The CM-MPS.21S is a multi-functional relay from the CM series of three-phase monitors. It operates with a nominal control supply voltage / three-phase measurement voltage of 180-280 V AC 50/60 Hz and has a 2 c/o (SPDT) output with contacts of a nominal voltage of 250 V / 4 A.

This relay is also suitable for single-phase network monitoring. It monitors all phase parameters like over/under voltage, phase unbalance, phase failure as well as interrupted neutral.

The corresponding threshold values are adjustable. Phase sequence monitoring as well as on or off delay is selectable. The activation delay is adjustable in a range of instantaneous to 30 s (0, 0.1-30 s).

A sealable transparent cover to protect against unauthorized changes is available as an accessory. The device offers screw connection technology with dual chamber cage connection terminals.

Technical specifications