Why Choose the ABB CM-SRS.M2S Current Monitoring Relay?
The ABB CM-SRS.M2S is a multifunctional single-phase current monitoring relay designed for reliable overcurrent and undercurrent supervision in industrial control and automation systems. With ABB order code 1SVR730840R0700, this CM-SRS series relay operates from a wide 24–240 V AC/DC control supply and provides RMS monitoring of both AC and DC currents.
The CM-SRS.M2S is designed for higher-current monitoring, with selectable measuring ranges covering 0.3–1.5 A, 1–5 A and 3–15 A. Its multifunction design allows the relay to be configured for overcurrent or undercurrent monitoring, while adjustable hysteresis and timing functions provide flexibility for adapting the switching response to different machines and processes.
The relay provides two changeover (SPDT) output contacts for integration with contactors, PLC inputs, alarms and interlocking circuits. Adjustable start-up and tripping delays help accommodate temporary current conditions such as motor starting, while its compact 22.5 mm housing and screw terminals simplify installation in DIN-rail control panels.
Key Advantages
- Multifunctional overcurrent and undercurrent monitoring in one compact relay.
- 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 hysteresis provides stable switching around the selected threshold.
- Adjustable start-up delay helps accommodate temporary starting currents.
- Adjustable tripping delay allows the response to transient current conditions to be tailored.
- Two changeover (SPDT) contacts provide flexible control and signalling options.
Key Features
- ABB CM-SRS multifunction current monitoring relay series.
- 24–240 V AC/DC rated control supply voltage.
- Selectable 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.
- Adjustable 3–30% hysteresis.
- 0 or 0.1–30 s adjustable start-up delay.
- 0 or 0.1–30 s adjustable tripping delay.
- Selectable latching or non-latching operation.
- Selectable open- or closed-circuit operating principle.
- 2 c/o (SPDT) relay outputs.
- Screw connection technology for secure field wiring.
Flexible Current Monitoring for Industrial Systems
Current monitoring relays allow industrial control systems to detect electrical loads operating above or below defined current limits. The ABB CM-SRS.M2S combines overcurrent and undercurrent supervision with configurable operating behaviour, making it suitable for detecting overload, underload, loss of load and other current-dependent operating conditions.
Its measuring capability up to 15 A enables direct supervision of a broad range of industrial loads. Adjustable start-up and tripping delays can help prevent brief current variations from causing unnecessary switching, while two changeover contacts provide flexible interfacing with machine controls, alarms and protective circuits.
Typical Applications
- Industrial control and automation panels.
- AC and DC current supervision.
- Motor overload and underload monitoring.
- Pump and fan operating-state monitoring.
- Conveyor and material handling equipment.
- Heating element and electrical load supervision.
- Alarm, signalling and interlocking circuits.
- OEM machinery and production equipment.
