CM-SRS.21S

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

Monitor single-phase mains with the ABB CM-SRS.21S current monitoring relay. Adjustable thresholds, hysteresis, and tripping delay ensure precise control for over- and undercurrent protection.

Product ModelCM-SRS.21S

Material Number1SVR730840R0400

Product ID83616

Stock on Request

Last updated: 8/29/2026

Quantity

Key Features

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1. Precise MonitoringThe CM-SRS.21S offers adjustable thresholds, hysteresis, and tripping delay, ensuring precise control over current monitoring.
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2. Versatile ApplicationsSuitable for a wide range of applications, including industrial, commercial, and residential settings, this relay provides reliable protection against over- and undercurrents.
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3. Easy InstallationWith its DIN rail mounting and easy connect technology, the CM-SRS.21S is simple to install and integrate into existing electrical systems.
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4. High ReliabilityBuilt with high-quality components, the CM-SRS.21S ensures reliable operation over a wide temperature range (-20°C to +60°C), making it a durable choice for demanding environments.

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

0.152 kg

Function

Over- or undercurrent monitoring

Measuring Range

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

5. Customizable SettingsThe relay allows for customization through front-face operating controls, including the selection of over- or undercurrent monitoring and adjustment of threshold values and hysteresis percentages.

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

Screw 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 1x 0.5 ... 2.5 mmÂ² Flexible with Ferrule 2x 0.5 ... 1.5 mmÂ² Flexible with Insulated Ferrule 1x 0.5 ... 2.5 mmÂ² Flexible with Insulated Ferrule 2x 0.5 ... 1.5 mmÂ² Flexible 1x 0.5 ... 2.5 mmÂ² Flexible 2x 0.5 ... 1.5 mmÂ² Rigid 1x 0.5 ... 4 mmÂ² Rigid 2x 0.5 ... 2.5 mmÂ²

Tightening Torque

0.6 ... 0.8 NÂ·m

Wire Stripping Length

8 mm

Recommended Screw Driver

0.8 x 4 4.5 Pozidriv 1

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 1x 18-14 AWG Flexible 2x 18-16 AWG Rigid 1x 20-12 AWG Rigid 2x 20-14 AWG

Tightening Torque UL/CSA

7.08 inÂ·lb

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)

2712312

E-Number (Norway)

4188058

E-Number (Sweden)

3860627

Manufacturer ID

1SVR730840R0400