Phase Balance Relay   Application :   The Rishabh Protector Phase Balance relay provides continuous surveillance of a 3 phase, 3 or 4 wire system and protects against:-   • Phase Loss   • Phase Reversal   • Sequence   • Phase Unbalance   • System Under Voltage         The protector de-energises a relay should any one of the above faults occur. It is fitted with an adjustable time delay to eliminate premature operation on short duration supply fluctuations. A red LED indicates that the supply is within limits and that the output relay is energised. The relay will not energise if the supply is connected in the wrong sequence.   The phase unbalance feature will protect motors of any size against:   • Excessive temperature rise due to unbalanced supplies (e.g. a 10% unbalanced supply can increase the temperature rise by 150%)   • The regenerated voltage generated during a single phase failure when running at low load.         Specifications :   System 3 phase, 3 or 4 wire Frequency 50 or 60Hz Nominal Voltage 100, 110, 120, 220, 230, 240, 380, 400, 415 & 440V (57 to 480V) Burden 3VA Voltage Withstand 1.2 x continuously 1.5 x for 10 x 10 seconds Set Point : Unbalance Adjustable 5% to 15% Time Delay Up to 10 seconds adjustable, 30 seconds maximum (not operative if voltage falls below 70% of the nominal voltage or set point on type 252-PSG) Under Voltage (Type 252-PSG only) Internally preset at 15% of nominal voltage (other values between 10% and 30% available on request) Weight Approximately - 0.3 kg Output Relay : Type D.P. Changeover Rating A.C 240V,5A non-inductive   D.C View chart Operations 0.2 million at the above loads Reset Automatic     - Protector Trip Relays   - A.C. Current Relay   - A.C. Voltage Relay with adjustable differential   - A.C. Voltage Relay with adjustable time delay   - Frequency Relay   - Combined Under / Over Voltage & Under / Over Frequency Relay   - Phase Sequence & Phase Failure Relay   - Phase Balance Relay   - Reverse Power (Current) Relay   - Synchro-Check Relay(Paralleling)   - D.C. Voltage Relay   - Thermistor Trip Relay   - Hot Spot 3 Relay   - Hot Spot 6 Relay   - Millivolt / Thermocouple Relay   - Transducer Trip   - Speed Sensing Trip Relay