ThemotorprotectionrelayMRM3-2offersreliableprotectionforLVandMVmotorswhichareei-theroperatedviapowercontactorsorpowercircuitbreakers.Thefollowingfunctionsareintegratedintothisrelay: Overloadprotectionacc.toIEC255-8inconsiderationoftheinitialloadfactor (thermalimage) Definiteundercurrentprotection Definitetimeovercurrentprotection(DMT) Inversetimeovercurrentprotection(IMT)withselect-abletripcharacteristics Short-circuitprotection Loadunbalancesupervisionwithdefiniteorinversetripcharacteristics Earth-faultdetectionwithsuppressionofharmonics TheMRM3-2recognizesthe Start-Up and MotorRunning phase. Motorswithalimitednumberofstartscanbecontrolledbythestartlimitingfunctionoftherelay. Theearth-faultsupervisioniseitherrealizedinHolm-greenconnectionorbymeansofacore-typecurrenttransformer. 装置MRM3-2I系列HTL电流互感器输入3二进制输入7输出继电器4看门狗继电器1时间过流保护[50/51]是热模拟[49]是断路器故障保护[50BF]是负序保护[46]是电动机保护：锁定转子[51]是电动机保护：不完全启动[48]是电动机保护：最大启动次数[66]是电动机保护：欠电流[37]是电动机保护：热保护[49]是复位/闭锁是时间日期是参数组2故障记录仪（无丢失）是故障录波仪是输出继电器矩阵是RS485开型数据协议是ModbusRTU协议可选ProfibusDP可选ANSI:37,46,48,49,50,50BF,51,66IEC:I t;I2 ;IANL;J ,t;I ,I ;CBF;I t ,I t;-