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1SVR740841R1400 ABB CM-SRS.21P Current Monitoring Relay 220-240 V AC
ABB CM-SRS.21P 1SVR740841R1400 is a 220–240 V AC single-phase current monitoring relay with 3 mA to 1 A measuring ranges, selectable overcurrent or undercurrent monitoring, two changeover contacts and push-in terminals.
£130.40
Why Choose the ABB CM-SRS.21P Current Monitoring Relay?
The ABB CM-SRS.21P, order code 1SVR740841R1400, is a compact and reliable single-phase current monitoring relay designed for supervising electrical current in industrial machinery, control and automation systems. As part of the ABB CM-SRS current monitoring relay series, it provides selectable overcurrent or undercurrent monitoring for detecting abnormal electrical load conditions.
The CM-SRS.21P provides three selectable measuring ranges of 3–30 mA, 10–100 mA and 0.1–1 A. This broad low-current measuring capability makes the relay suitable for applications such as load supervision, loss-of-load detection and monitoring electrical equipment for excessive or insufficient operating current.
With a rated control supply voltage of 220–240 V AC, two changeover (SPDT) output contacts and push-in terminal technology, the CM-SRS.21P provides flexible integration into industrial control panels. An adjustable tripping delay of 0 or 0.1–30 s helps distinguish sustained abnormal current conditions from brief fluctuations.
Key Advantages
- Reliable overcurrent and undercurrent monitoring for industrial applications.
- 220–240 V AC rated control supply voltage.
- Three selectable current measuring ranges covering 3 mA to 1 A.
- Suitable for monitoring both AC and DC currents.
- Adjustable 0 or 0.1–30 s tripping delay accommodates temporary current variations.
- Two changeover (SPDT) contacts provide flexible signalling and control outputs.
- Push-in terminals support efficient, maintenance-friendly control-panel wiring.
- Compact 22.5 mm-wide housing conserves DIN-rail space.
Key Features
- ABB CM-SRS current monitoring relay series.
- 220–240 V AC rated control supply voltage.
- Selectable overcurrent or undercurrent monitoring.
- Current measuring ranges of 3–30 mA, 10–100 mA and 0.1–1 A.
- RMS current measurement.
- Adjustable tripping delay of 0 or 0.1–30 s.
- 2 c/o (SPDT) output contacts.
- Push-in connection technology.
- Compact DIN-rail mounting format.
- Operating ambient temperature range of -20 to +60 °C.
Reliable Current Monitoring for Industrial Control Systems
Current monitoring relays supervise electrical circuits and loads by comparing measured current with a configured operating threshold. The ABB CM-SRS.21P can be used for either overcurrent or undercurrent monitoring, allowing a control system to respond when current rises above or falls below the required operating level.
The three selectable measuring ranges enable supervision from 3 mA up to 1 A, while the adjustable tripping delay can help prevent short-duration current fluctuations from causing unnecessary switching. Its 220–240 V AC control supply, dual changeover outputs and push-in terminals make it well suited to industrial electrical panels and automation cabinets.
Typical Applications
- Industrial machinery current supervision.
- Overcurrent and undercurrent detection.
- Motor and electrical load monitoring.
- Loss-of-load detection.
- Pumps, fans, conveyors and processing machinery.
- Industrial automation and process control systems.
- Electrical control panels and switchboards.
Technical Specifications
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| Time Delay | Adjustable | |
|---|---|---|
| Monitored Supply | Single-phase | |
| Signal / Input Range | 3–30 mA | |
| Monitoring Function | Current | |
| Series | CM-SRS | |
| ABB order code | 1SVR740841R1400 | |
| Product group | 310921 – Measuring & Monitoring Relays | |
| Product type | Single-phase current monitoring relay | |
| Monitoring function | Overcurrent or undercurrent monitoring | |
| Rated control supply voltage | 220–240 V AC | |
| Measuring principle | RMS | |
| Measuring range 1 | 3–30 mA | |
| Measuring range 2 | 10–100 mA | |
| Measuring range 3 | 0.1–1 A | |
| Tripping delay | 0 s or adjustable 0.1–30 s | |
| Output | 2 c/o (SPDT) contacts | |
| Connection technology | Push-in terminals | |
| Operating temperature | -20 to +60 °C | |
| Storage temperature | -40 to +85 °C | |
| Mounting type | DIN rail | |
| Width | 22.5 mm | |
| Height | 85.6 mm | |
| Depth | 103.7 mm | |
| Net weight | approx. 0.168 kg |
Frequently Asked Questions
What is the ABB CM-SRS.21P 1SVR740841R1400 used for?
The CM-SRS.21P is used for overcurrent or undercurrent monitoring in industrial electrical, machinery and automation systems.
What current ranges can the CM-SRS.21P monitor?
The relay provides three selectable measuring ranges of 3–30 mA, 10–100 mA and 0.1–1 A.
What supply voltage does this CM-SRS.21P require?
The ABB CM-SRS.21P with order code 1SVR740841R1400 has a rated control supply voltage of 220–240 V AC.
Does the CM-SRS.21P have an adjustable tripping delay?
Yes. The tripping delay can be set to 0 s or adjusted from 0.1–30 s, helping accommodate brief current variations where required.
What outputs and terminals does the CM-SRS.21P provide?
The relay provides two changeover (SPDT) output contacts and uses push-in terminals for convenient industrial control-panel wiring.
Trusted ABB Monitoring Technology
ABB CM measuring and monitoring relays provide dependable supervision of electrical parameters in industrial machinery, automation systems and control panels, helping identify abnormal operating conditions and support reliable system operation.
