ABB CM-SFS.21S Current Monitoring Relay - CE & UL/CSA
Part Number: 1SVR730760R0400
Quick Summary
CM-SFS.21S Current monitoring relay provides precise over- and undercurrent monitoring for single-phase systems in industrial automation. Many engineers struggle with undetected current deviations causing unexpected trips and downtime. It carries CE and UL/CSA certifications and supports European and North American safety standards, with IP50 protection for rugged environments. Designed for DIN rail mounting with screw terminals, it boosts reliability and helps maintenance teams meet uptime and compliance goals in automation projects. This supports adjustable start-up and trip delays, making it adaptable to varying load profiles and ensuring selectivity in motor circuits. Integral to preventative maintenance programs, CM-SFS.21S reduces false trips and supports regulatory compliance reporting.
Product Information
Extended Description
1SVR730760R0400 ABB: The CM-SFS.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 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. The CM-SFS.21S offers window (over- and undercurrent) monitoring as well as selection of ON- or OFF-delay, open- or closed-circuit operating principle, with or without latching function. The output contacts can be configured as 1x2 c/o (SPDT) (common signal) or 2x1 c/o (SPDT) (separate signal for minimum and maximum thresholds) operation. The hysteresis is fixed at 5 % of the threshold value. The tripping delay and the start-up delay are 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.
Country of Origin
Germany (DE)
Lead Time
0 day
Made To Order
No
Warranty Return
Product under warranty must be returned
Product Sales Status
Active
Quote Only
No
Stocked At Warehouses
AETAD009EXPU
Country of Origin
Germany (DE)
Lead Time
0 day
Made To Order
No
Warranty Return
Product under warranty must be returned
Product Sales Status
Active
Quote Only
No
Stocked At Warehouses
BRABB008EXPU
Country of Origin
Germany (DE)
Lead Time
0 day
Made To Order
No
Warranty Return
Product under warranty must be returned
Product Sales Status
Active
Quote Only
No
Stocked At Warehouses
CHSEC006EXPU
Lead Time
160 day
Warranty Return
Product under warranty must be returned
Stocked At Warehouses
CZABB004EXPU
Country of Origin
Germany (DE)
Made To Order
No
Product Sales Status
Active
Quote Only
No
Country of Origin
Germany (DE)
Lead Time
21 day
Made To Order
No
Product Sales Status
Active
Quote Only
No
Stocked At Warehouses
CZABB006EXPU
Warranty Return
Product under warranty must be returned
EAN
4016779852135
Minimum Order Quantity
1 piece
Customs Tariff Number
85364900
Data Sheet, Technical Information
Data sheet - CM-SFS.2P; CM-SFS.2S Current window monitoring relay, 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
0.15 kg
Function
Over- and undercurrent monitoring
Measuring Range
3 ... 30 mA | 10 ... 100 mA | 0.1 ... 1 A
Time Range
0 s or 0.1 ... 30 s start-up delay | 0 s or 0.1 ... 30 s tripping delay (ON or OFF)
Rated Control Supply Voltage (Us)
24 ... 240 V AC/DC
Output
2 x 1 c/o or 1 x 2 c/o contacts; operating principle selectable
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 6 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
Ambient Air Temperature
Operation -20 ... +60 °C | Storage -40 ... +85 °C
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
0.173 kg
Package Level 1 EAN
4016779852135
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)
2712298
E-Number (Norway)
4188074
E-Number (Sweden)
3860616
Wide control supply voltage 24-240 V AC/DC ensures plug-and-play compatibility across different equipment and regions. This reduces panel engineering time and spare-part diversity, while enabling uniform control of relays and monitoring devices. It is well suited for single-phase automation panels, machine guards, and line protection circuits in manufacturing environments. Three measurement ranges—3-30 mA, 10-100 mA, and 0.1-1 A—use RMS sensing to deliver accurate thresholds for both DC and AC loads. Combined with window monitoring, this enables precise over- and undercurrent detection and reduces nuisance trips. Typical applications include motor protection, heating control, and process lines with variable load profiles. Output can be configured as 2 SPDT or a single 1 x 2 SPDT, with selectable operating principle and a fixed 5% hysteresis. Tripping and start-up delays are adjustable from instantaneous to 0-30 s, and a latch option adds safety interlocks. These features simplify PLC wiring and improve safety logic in control panels and machine safeguarding. Delays, protection, and accessories: A sealable transparent cover is available to prevent unauthorized changes, supporting compliance audits. The minimum switching capacity (24 V at 10 mA) and robust contacts provide predictable behavior in demanding environments, reducing unplanned downtime and maintenance costs. Ruggedness and installation compatibility: IP50 housing with IP20 terminals, screw-terminal connections, and DIN-rail mounting compatibility (TH35-15 or TH35-7.5) make it suitable for harsh industrial environments. Broad certifications including CE, UL/CSA, CCC, and RoHS simplify regulatory compliance and supplier qualification, easing procurement for multi-site rollouts.
Get a Quick Quote for a ABB 1SVR730760R0400
Chat with us on WhatsApp - fast responses guaranteed
Need to speak with someone? We'll call you back within 2 hours during business hours
Interested in ABB 1SVR730760R0400?
Enquire Now
FAQs
Install CM-SFS.21S on a TH35 DIN rail (TH35-15 or TH35-7.5). Wire the supply to 24-240 V AC/DC using the screw terminals and connect the two SPDT outputs to the control circuit. Use 0.5–2.5 mm² conductors, tighten to 0.6–0.8 N·m, and strip 8 mm. Confirm delays and, if needed, enable optional latch for safety interlocks.
CM-SFS.21S provides RMS-based current measurement in three ranges: 3-30 mA, 10-100 mA, and 0.1-1 A. This enables accurate window monitoring for both DC and AC loads, reducing mis-tripping. Select the range to balance sensitivity and stability for motor protection, heaters, and process lines with variable loads.
Yes. The device monitors current, signals via SPDT outputs, and supports adjustable start-up and tripping delays, making it suitable for motor protection and interlock signaling in single-phase systems. It helps prevent motor burnout and reduces downtime by delivering reliable, configured protection aligned with your start-up profiles.
CM-SFS.21S carries CE and UL/CSA certifications, along with other approvals (cULus, CCC, UKCA). These align with IEC and UL standards, supporting European and North American compliance for control panels, reducing supplier qualification effort and ensuring safe integration into regulated environments.
The device reduces nuisance trips and unplanned downtime through precise current monitoring and configurable delays, improving uptime and maintenance planning. Fewer trips cut labor costs, while standardized signaling simplifies wiring and panel commissioning. Across multiple sites, this delivers measurable savings in energy waste, spare parts, and regulatory compliance effort.