CM-SRS.21P

Name: CM-SRS.21P
Brand: ABB
SKU: CM-SRS.21P

The ABB CM-SRS.21P is a single-functional current monitoring relay designed for precise over- and undercurrent protection in single-phase applications. It offers adjustable thresholds, hysteresis, and tripping delays for customizable monitoring.

Product ModelCM-SRS.21P

Material Number1SVR740840R0400

Product ID84331

Stock on Request

Last updated: 8/29/2026

Quantity

Key Features

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1. Adjustable ThresholdsSet the threshold value to match your specific monitoring needs, ensuring accurate detection of over- and undercurrents.
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2. Hysteresis ControlAdjust the hysteresis percentage to fine-tune the relay's sensitivity, reducing false triggers and enhancing reliability.
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3. Tripping DelayCustomize the tripping delay from instantaneous to 30 seconds, allowing for flexible response times based on your application requirements.
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4. Easy InstallationUtilize the easy connect technology for simple and secure wire connections, reducing installation time and effort.
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Technical Specifications

Detailed engineering parameters based on manufacturer documentation

Specifications may be subject to change without notice

Parameter

Value

Parameter

Value

Product Net Width

22.5 mm

Product Net Height

85.6 mm

Product Net Depth / Length

103.7 mm

Product Net Weight

0.141 kg

Function

Over- or undercurrent monitoring

Measuring Range

3 ... 30 mA 10 ... 100 mA 0.1 ... 1 A

5. Versatile ApplicationsSuitable for a wide range of applications, including industrial automation, building management, and electrical distribution systems, the CM-SRS.21P offers a versatile solution for current monitoring needs.

Time Range

0 s or 0.1 ... 30 s tripping delay (ON)

Rated Control Supply Voltage (Us)

24 ... 240 V AC/DC

Output

2 c/o (SPDT) contacts

Terminal Type

Screwless Terminals

Rated Operational Current AC-12 (Ie)

(230 V) 4 A

Rated Operational Current AC-15 (Ie)

(230 V) 3 A

Rated Operational Current DC-12 (Ie)

(24 V) 4 A

Rated Operational Current DC-13 (Ie)

(24 V) 2 A

Minimum Switching Capacity

24 V 10 mA

Rated Impulse Withstand Voltage (Uimp)

Measuring Circuit / Output Circuit 6 kV Output Circuit 1 / Output Circuit 2 4 kV Supply Circuit / Measuring Circuit 6 kV Supply Circuit / Output Circuit 4 kV

Rated Insulation Voltage (Ui)

Measuring Circuit / Output Circuit 600 V Output Circuit 1 / Output Circuit 2 250 V Supply Circuit / Measuring Circuit 600 V Supply Circuit / Output Circuit 250 V

Degree of Protection

Housing IP50 Terminals IP20

Overvoltage Category

III

Pollution Degree

Short-Circuit Protective Devices

Output Circuit NC - F Type Fuses 10 A Output Circuit NO - F Type Fuses 10 A

Electrical Durability

AC-12 100000 cycle

Mechanical Durability

30000000 cycle

Connecting Capacity

Flexible with Ferrule 2x 0.5 ... 1.5 mmÂ² Flexible with Insulated Ferrule 2x 0.5 ... 1.5 mmÂ² Flexible 2x 0.5 ... 1.5 mmÂ² Rigid 2x 0.5 ... 1.5 mmÂ²

Wire Stripping Length

8 mm

Mounting Position

1 ... 6

Mounting on DIN Rail

TH35-15 (35 x 15 mm Mounting Rail) acc. to IEC 60715 TH35-7.5 (35 x 7.5 mm Mounting Rail) acc. to IEC 60715

Standards

CAN/CSA C22.2 No.14 IEC/EN 63000 IEC/EN 60255-27 IEC/EN 61000-6-2 IEC/EN 61000-6-3 UL 508

Maximum Operating Voltage UL/CSA

Output Circuit 300 V AC

Contact Rating UL/CSA

B300

Connecting Capacity UL/CSA

Flexible 2x 18-16 AWG Rigid 2x 20-16 AWG

Pilot Duty UL/CSA

B300

Flammability According to UL94

V-0

Ambient Air Temperature

Operation -20 ... +60 Â°C Storage -40 ... +85 Â°C

Maximum Operating Altitude Permissible

Without Derating 2000 m

Object Classification Code

ETIM 7

EC001440 - Current monitoring relay

ETIM 8

EC001440 - Current monitoring relay

ETIM 9

EC001440 - Current monitoring relay

eClass

V11.0 : 27371802

UNSPSC

39122332

E-Number (Finland)

2712309

E-Number (Norway)

4188059

E-Number (Sweden)

3860649

Manufacturer ID

1SVR740840R0400