The ABB CM-SRS. (SVRR) is a single-phase current monitoring relay designed for precise overcurrent or undercurrent detection in both AC and DC circuits. It operates with a wide control supply voltage of – V AC/DC and features a single changeover (SPDT) output contact rated at V / A. The relay offers three selectable measuring ranges—– mA, – mA, and .– A—using a true RMS (TRMS) measuring principle for accurate 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. It features front-accessible controls for precise adjustment and three status LEDs for clear operational indication. The compact . mm housing is DIN rail mountable and offers high fire protection (UL V-). The relay works according to the open-circuit principle and is suitable for industrial automation, process control, and equipment protection.

Key Features:

• Wide supply voltage: – V AC/DC

• Three measuring ranges: – mA, – mA, .– 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

• High fire protection: Housing material UL V-

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

• Mechanical lifetime: million cycles

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

• Tool-free mounting and demounting

ABB – CM-SRS.11 (1SVR430841R0200) – Current Monitoring Relay, 3–30mA/10–100mA