This family of Voltage Sensing relays are used for protection of the motors, agricultural pumps, general purpose 3 phase motors o to avoid winding burnout.The major causes of motor burnout are Phase Unbalance, Phase Failure, Reversed Phase Sequence, Under Voltage, Over Voltage, Overloading, Winding overheating, Under current, Over current, Locked Rotor or Stalling, Short Circuit, Earth fault etc.Single phasing is a case of extreme unbalance condition and damage caused to motor is very severe.Various models are available with separate functions & features:Ex. VSP D1, VSP D2, HLS D2, HLV D2, ALV D2, P3 PFV1, F3 PFV1, VST D1, VPG D1, P1 PFS 1, P1 PFS 2, P2PFS1 Offer protection against Phase Failure, Phase Unbalance, Phase Sequence Reversal Conditions, which are dangerous to the motor winding and cause motor burnouts. It is useful for monitoring Mains Voltage Supply for general Voltage faults like Under Voltage & Over Voltage conditions Relays are available in DIN Rail mounting, 8 or 11 Pin Plug in type socket mounting, Panel Flush mounting enclosures.Models offer adjustable Unbalance settings, trip delay settings, fixed Under & Over Voltage settings, trip indications etc. Features : · Relays Monitor 3 Phase Voltage Supply. · Models with adjustable or preset unbalance voltage · Sultable for any System Voltage. · Powered by External or Built in Aux.Supply · Auto Reset or Manual / Remote Reset. · 1 or 2 CO Outputs · DIN Rail or Plug in socket mounted enclosures.