NEW OLD STOCK ของเหม่ เก่าเก็บ Voltage Selection relay, MVAP22spare for H V switchgearMVAP22D1AA0001BSerial No. 387855L110/125 VDC50 Hz Features-Detects voltage circuit failures-Can be used to switch to analternative supply if the mainsupply fails-Compact design-Mechanically stable Application The MVAP 22 is essentially a fusefailure relay with changeover outputcontacts enabling its use for eithervoltage selection or fuse failureprotection. A typical application asa voltage selection relay is theautomatic connection of meteringequipment to an alternative supply ifthe normal or preferred supply fails.As a fuse failure relay it will monitorthe output of a voltage transformerand give an alarm or disconnectprotection circuits for VT fuse failure.The relay monitors the three phasevoltage supply and operates if thesupply is interrupted or becomesunbalanced due to failure of thevoltage transformers primary orsecondary fuses.อ่านเพิ่มเติม