APR-4 Protective AC 380V Red LED Light Phase Failure Sequence Relay 17070403 Product Pictures Product Features Reversed phase protection: to prevent L1, L2, L3 connected three-phase fault of a phase sequence protection, delay 1-2S action. Phase loss protection: it means the protection circuit in the running state or running state, the occurrenc of any one phase open phase failure, delay 1-2S action. APR-3 only detection of voltage, regardless of the load current. Product Description Product Name: Phase Faliure Relay Model: APR-4 Type: Three-phase, SPDT Working Voltage: AC 380V Indicater: Normal Output Contact: 5A, AC 250V Power Consumption: