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

The ABB CM-SRS.22 (1SVR430841R0500) 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 24–240 V AC/DC and features two changeover (SPDT) output contacts rated at 250 V / 4 A, providing flexible integration into industrial automation and protection systems.

This relay offers three selectable measuring ranges: 0.3–1.5 A, 1–5 A, and 3–15 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 3% to 30% of the threshold value. The tripping delay is adjustable from instantaneous (0 s) up to 30 seconds, supporting both fast and delayed response requirements. The compact 22.5 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: 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 value

• Adjustable tripping delay: 0 s (instantaneous) or 0.1–30 s

• Output: 2 SPDT (changeover) contacts, 250 V / 4 A

• Status LEDs for operational indication

• DIN rail mounting: 22.5 mm wide

• Screw terminal connections

• High mechanical and electrical durability

• Degree of protection: IP50 (housing), IP20 (terminals)