085 Telephone: 800-567-0283 (Quebec)
http://www.abb-control.com 866-460-3300 (Ontario)
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