The monitoring relay for monitoring the correct phase sequence L1-L2-L3 (clockwise) 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 upstream of the excitation coil of the motor contactor. If the phase sequence is correct, the output relay switches on (green LED on). In the event of a total failure of a phase, the output relay returns to its rest position (green LED off). A special supply voltage for the monitoring relay is not required. The device must be connected to N. If the neutral conductor fails, the output relay returns to its rest position (green LED off). https://elecena.pl/product/23594041/110292032230-phase-monitoring-pfd3-e12 2023-06-04 https://elecena.pl/product/23594041/110292032230-phase-monitoring-pfd3-e12 2026-06-26