Data sheet

Voltage monitoring relays CM-ESS.M

For single-phase AC/DC voltages

The CM-ESS.M is an electronic voltage

monitoring relay that provides reliable monitoring
of voltages as well as detection of phase loss.
All devices are available with two different terminal
versions. You can choose between the proven
screw connection technology (double-chamber
cage connecting terminals) and the completely
tool-free Easy Connect Technology (push-in

2CDC 251 060 V0011

terminals).

Characteristics
–– Monitoring of DC and AC voltages (3-600 V)
–– TRMS measuring principle
–– One device includes 4 measuring ranges
–– Over- or undervoltage monitoring configurable
–– Open- or closed-circuit principle configurable
–– Latching function configurable Approvals
–– Hysteresis adjustable (3-30 %) A UL 508, CAN/CSA C22.2 No.14
–– Tripping delay TV adjustable (0 s; 0.1-30 s) GL
C
–– Precise adjustment by front-face operating controls
R EAC
–– Screw connection technology or
Easy Connect Technology available E CCC
–– Housing material for highest fire protection classification L RMRS
UL 94 V-0
–– Tool-free mounting on DIN rail as well as demounting
Marks
–– 2 c/o (SPDT) contacts
–– 22.5 mm (0.89 in) width
a CE
–– 3 LEDs for status indication b RCM

Order data

Voltage monitoring relays

Type Rated control supply voltage Connection technology Measuring ranges Order code
CM-ESS.MP 24-240 V AC/DC Push-in terminals 3-30 V, 6-60 V, 30-300 V, 60-600 V 1SVR740830R0500
CM-ESS.MS Screw type terminals 1SVR730830R0500

Accessories
Type Description Order code
ADP.01 Adapter for screw mounting 1SVR430029R0100
MAR.12 Marker label for devices with DIP switches 1SVR730006R0000
COV.11 Sealable transparent cover 1SVR730005R0100
 Connection technology
Maintenance free Easy Connect Technology with Approved screw connection technology with
push-in terminals double-chamber cage connecting terminals
Type designation CM-xxS.yyP Type designation CM-xxS.yyS
2CDC 253 026 F0011

2CDC 253 025 F0011

Push-in terminals Double-chamber cage connecting terminals

–– Tool-free connection of rigid and flexible wires with –– Terminal spaces for different wire sizes
wire end ferrule –– One screw for opening and closing of both cages
–– Easy connection of flexible wires without wire end –– Pozidrive screws for pan- or crosshead screwdrivers
ferrule by opening the terminals according to DIN ISO 2380-1 Form A 0.8 x 4 mm
–– No retightening necessary (0.0315 x 0.157 in), DIN ISO 8764-1 PZ1 ø 4.5 mm
–– One operation lever for opening both connecting (0.177 in)
terminals
–– For triggering the lever and disconnecting of wires
you can use the same tool (Screwdriver according to
DIN ISO 2380-1 Form A 0.8 x 4 mm (0.0315 x 0.157
in), DIN ISO 8764-1 PZ1 ø 4.5 mm (0.177 in))
–– Constant spring force on terminal point independent
of the applied wire type, wire size or ambient
conditions (e. g. vibrations or temperature changes)
–– Opening for testing the electrical contacting
–– Gas-tight

Both the Easy Connect Technology with push-in terminals and screw connection technology with double-chamber cage
connecting terminals have the same connection geometry as well as terminal position.

2 - Voltage monitoring relays CM-ESS.M | Data sheet

Functions

Operating controls

1 Adjustment of the hysteresis

2 Adjustment of the threshold value

3 Indication of operational states

U/T: LED green – control supply voltage

R: LED yellow – relay status

1
U: LED red – over- / undervoltage
2
4 Adjustment of the measuring range

5 Adjustment of the tripping delay TV

2CDC 251 052 V0011

3
6 DIP switches (see DIP switch functions)
4

Application
The multifunctional voltage monitoring relays CM-ESS.M are designed for use in single-phase AC and/or DC systems for
over- or undervoltage monitoring as well as detection of phase loss. The devices operate over an universal range of supply
voltages, provide an adjustable tripping delay and work according to the open- or closed-circuit principle.

Operating mode
The CM-ESS.2 have 2 c/o (SPDT) contacts and include 4 measuring ranges: 3-30 V, 6-60 V, 30-300 V and 60-600 V.
The units are adjusted with front-face operating controls. The selection of over- b or undercurrent monitoring a, open-
h or closed-circuit principle g and latching function ON f or OFF e is made with DIP switches. Potentiometers,
with direct reading scale, allow the adjustment of the threshold value U, the hysteresis % and the tripping delay TV. The
hysteresis % is adjustable within a range of 3 to 30 % of the threshold value and the tripping delay TV over a range of
instantaneous to a 30 s delay. Timing is displayed by a flashing green LED labelled U/T.

Data sheet | Voltage monitoring relays CM-ESS.M - 3

 Function diagrams

Overvoltage monitoring d without latching e

Open-circuit principle h
The voltage to be monitored (measured value) is applied to terminals B-C. The control supply voltage applied to terminals
A1-A2 is displayed by the glowing green LED.
If the measured value exceeds the adjusted threshold value, the tripping delay TV starts and the red LED (overvoltage)
glows. Timing of TV is displayed by the flashing W green LED. When TV is complete and the measured value still
exceeds the threshold value minus the adjusted hysteresis, the output relays energize and the yellow LED (relay energized)
glows.
If the measured value drops below the threshold value minus the adjusted hysteresis, the output relays de-energize and the
red and yellow LEDs turn off. If control supply voltage is interrupted, the green LED turns off.
Closed-circuit principle g
The voltage to be monitored (measured value) is applied to terminals B-C. When control supply voltage is applied to
terminals A1-A2, the output relays energize and the green and yellow LED (relays energized) glow.
If the measured value exceeds the adjusted threshold value, the tripping delay TV starts and the red LED glows
(overvoltage). Timing of TV is displayed by the flashing W green LED. When TV is complete and the measured value still
exceeds the threshold value minus the adjusted hysteresis, the output relays de-energize and the yellow LED turns off.
If the measured value decreases below the threshold value minus the hysteresis, the output relays re-energize, the yellow
LEDs glows and the red LED turns off. If control supply voltage is interrupted, the output relays de-energize and the green
and yellow LEDs turn off.

A1-A2

Threshold
Hysteresis
Measured value
< TV TV < TV
Open-circuit principle open

11-14 (15-18)
11-12 (15-16)
21-24 (25-28)
21-22 (25-26)
green LED
red LED
yellow LED
Closed-circuit principle closed

11-14 (15-18)
11-12 (15-16)
21-24 (25-28)
21-22 (25-26)
2CDC 252 228 F0205

green LED
red LED
yellow LED

4 - Voltage monitoring relays CM-ESS.M | Data sheet

Undervoltage monitoring c without latching e
Open-circuit principle h
The voltage to be monitored (measured value) is applied to terminals B-C. The control supply voltage applied to terminals
A1-A2 is displayed by the glowing green LED.
If the measured value decreases below the adjusted threshold value, the tripping delay TV starts and the red LED
(undervoltage) flashes W . Timing of TV is displayed by the flashing W green LED. When TV is complete and the
measured value is still below the threshold value plus the adjusted hysteresis, the output relays energize and the yellow LED
(relay energized) glows.
If the measured value exceeds the threshold value plus the adjusted hysteresis, the output relays de-energize and the red
and yellow LEDs turn off. If control supply voltage is interrupted, the green LED turns off.
Closed-circuit principle g
The voltage to be monitored (measured value) is applied to terminals B-C. When control supply voltage is applied to
terminals A1-A2, the output relays energize and the green and yellow LED (relays energized) glow.
If the measured value decreases below the adjusted threshold value, the tripping delay TV starts and the red LED flashes
W (undervoltage). Timing of TV is displayed by the flashing W green LED. When TV is complete and the
measured value is still below the threshold value plus the adjusted hysteresis, the output relays de-energize and the yellow
LED turns off.
If the measured value exceeds the threshold value plus the hysteresis, the output relays re-energize, the yellow LED glows
and the red LED turns off. If control supply voltage is interrupted, the output relays de-energize and the green and yellow
LEDs turn off.

A1-A2

Measured value
Hysteresis
Threshold

Open-circuit principle open < TV TV < TV

11-14 (15-18)
11-12 (15-16)
21-24 (25-28)
21-22 (25-26)
green LED
red LED
yellow LED
Closed-circuit principle closed

11-14 (15-18)
11-12 (15-16)
21-24 (25-28)
21-22 (25-26)
2CDC 252 229 F0205

green LED
red LED
yellow LED

Data sheet | Voltage monitoring relays CM-ESS.M - 5

 Overvoltage monitoring d with latching f
Open-circuit principle h
The voltage to be monitored (measured value) is applied to terminals B-C. The control supply voltage applied to terminals
A1-A2 is displayed by the glowing green LED.
If the measured value exceeds the adjusted threshold value, the tripping delay TV starts and the red LED glows
(overvoltage). Timing of TV is displayed by the flashing W green LED. When TV is complete and the measured
value still exceeds the threshold value minus the adjusted hysteresis, the output relays energize and the yellow LED (relay
energized) flashes Z .
If the measured value decreases below the threshold value minus the hysteresis, the red LED turns off. The output relays
remain energized (latching function). If control supply voltage is interrupted (reset), the output relays de-energize and the
green and yellow LEDs turn off.
Closed-circuit principle g
The voltage to be monitored (measured value) is applied to terminals B-C. When control supply voltage is applied to
terminals A1-A2, the output relays energize and the green and yellow LED (relays energized) glow.
If the measured value exceeds the adjusted threshold value, the tripping delay TV starts and the red LED glows
(overvoltage). Timing of TV is displayed by the flashing W green LED. When TV is complete and the measured value
still exceeds the threshold value minus the adjusted hysteresis, the output relays de-energize and the yellow LED flashes
Y.
If the measured value decreases below the threshold value minus the hysteresis, the red LED turns off. The output relays
remain de-energized (latching function). If control supply voltage is interrupted (reset), the green and yellow LEDs turn off.
The output relays energize again when control supply voltage is re-applied.

A1-A2
Reset
Threshold
Hysteresis
Measured value
< TV TV < TV
Open-circuit principle open

11-14 (15-18)
11-12 (15-16)
21-24 (25-28)
21-22 (25-26)
green LED
red LED
yellow LED
Closed-circuit principle closed

11-14 (15-18)
11-12 (15-16)
21-24 (25-28)
21-22 (25-26)
2CDC 252 230 F0205

green LED
red LED
yellow LED

6 - Voltage monitoring relays CM-ESS.M | Data sheet

Undervoltage monitoring c with latching f
Open-circuit principle h
The voltage to be monitored (measured value) is applied to terminals B-C. The control supply voltage applied to terminals
A1-A2 is displayed by the glowing green LED.
If the measured value decreases below the adjusted threshold value, the tripping delay TV starts and the red LED flashes
W (undervoltage). Timing of TV is displayed by the flashing W green LED. When TV is complete and the
measured value is still below the threshold value plus the adjusted hysteresis, the output relays energize and the yellow LED
(relays energized) flashes Z .
If the measured value exceeds the threshold value plus the hysteresis, the red LED turns off. The output relays remain
energized (latching function). If control supply voltage is interrupted (reset), the output relays de-energize and the green and
yellow LEDs turn off.
Closed-circuit principle g
The voltage to be monitored (measured value) is applied to terminals B-C. When control supply voltage is applied to
terminals A1-A2, the output relays energize and the green and yellow LED (relays energized) glow.
If the measured value decreases below the adjusted threshold value, the tripping delay TV starts and the red LED flashes
W (undervoltage). Timing of TV is displayed by the flashing W green LED. When TV is complete and the
measured value is still below the threshold value plus the adjusted hysteresis, the output relays de-energize and the yellow
LED flashes Y .
If the measured value exceeds the threshold value plus the hysteresis, the red LED turns off. The output relays remain de-
energized (latching function). If control supply voltage is interrupted (reset), the green and yellow LEDs turn off. The output
relays energize again when control supply voltage is re-applied.

A1-A2
Reset
Measured value
Hysteresis
Threshold

Open-circuit principle open < TV TV < TV

11-14 (15-18)
11-12 (15-16)
21-24 (25-28)
21-22 (25-26)
green LED
red LED
yellow LED
Closed-circuit principle closed

11-14 (15-18)
11-12 (15-16)
21-24 (25-28)
21-22 (25-26)
2CDC 252 231 F0205

green LED
red LED
yellow LED

Data sheet | Voltage monitoring relays CM-ESS.M - 7

 Electrical connection

A1 1115 2125 A1-A2 Rated control supply voltage

B B-C Measuring ranges: 3-30 V, 6-60 V, 30-300 V, 60-600 V

B 1115 2125 11 15-12 16/14 18 Output contacts - open- or closed-circuit principle

21 25-22 26/24 28

2CDC 252 207 F0005

A1 A2 1216 1418 2226 2428
1418 1216 C
2428 2226 A2

Connection diagram

DIP switches

Position 4 3 2 1 1 ON Undervoltage monitoring

2CDC 252 276 F0005

ON
closed OFF Overvoltage monitoring
V

2 ON Closed-circuit principle
OFF open V OFF Open-circuit principle
3 ON Latching function activated
OFF Latching function not activated
OFF = Default

8 - Voltage monitoring relays CM-ESS.M | Data sheet

Technical data
Data at Ta = 25 °C and rated values, unless otherwise indicated

Input circuits
Supply circuit A1-A2
Rated control supply voltage Us 24-240 V AC/DC
Rated control supply voltage Us tolerance -15...+10 %
Rated frequency 50/60 Hz
Typical current / power consumption 24 V DC 30 mA / 0.75 W
115 V AC 17 mA / 1.9 VA
230 V AC 11 mA / 2.6 VA
Power failure buffering time 20 ms
Transient overvoltage protection varistors

Measuring circuit B-C

Monitoring function over- or undervoltage monitoring configurable
Measuring method TRMS measuring principle
Measuring inputs terminal connection B-C
measuring range 3-30 V, 6-60 V, 30-300 V, 60-600 V
input resistance 600 kΩ
pulse overload capacity t < 1 s 800 V
continuous capacity 660 V
Threshold value adjustable within the indicated measuring range
Tolerance of the adjusted threshold value 10 % of the range end value
Hysteresis related to the threshold value 3-30 % adjustable
Measuring signal frequency range DC / 15 Hz - 2 kHz
Rated measuring signal frequency range DC / 50-60 Hz
Maximum response time AC 80 ms
DC 120 ms
Accuracy within the rated control supply voltage tolerance ΔU ≤ 0.5 %
Accuracy within the temperature range ΔU ≤ 0.06 % / °C
Transient overvoltage protection varistors

Timing circuit
Time delay TV 0 s or 0.1-30 s adjustable
Repeat accuracy (constant parameters) ±0.07 % of full scale
Tolerance of the adjusted time delay -
Accuracy within the rated control supply voltage tolerance Δt ≤ 0.5 %
Accuracy within the temperature range Δt ≤ 0.06 % / °C

User interface
Indication of operational states
Control supply voltage U/T: green LED V: control supply voltage applied
W: tripping delay TV active
Measured value U: red LED V: overvoltage
W: undervoltage
Relay status R: yellow LED V: output relay energized, no latching function
Z: relay energized, active latching function
Y: relay de-energized, active latching function

Data sheet | Voltage monitoring relays CM-ESS.M - 9

 Output circuits
Kind of output 11-12/14 relay, 1st c/o (SPDT) contact
21-22/24 relay, 2nd c/o (SPDT) contact
Operating principle open- or closed-circuit principle configurable (open-
circuit principle: output relays energize if the measured
value exceeds d / falls below c the adjusted
threshold value, closed-circuit principle: output relays
de-energize if measured value exeedsd / falls
below c the adjusted threshold value)
Contact material AgNi
Rated operational voltage Ue 250 V
Minimum switching voltage / Minimum switching current 24 V / 10 mA
Maximum switching voltage / Maximum switching current 250 V AC / 4 A AC
Rated operational current Ie AC-12 (resistive) at 230 V 4A
AC-15 (inductive) at 230 V 3A
DC-12 (resistive) at 24 V 4A
DC-13 (inductive) at 24 V 2A
AC rating (UL 508) utilization category (Control Circuit Rating Code) B 300
max. rated operational voltage 300 V AC
max. continuous thermal current at B 300 5A
max. making/breaking 3600/360 VA
apparent power at B 300
Mechanical lifetime 30 x 106 switching cycles
Electrical lifetime AC-12, 230 V, 4 A 0.1 x 106 switching cycles
Maximum fuse rating to achieve n/c contact 10 A fast-acting
short-circuit protection n/o contact 10 A fast-acting

General data
MTBF on request
Duty time 100 %
Dimensions (W x H x D) product dimensions 22.5 x 85.6 x 103.7 mm (0.89 x 3.37 x 4.08 in)
packaging dimensions 97 x 109 x 30 mm (3.82 x 4.29 x 1.18 in)
Weight Screw connection Easy Connect Technology
technology (Push-in)
Net weightV 0.154 kg (0.340 lb) 0.143 kg (0.315 lb)
Gross weight 0.176 kg (0.388 lb) 0.165 kg (0.364 lb)
Mounting DIN rail (IEC/EN 60715),
snap-on mounting without any tool
Mounting position any
Material of housing UL 94 V-0
Degree of protection housing IP50
terminals IP20

10 - Voltage monitoring relays CM-ESS.M | Data sheet

Electrical connection
Screw connection Easy Connect
technology Technology (Push-in)
Connecting capacity fine‑strand with(out) 1 x 0.5-2.5 mm² 2 x 0.5-1.5 mm²
wire end ferrule (1 x 18-14 AWG) (2 x 18-16 AWG)
2 x 0.5-1.5 mm²
(2 x 18-16 AWG)
rigid 1 x 0.5-4 mm² 2 x 0.5-1.5 mm²
(1 x 20-12 AWG) (2 x 20-16 AWG)
2 x 0.5-2.5 mm²
(2 x 20-14 AWG)
Stripping length 8 mm (0.32 in)
Tightening torque 0.6 - 0.8 Nm -
(7.08 lb.in)

Environmental data
Ambient temperature ranges operation -25...+60 °C (-13...+140 °F)
storage -40...+85 °C (-40...+185 °F)
Damp heat, cyclic (IEC/EN 60068-2-30) 55 °C, 6 cycles
Vibration, sinusoidal Class 2
Shock Class 2

Isolation data
Rated insulation voltage Ui supply / measuring circuit / output 600 V
output 1 / output 2 250 V
Rated impulse withstand voltage Uimp supply / measuring circuit / output 6 kV 1.2/50 μs
output 1 / output 2 4 kV 1.2/50 μs
Pollution degree 3
Overvoltage category III

Standards / Directives
Standards IEC/EN 60947-5-1, IEC/EN 60255-27, EN 50178
Low Voltage Directive 2014/35/EU
EMC Directive 2014/30/EU
RoHS Directive 2011/65/EU

Electromagnetic compatibility
Interference immunity to IEC/EN 61000-6-2
electrostatic discharge IEC/EN 61000-4-2 Level 3
radiated, radio-frequency, electromagnetic field IEC/EN 61000-4-3 Level 3
electrical fast transient / burst IEC/EN 61000-4-4 Level 3
surge IEC/EN 61000-4-5 Level 3
conducted disturbances, induced by IEC/EN 61000-4-6 Level 3
radio-frequency fields
Interference emission IEC/EN 61000-6-3
high-frequency radiated IEC/CISPR 22, EN 55022 Class B
high-frequency conducted IEC/CISPR 22, EN 55022 Class B

Data sheet | Voltage monitoring relays CM-ESS.M - 11

 Technical diagrams

Load limit curves

V V
300 300
V 200 V 200
resistive load
resistive load
100 100
80 80
60 60
50 50
40 40
30 30
20 20

2CDC 252 194 F0205

2CDC 252 193 F0205

10 10
0.1 0.2 0.5 1 2 4 6 10 0.1 0.2 0.5 1 2 4 6 10
I A I A

AC load (resistive) DC load (resistive)

1.0
Switching cycles

0.9

0.8
F
0.7 250 V
resistive load
0.6

0.5
2CDC 252 192 F0205

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
cos ϕ

2CDC 252 148 F0206

Derating factor F for inductive AC load
Switching current [A]

Contact lifetime

12 - Voltage monitoring relays CM-ESS.M | Data sheet

Dimensions
in mm and inches

113.4 4.47”
105.9 4.17” 22.5 0.89”

85.6 3.37”

2CDC 252 009 F0011

103.7 4.08”

Accessories
in mm and inches

8 0.32”
22.5 0.89” 4.8 0.19”

68 2.68”
0.453”
11.5
0.256”

62.5 2.461”
6.5

22.2
2CDC 252 008 F0010

2CDC 252 020 F0011

2CDC 252 010 F0011

0.874”
0.394”

0.787”
10

20

4T22
0.309”
7.85

front to back
60 2.362” 19.9 110.5 4.31”
70 2.756” 0.783”
ADP.01 ‑ Adapter for screw mounting MAR.12 ‑ Marker label for devices COV.11 ‑ Sealable transparent cover
with DIP switches

Further documentation
Document title Document type Document number
Electronic products and relays Technical catalogue 2CDC 110 004 C02xx
CM-ESS.M Instruction manual 1SVC 730 600 M0000

You can find the documentation on the internet at www.abb.com/lowvoltage

-> Automation, control and protection -> Electronic relays and controls -> Measuring and monitoring relays.

CAD system files

You can find the CAD files for CAD systems at http://abb-control-products.partcommunity.com
-> Low Voltage Products & Systems -> Control Products -> Electronic Relays and Controls.

Data sheet | Voltage monitoring relays CM-ESS.M - 13

Contact us

ABB STOTZ-KONTAKT GmbH

Document number 2CDC 112 173 D0201 (07/2016)

P. O. Box 10 16 80
69006 Heidelberg, Germany
Phone: +49 (0) 6221 7 01-0
Fax: +49 (0) 6221 7 01-13 25
E-mail: info.desto@de.abb.com

You can find the address of your

local sales organisation on the
ABB home page
http://www.abb.com/contacts
-> Low Voltage Products and Systems

Note:
We reserve the right to make technical changes
or modify the contents of this document without
prior notice. With regard to purchase orders, the
agreed particulars shall prevail. ABB AG does
not accept any responsibility whatsoever for
potential errors or possible lack of information in
this document.

We reserve all rights in this document and in

the subject matter and illustrations contained
therein. Any reproduction, disclosure to third
parties or utilization of its contents – in whole
or in parts – is forbidden without prior written
consent of ABB AG.

Copyright© 2016 ABB

All rights reserved