The ABB CM-SRS. (SVRR) is a versatile single-phase current monitoring relay designed for overcurrent or undercurrent detection in both AC and DC circuits. It operates with a wide control supply voltage of – V AC/DC and features two changeover (SPDT) output contacts rated at V / A, providing flexible integration into industrial automation and protection systems.

This relay offers three selectable measuring ranges: .–. A, – A, and – A, utilizing a true RMS (TRMS) measuring principle for precise current monitoring, regardless of waveform. The device is configurable for either overcurrent or undercurrent monitoring, with an adjustable hysteresis from % to % of the threshold value. The tripping delay is adjustable from instantaneous ( s) up to seconds, supporting both fast and delayed response requirements. The compact . mm housing is DIN rail mountable and features screw terminals for secure wiring. Status LEDs provide clear indication of operational states.

Key Features:

• Wide supply voltage: – V AC/DC

• Three measuring ranges: .–. A, – A, – A (AC/DC, TRMS)

• Configurable for overcurrent or undercurrent monitoring

• Adjustable hysteresis: –% of threshold value

• Adjustable tripping delay: s (instantaneous) or .– s

• Output: SPDT (changeover) contacts, V / A

• Status LEDs for operational indication

• DIN rail mounting: . mm wide

• Screw terminal connections

• High mechanical and electrical durability

• Degree of protection: IP (housing), IP (terminals)

ABB – CM-SRS.22 (1SVR430841R0500) – Current Monitoring Relay, 0.3–15A, 24–240V