ABB CM-SRS.21S Current Monitoring Relay - 2c/o SPDT
Part Number: 1SVR730841R1400
Quick Summary
ABB CM-SRS.21S current monitoring relay guards single-phase circuits in automation panels by monitoring current levels. Engineers often face nuisance trips and undetected overloads that disrupt production and maintenance planning. This device carries CE, UL/CSA, and CB certifications and IP50 housing, supporting safe, compliant operation in harsh environments. By combining DIN rail mounting with screw-terminal wiring, it delivers quick installation, reliable protection, and scalable integration for control cabinets and machine panels.
Product Information
Extended Description
1SVR730841R1400 ABB: The CM-SRS.21S is a single-functional current monitoring relay from the CM single-phase monitors range. This monitoring relay operates with a rated control supply voltage of 220 - 240 V AC and has a 2 c/o (SPDT) output with contacts rated at 250 V / 4 A. It provides a RMS measuring principle for DC and AC currents with 3 measuring ranges: 3-30 mA, 10-100 mA and 0.1-1 A and works according to the open-circuit principle. The CM-SRS.21S is configurable for over- or undercurrent monitoring. The hysteresis is adjustable within a range of 3 to 30 % of the threshold value and the tripping delay is adjustable over a range of instantaneous to 30 s (0, 0.1-30 s). A sealable transparent cover for protection against unauthorized changes is available as accessory. The device offers screw connection technology with double-chamber cage connection terminals.
EAN
4016779852340
Minimum Order Quantity
1 piece
Customs Tariff Number
85364900
Data Sheet, Technical Information
Data sheet - CM-SRS.2P; CM-SRS.2S Current monitoring relays, single-phase AC/DC
Instructions and Manuals
Instruction Sheet / Manual - CM-SxS Single-phase current monitoring relays | Installation instructions - CM-SxS Single-phase current monitoring relays
CAD Dimensional Drawing
Information - 2D and 3D files for CAD systems
Product Net Width
22.5 mm
Product Net Height
85.6 mm
Product Net Depth / Length
103.7 mm
Product Net Weight
0.179 kg
Function
Over- or undercurrent monitoring
Measuring Range
3 ... 30 mA | 10 ... 100 mA | 0.1 ... 1 A
Time Range
0 s or 0.1 ... 30 s tripping delay (ON)
Rated Control Supply Voltage (Us)
220 ... 240 V AC
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
3
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
Nr. Operations 30000000 cycle
Connecting Capacity
Flexible with Ferrule 1x 0.5 ... 2.5 mm² | Flexible with Ferrule 2x 0.5 ... 1.5 mm² | Flexible with Insulated Ferrule 1x 0.5 ... 2.5 mm² | Flexible with Insulated Ferrule 2x 0.5 ... 1.5 mm² | Flexible 1x 0.5 ... 2.5 mm² | Flexible 2x 0.5 ... 1.5 mm² | Rigid 1x 0.5 ... 4 mm² | Rigid 2x 0.5 ... 2.5 mm²
Tightening Torque
0.6 ... 0.8 N·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 in·lb
Pilot Duty UL/CSA
B300
Flammability According to UL94
V-0
Ambient Air Temperature
Operation -20 ... +60 °C | Storage -40 ... +85 °C
Maximum Operating Altitude Permissible
Without Derating 2000 m
Conflict Minerals Reporting Template (CMRT)
CMRT - Conflict Minerals Reporting Template
REACH Declaration
REACh Info for Electronic Relays and Controls
RoHS Information
RoHS Declaration of conformity for Electronic Relays and Controls
RoHS Status
Following EU Directive 2011/65/EU and Amendment 2015/863 July 22, 2019
Toxic Substances Control Act - TSCA
Toxic Substances Control Act (TSCA) declaration for Electronic Relays and Controls
CB Certificate
CB_DK-28255-UL
CQC Certificate
CQC Certificate, Relays, CM-SRS.., CM-SFS.., CM-ESS..,CM-EFS.., CM-TCS.., Made in Germany
cULus Certificate
cULus508_20120203-E140448
Declaration of Conformity - CCC
CCC Certificate, Relays, CM-SRS.., CM-SFS.., CM-ESS..,CM-EFS.., CM-TCS.., Made in Germany
Declaration of Conformity - CE
EU Declaration of Conformity - CM-ExS.xxx, CM-SxS.xxx Single-phase current and voltage monitoring relays
Declaration of Conformity - UKCA
UK Declaration of Conformity - CM-ExS.xxx, CM-SxS.xxx Single-phase current and voltage monitoring relays
DNV GL Certificate
DNV Certificate - Current monitoring relays CM-SFS.x and CM-SRS.x with screw or push-in terminals
EAC Certificate
EAC Certificate - Measuring and monitoring relays CM-xxS.xxx and CM-xxN.xxx range in the new housing
Package Level 1 Units
box 1 piece
Package Level 1 Width
97 mm
Package Level 1 Depth / Length
30 mm
Package Level 1 Height
109 mm
Package Level 1 Gross Weight
0.201 kg
Package Level 1 EAN
4016779852340
Object Classification Code
B
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)
2712314
E-Number (Norway)
4188062
E-Number (Sweden)
3860637
Feature: Three measuring ranges (3-30 mA, 10-100 mA, 0.1-1 A) using RMS measurement. Benefit: Enables precise protection across a broad current spectrum, reducing false trips and safeguarding motors and loads in any single-phase circuit. Application: Ideal for machine control panels and pump protection where current surges vary with load. Feature: Open-circuit principle with adjustable hysteresis (3–30% of threshold). Benefit: Improves selectivity and reduces chatter in systems with fluctuating loads, boosting reliability and uptime. Application: Critical in conveyor drives and CNC machines where stable trip thresholds are essential. Feature: Tripping delay adjustable from instantaneous to 0.1–30 s. Benefit: Balances protection and process continuity, minimizing unnecessary shutdowns while still catching fault conditions. Application: Common in automated manufacturing lines and packaging equipment. Feature: 2 c/o SPDT contacts plus screw terminals for robust wiring. Benefit: Simplifies wiring schemes and allows flexible logic control without additional relays. Application: Fits standard control schemes in ABB-compatible panels and DIN rail installations. Feature: Control supply 220–240 V AC with DIN rail mounting TH35 compatibility. Benefit: Streamlines panel design, reduces mounting footprint, and supports quick retrofit in existing cabinets. Application: Broad industrial use in automation and control systems with standardized rail mounting. Feature: IP50 housing and 600 V insulation in the measuring and output circuits. Benefit: Provides protection against dust and enhances safety in factory environments. Application: Suitable for harsh production floors and cabinet interiors where reliability is critical. Feature: Compliance and durability references – UL/CSA, CE declarations, CAN/CSA, and extensive testing (AC-12 durability, mechanical cycles). Benefit: Assures regulatory compliance, long service life, and predictable maintenance windows. Application: Critical for regulated industries and long-term asset management.
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FAQs
Yes. The CM-SRS.21S is designed for DIN rail mounting on TH35-15 or TH35-7.5 rails and uses screw terminals for robust, vibration-resistant connections. This simplifies retrofits and new installs, enabling quick panel integration with existing control architectures.
The unit provides three RMS measuring ranges: 3-30 mA, 10-100 mA, and 0.1-1 A. It operates from 220-240 V AC, with 2 SPDT outputs. This combination supports precise current monitoring across common single-phase loads in industrial environments.
Yes. With adjustable hysteresis (3-30%), a selectable tripping delay (0 s to 0.1-30 s), and SPDT outputs, it suits motor protection in packaging lines where current spikes and short interruptions can impact line throughput. The open-circuit measuring principle adds reliability for fluctuating loads typical in packaging machinery.
The CM-SRS.21S aligns with CE, UL/CSA, CB declarations, and EN/IEC standards listed in the datasheet. It features IP50 housing, 600 V insulation ratings between circuits, and robust testability to meet industrial safety requirements, reducing compliance risk in regulated facilities.
Maintenance is minimized by durable AC-12 operation up to 100,000 cycles and robust mechanical durability. Its compact DIN-rail form factor simplifies cabling and future upgrades, reducing down-time during replacements. The combination of reliable protection, quick installation, and standard wiring typically lowers unplanned outages and extends panel life.