The ABB CM-SRS. (SVRR) is a single-phase current monitoring relay designed for reliable overcurrent or undercurrent detection in both AC and DC circuits. Operating with a wide control supply voltage of – V AC/DC, this relay features a single changeover (SPDT) output contact rated at V / A, making it suitable for a variety of industrial and commercial monitoring applications.

The relay offers three selectable measuring ranges (.–. A, – A, – A) and utilizes 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 compact . mm housing is DIN rail mountable and features front-accessible controls for easy setup. 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

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

• Status LEDs for operational indication

• DIN rail mounting: . mm wide

• Front-accessible controls for easy configuration

• Sealable transparent cover available for tamper protection

• High fire protection: Housing material UL V-

• Mechanical lifetime: million cycles

• Electrical lifetime: , cycles (AC-, V, A)

ABB – CM-SRS.12 (1SVR430841R0300) – Current Monitoring Relay, 0.3–15A, 24–240V