Why Choose the ABB CM-MPS.21P Three-Phase Monitoring Relay?
The ABB CM-MPS.21P is a multifunctional three-phase monitoring relay designed to monitor critical electrical parameters in AC power systems. As part of the ABB CM-MPS three-phase monitoring relay series, it provides monitoring for phase failure, phase sequence, overvoltage, undervoltage, phase unbalance and interrupted neutral conditions.
The relay continuously monitors the connected electrical supply and provides a switching response when configured voltage or phase conditions are exceeded. Adjustable threshold values and selectable phase sequence monitoring allow the CM-MPS.21P to be configured for a range of industrial control and protection applications.
With a rated control supply and three-phase measuring voltage of 180–280 V AC and a 50 / 60 Hz operating frequency, the CM-MPS.21P provides a compact monitoring solution for three-phase electrical systems. Its maintenance-free Easy Connect Technology with push-in terminals enables straightforward installation within industrial control panels and automation systems.
Key Advantages
- Multifunctional three-phase monitoring relay for industrial electrical systems.
- 180–280 V AC measuring voltage suitable for compatible three-phase supplies.
- Monitors phase failure, phase sequence, overvoltage, undervoltage and phase unbalance.
- Includes interrupted neutral monitoring for additional supply supervision.
- Adjustable threshold values provide flexible monitoring configuration.
- Two changeover 2 c/o (SPDT) relay outputs provide switching interfaces for control systems.
- Maintenance-free push-in terminal technology simplifies electrical connections.
Key Features
- ABB CM-MPS three-phase monitoring relay series.
- CM-MPS.21P multifunctional monitoring relay.
- 180–280 V AC three-phase measuring voltage.
- 50 / 60 Hz rated frequency.
- Phase failure detection.
- Phase sequence monitoring.
- Overvoltage and undervoltage monitoring.
- Phase unbalance detection.
- Interrupted neutral monitoring.
- 2 c/o (SPDT) relay outputs.
- Adjustable overvoltage, undervoltage and phase unbalance thresholds.
- Selectable phase sequence monitoring.
- Selectable ON or OFF tripping delay from instantaneous operation up to 30 s.
- Maintenance-free Easy Connect Technology with push-in terminals.
- Three LEDs indicate operational states.
Reliable Three-Phase Monitoring for Industrial Control Systems
Three-phase monitoring relays such as the ABB CM-MPS.21P help protect electrical equipment and control systems by continuously checking important supply parameters. Detecting phase failure, incorrect phase sequence, voltage deviations and phase unbalance can help identify abnormal operating conditions before they affect connected equipment.
The CM-MPS.21P combines several monitoring functions within a single compact device. Adjustable voltage and phase unbalance thresholds, selectable phase sequence monitoring and configurable tripping delays allow the relay to be adapted to different industrial control requirements. Its two changeover relay outputs can be connected to contactors, PLC inputs, alarm circuits or other control equipment.
Typical Applications
- Three-phase electrical supply monitoring.
- Industrial control panels and automation systems.
- Motor and motor starter protection circuits.
- Pumps, fans and other rotating machinery.
- Control and alarm circuits requiring phase monitoring.
- Machine control and industrial production equipment.
- Electrical systems requiring phase sequence and voltage monitoring.
- Single-phase mains monitoring applications.
