The monitoring relay for monitoring the correct phase sequence L1-L2-L3 (clockwise rotation) and monitoring the individual phase voltages for total failure. The phase voltages to be monitored are connected to terminals L1-L2-L3, terminals 11, 14 or 21, 24 of the relay output contacts are connected in front of the excitation coil of the motor contactor. If the phase sequence is correct, the output relay switches on (green LED on). If a phase fails completely, the output relay returns to its rest position (green LED off). A special supply voltage for the monitoring relay is not required. The device should only be connected to N if the three phases to be monitored are connected to N via a circuit (e.g. temperature monitoring or similar). Operating voltage 400 V AC Current consumption 20 mA Response delay 5 s Output / contact 2 changeover contacts (DPST) Output / switching voltage max. 250 V Output / continuous current max. 6 A Output / switching frequency 1200 switching cycles/h Mechanical service life 1 x 107 switching cycles Electrical service life 1 x 105 switching cycles Display LED green Dimensions W x H x D 22.5 x 75 x 95 mm Weight 120 g Operating temperature range -5 °C to +55 °C Storage temperature range -20 °C to +70 °C Protection class housing / terminals IP40 / IP20
