ABB CM-MPS.21S Three Phase Monitoring Relay

Monitoring applications: Phase, Voltage
Supply voltage: 180 to 280 V AC
Contact arrangement: 2-pole switch
Voltage sensitivity: Overvoltage, Undervoltage
Electrical phases: 3
Voltage measurement range: 180 to 280 V AC
Delay time: 0.1 to 30 s, 0 s
Frequency sampling range: 45 to 65 Hz
Width: 22.5 mm

CM-MP x3 multifunctional three-phase monitoring relays. The CM-MPS.x3 is a multifunctional monitoring relay for three-phase power lines. It monitors phase parameters such as phase sequence, phase failure, overvoltage, undervoltage, and phase asymmetry. The CM-MPS.23 also monitors neutral for interruption. The thresholds for overvoltage, undervoltage, and phase asymmetry are adjustable. The CM-MPS.23 is also suitable for monitoring single-phase power lines. To do this, all three external conductors (L1, L2, L3) must be bridged and connected as a single conductor. Phase sequence monitoring must be disabled, and the threshold for phase asymmetry must be set to the maximum (25%).

Monitoring of three-phase power lines for phase sequence (can be turned off), phase failure, overvoltage, undervoltage, and phase asymmetry. Automatic phase sequence correction configurable. Interrupted monitoring of neutral possible with CM-MPS.23. The CM-MPS.23 can also be used to monitor single-phase power lines. Can be used for power lines with a frequency of 45 to 440 Hz. Thresholds for phase asymmetry, overvoltage, and undervoltage are adjustable as absolute values. Trigger delay can be set or turned off using a logarithmic scale. Selectable on-delay or off-delay triggering. Powered via the measurement circuit. True RMS measurement principle. 1x2 or 2x1 changeover contact (single-pole switch) configurable. 3 LEDs for status indication.