ABB Data Sheet - CM-SFS.2P; CM-SFS.2S Current Window Monitoring Relay, Single-Phase AC DC
Summary
Monitor your single-phase AC or DC mains safety with this advanced electronic current monitoring relay. Engineered for reliability, it precisely monitors over- and undercurrent conditions across adjustable ranges (3 mA to 15 A). This manual details its flexible configurations, including both tool-free push-in and robust screw connection technologies. Ideal for industrial electrical engineers and maintenance personnel requiring customizable safety controls, the relay features configurable trip delays, start-up delays, and both open/closed circuit options for comprehensive protection systems.
Page 1 Text Content
Data sheet
Current monitoring relay CM-SFS.2 For single-phase AC/DC currents
The CM-SFS.2 is an electronic current monitoring relay that monitors single-phase mains (DC or AC) for over- and undercurrent from 3 m A to 15 A. All devices are available with two different terminal versions. You can choose between the proven screw connection technology (double-chamber cage connecting terminals) and the completely tool-free Easy Connect Technology (push-in terminals).
Characteristics Approvals Monitoring of DC and AC currents (3 m A to 15 A) UL 508, CAN/CSA C22.2 No.14 TRMS measuring principle
One device includes 3 measuring ranges
Over- and undercurrent monitoring
ON- or OFF-delay configurable CCC
Open- or closed-circuit principle configurable RMRS Latching function configurable Threshold values for >I and <I adjustable
Marks
Fixed hysteresis (5 %)
Start-up delay TS adjustable (0 s; 0.1-30 s)
Tripping delay TV adjustable (0 s; 0.1-30 s) Precise adjustment by front-face operating controls Screw connection technology or Easy Connect Technology available Housing material for highest fire protection classification UL 94 V-0 Tool-free mounting on DIN rail as well as demounting 1x2 c/o (SPDT) contacts (common signal) or 2x1 c/o (SPDT) contact (separate signals for >I and <I) configurable 22.5 mm (0.89 in) width 3 LEDs for status indication
Page Summary Contents For ABB Data Sheet - CM-SFS.2P; CM-SFS.2S Current Window Monitoring Relay, Single-Phase AC DC
Manual Details
| Brand | Current |
|---|---|
| Pages | 19 |
| File Size | 1.06 MB |
| Published | June 06, 2026 |
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Frequently Asked Questions
What types of connections are available?
It offers both proven screw connection technology and tool-free Easy Connect Technology with push-in terminals.
Can the monitoring relay handle AC or DC currents?
Yes, it monitors single-phase mains (DC or AC) for over- and undercurrents in the range of 3 mA to 15 A.
How can I adjust the timing delays?
Both the start-up delay (Ts) and tripping delay (Tr) are adjustable from 0 s to 30 s.
Is the unit suitable for multiple measurement ranges?
Yes, it is available in versions with three measuring ranges simultaneously configurable (e.g., 3-30 mA, 10-100 mA, 0.1-1 A).