ABB 1SVR740840R0400 Current Monitoring Relay - CE
Part Number: 1SVR740840R0400
Quick Summary
The ABB CM-SRS.21P current monitoring relay is a precise single‑phase protection device for industrial automation. It performs over- or undercurrent monitoring with a 24‑240 V AC/DC supply, guarding motors, sensors and control circuits from nuisance trips. This relay carries CE, UL/CSA, cULus and CCC declarations, RoHS compliance, and IP50 housing, making it suitable for demanding factory environments. It supports Easy Connect technology for fast wiring and DIN-rail mounting, streamlining panel builds. By enabling configurable thresholds, hysteresis, and trip delay, it delivers consistent protection while reducing downtime and maintenance costs across multiple machines and lines.
Product Information
Extended Description
1SVR740840R0400 ABB: The CM-SRS.21P 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 24 - 240 V AC / DC 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.21P 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 maintenance free Easy Connect Technology with push-in terminals.
EAN
4016779852487
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
0.141 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)
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
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 2x 0.5 ... 1.5 mm² | Flexible with Insulated Ferrule 2x 0.5 ... 1.5 mm² | Flexible 2x 0.5 ... 1.5 mm² | Rigid 2x 0.5 ... 1.5 mm²
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 °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
0.163 kg
Package Level 1 EAN
4016779852487
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)
2712309
E-Number (Norway)
4188059
E-Number (Sweden)
3860649
Feature: Wide control supply voltage of 24-240 V AC/DC. Business Impact: Simplifies installation across machines with a single device type, reducing spare parts and inventory complexity. Application: Panel retrofits and new machine builds benefit from flexible power sourcing. The device’s compatibility with DIN-rail mounting and screwless terminals speeds up commissioning and reduces wiring faults. Feature: Three measuring ranges (3-30 mA, 10-100 mA, 0.1-1 A). Business Impact: Protects a wide variety of loads without swapping relays, lowering total cost of ownership. Application: Motors, solenoids, and sensing loads across automation lines. Feature: Open-circuit measuring principle with adjustable hysteresis (3-30%) and trip delay (0–30 s). Business Impact: Minimizes nuisance trips and improves reliability by tailoring response to each load profile. Application: Sensitive control circuits and critical equipment circuits. Feature: 2 c/o SPDT outputs rated at 4 A, with flexible NC/NO potential. Business Impact: Enables versatile logic and interlocking without additional relays. Application: Safety interlocks, motor cutoffs, and status signaling. Feature: Easy Connect push-in terminals. Business Impact: Faster installation, fewer tool-dependent connections, and robust maintenance-free wiring. Application: Panel builders and service teams. Feature: Robust environmental and electrical specs (IP50 housing, 6 kV impulse across circuits, 600 V insulation). Business Impact: Reliable operation in harsh factory environments, reducing field failures. Application: High-vibration or dusty environments. Feature: DIN-rail mounting (TH35), 1–6 mounting positions. Business Impact: Flexible placement within control cabinets and easy retrofit. Application: Standardized installation in panel systems.
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FAQs
Installation is straightforward with standard TH35 DIN rails. The CM-SRS.21P features screwless push-in terminals for fast, secure connections and supports 24-240 V AC/DC. Mount it on a standard 35x7.5 or 35x15 mm rail and use 2x 0.5–1.5 mm² conductors. Ensure proper clearance and tighten terminals to the recommended torque to maintain IP50 protection.
The device monitors DC and AC currents using three measuring ranges: 3-30 mA, 10-100 mA, and 0.1-1 A. This allows precise protection for a wide spectrum of loads—from small solenoids to motor starters—while mitigating nuisance trips and maintaining robust protection.
CM-SRS.21P carries CE, UL/CSA, cULus and CCC declarations, RoHS compliance, and EAC/CB listings. It conforms to IEC/EN 61000 series standards for electrical robustness and meets IP50 enclosure protection, making it suitable for industrial control panels and equipment.
Yes. It provides over- and undercurrent monitoring with adjustable thresholds and trip delay, SPDT outputs for control logic, and 24-240 V supply compatibility. Its design supports reliable motor protection in panels, reducing downtime and enabling safer, more predictable operation of drives and feeders.
Hysteresis can be set from 3% to 30% of the threshold and the trip delay from instantaneous to 30 seconds. This flexibility minimizes nuisance trips while preserving protective sensitivity. The result is lower maintenance costs, fewer false trips, and improved mean time between failures for critical equipment.