Features Easy Installation: The base of the voltage detection relay adopts 35mm rail type or device type, and there are two screw hole structures inside, which can be directly installed separately or HT35 rail installation. Three Indicators: This 3-phase circuit protector is indicated by three indicators: normal, phase loss (voltage three-phase unbalance), and reverse phase. Phase Loss Protection: The phase loss protection of the voltage relay means that when the protected line is in the running state or non-running state, any phase loss occurs, and the delay is 2S. Reverse Phase Protection: The reverse phase protection of the voltage phase protection relay refers to the protection measures to prevent the wrong connection of the L1, L2, L3 three-phase AC phase sequence, and the action is delayed for 2S. Voltage Unbalance Protection: The voltage unbalance protection of the three-phase voltage relay refers to the protection measures that affect the safe operation of the line due to the unbalance of the three-phase voltage. This three-phase circuit protection relay has a wide range of applications and is suitable for air compressors, motors, distribution boxes, water pumps, oil pumps, central air conditioners, etc. Specification: Condition: Brand new Rated Voltage: 200-500VAC, 50/60Hz Protection Function: Phase failure and phase sequence Display Mode: LED Indicates working status Contact form: Two sets of normally open normally closed contacts Contact Capacity: 6A AC250V (resistive) Installation Method: 35mm Rail or device Size: Approx. 79 x 23 x 79mm / 3.1 x 0.9 x 3.1in   Package List: 1 x Protector   Note: This product is generally sampled on the power side of the three-phase power supply and must not be installed on the output side of the variable current. Package List