The CM-PAS.31P monitors the following parameters: phase failure, phase sequence and phase asymmetry. The rated control supply voltage of 160-300V AC corresponds to the measuring voltage, the device is supplied from the measuring voltage. Output 2 changeover contacts (250 V / 4 A). A switch-on delay can be set from 0 to 30s (0, 0, 1-30s). A sealable transparent cover to protect against unauthorized changes to the settings is available as an accessory. The device has maintenance-free and easy-to-use push-in terminals.