Why Choose the ABB CM-SRS.M1P Current Monitoring Relay?
The ABB CM-SRS.M1P, order code 1SVR740840R0600, is a multifunctional single-phase current monitoring relay designed to monitor AC and DC currents for overcurrent and undercurrent conditions in industrial control and automation systems. As part of the ABB CM-SRS current monitoring relay range, it combines precise TRMS current measurement with configurable operating functions for flexible electrical load supervision.
The CM-SRS.M1P provides three selectable measuring ranges of 3–30 mA, 10–100 mA and 0.1–1 A. It supports selectable overcurrent or undercurrent monitoring, open- or closed-circuit operating principles and a configurable latching function. Adjustable hysteresis from 3–30% of the threshold value enables accurate adaptation to different monitoring requirements.
With a wide 24–240 V AC/DC rated control supply voltage, two changeover output contacts and ABB Easy Connect push-in terminal technology, the CM-SRS.M1P is well suited to modern industrial control panels. Adjustable start-up and tripping delays from instantaneous operation to 30 s provide additional flexibility for applications where temporary current fluctuations should not cause unwanted switching.
Key Advantages
- Multifunctional AC and DC current monitoring for industrial applications.
- Configurable overcurrent or undercurrent monitoring.
- Three measuring ranges covering 3 mA to 1 A.
- Wide 24–240 V AC/DC control supply simplifies integration into different control systems.
- Selectable open- or closed-circuit operating principle.
- Configurable latching function for retaining detected fault states where required.
- Adjustable 3–30% hysteresis for application-specific switching behaviour.
- Independent adjustable start-up and tripping delays help accommodate temporary current conditions.
- Maintenance-free push-in terminals support fast and convenient wiring.
Key Features
- ABB CM-SRS multifunctional current monitoring relay.
- 24–240 V AC/DC rated control supply voltage.
- TRMS measuring principle for AC and DC currents.
- Measuring ranges of 3–30 mA, 10–100 mA and 0.1–1 A.
- Selectable overcurrent or undercurrent monitoring.
- Selectable open- or closed-circuit principle.
- Selectable latching function.
- Adjustable hysteresis of 3–30% of the threshold value.
- Adjustable start-up delay of 0 or 0.1–30 s.
- Adjustable tripping delay of 0 or 0.1–30 s.
- 2 c/o (SPDT) output contacts.
- Output contacts rated at 250 V / 4 A.
- Three LEDs provide operating-status indication.
- Compact 22.5 mm-wide DIN-rail housing.
Flexible Current Monitoring for Industrial Automation
Current monitoring relays supervise electrical circuits and loads to identify current levels that move outside configured limits. The ABB CM-SRS.M1P can monitor both AC and DC currents using a TRMS measuring principle and can be configured for either overcurrent or undercurrent operation, making it suitable for detecting overloads, loss of load and other abnormal operating conditions.
The multifunctional design adds selectable operating and latching principles together with independently adjustable start-up and tripping delays. These functions enable the CM-SRS.M1P to distinguish between normal temporary current variations and conditions that require a control or signalling response, while its push-in terminals and compact DIN-rail housing simplify control-panel installation.
Typical Applications
- Industrial machinery current supervision.
- Overcurrent and undercurrent detection.
- Motor and electrical load monitoring.
- Detection of load loss and abnormal operating conditions.
- Pumps, fans, conveyors and processing machinery.
- Industrial automation and process control systems.
- Electrical control and distribution panels.
