Why Choose the ABB CM-SRS.12S Current Monitoring Relay?
The ABB CM-SRS.12S is a compact and reliable single-phase current monitoring relay designed for overcurrent or undercurrent supervision in industrial control and automation systems. With ABB order code 1SVR730840R0300, this CM-SRS series relay operates from a wide 24–240 V AC/DC control supply and monitors both AC and DC currents using an RMS measuring principle.
The CM-SRS.12S provides three selectable measuring ranges of 0.3–1.5 A, 1–5 A and 3–15 A. It can be configured for either overcurrent or undercurrent monitoring, while adjustable hysteresis from 3–30% of the selected threshold value enables reliable switching behaviour matched to the application.
A single changeover (SPDT) output contact rated at 250 V / 4 A provides straightforward integration with contactors, PLC inputs, alarms and other control circuits. Screw connection technology with double-chamber cage terminals and a compact 22.5 mm housing make the CM-SRS.12S particularly suitable for space-conscious DIN-rail installations.
Key Advantages
- Reliable overcurrent or undercurrent monitoring for single-phase electrical systems.
- Wide 24–240 V AC/DC control supply supports diverse industrial applications.
- Three selectable measuring ranges covering 0.3–15 A.
- RMS measuring principle supports AC and DC current monitoring.
- Adjustable 3–30% hysteresis for application-specific switching behaviour.
- 1 c/o (SPDT) output contact for control and signalling circuits.
- Compact 22.5 mm-wide housing conserves DIN-rail space.
- Screw terminals provide secure and convenient field wiring.
Key Features
- ABB CM-SRS single-phase current monitoring relay series.
- 24–240 V AC/DC rated control supply voltage.
- Configurable overcurrent or undercurrent monitoring.
- Selectable measuring ranges of 0.3–1.5 A, 1–5 A and 3–15 A.
- RMS measuring principle for AC and DC currents.
- 3–30% adjustable hysteresis.
- 1 c/o (SPDT) relay output.
- 250 V / 4 A output contact rating.
- Open-circuit operating principle.
- Three LEDs for operating-status indication.
- Screw connection technology with double-chamber cage terminals.
- Compact DIN-rail mounting format.
Reliable Current Monitoring for Industrial Control Systems
Current monitoring relays help protect machinery and electrical systems by detecting current levels outside defined operating limits. The ABB CM-SRS.12S can be configured for either overcurrent or undercurrent monitoring, allowing excessive loads, loss of load and other current-related operating conditions to be detected through the associated control circuit.
Its three selectable measuring ranges enable current monitoring from 0.3 A up to 15 A, while RMS measurement provides dependable supervision of both AC and DC currents. Adjustable hysteresis helps prevent unwanted relay cycling close to the selected threshold, making the CM-SRS.12S suitable for reliable machine and process monitoring.
Typical Applications
- Industrial control and automation panels.
- AC and DC current supervision.
- Machine load and operating-state monitoring.
- Motor and actuator control circuits.
- Pump, fan and process equipment monitoring.
- Electrical distribution and control systems.
- Alarm and signalling circuits.
- OEM machinery and production equipment.
