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

The ABB CM-SRS.12 (1SVR430841R0300) 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 24–240 V AC/DC, this relay features a single changeover (SPDT) output contact rated at 250 V / 4 A, making it suitable for a variety of industrial and commercial monitoring applications.

The relay offers three selectable measuring ranges (0.3–1.5 A, 1–5 A, 3–15 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 3% to 30% of the threshold value. The compact 22.5 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: 24–240 V AC/DC

• Three measuring ranges: 0.3–1.5 A, 1–5 A, 3–15 A (AC/DC, TRMS)

• Configurable for overcurrent or undercurrent monitoring

• Adjustable hysteresis: 3–30% of threshold

• Output: 1 SPDT (changeover) contact, 250 V / 4 A

• Status LEDs for operational indication

• DIN rail mounting: 22.5 mm wide

• Front-accessible controls for easy configuration

• Sealable transparent cover available for tamper protection

• High fire protection: Housing material UL 94 V-0

• Mechanical lifetime: 30 million cycles

• Electrical lifetime: 100,000 cycles (AC-12, 230 V, 4 A)