AC network insulation monitor ISOMETER® isoLR275

AC/DCDC4-20 mA

Insulation monitoring device for AC and DC IT systems Application main circuits with low-resistance insulation level Separately adjustable response values 200 Ω…100 kΩ Isometer disconnecting relay for the operation of several ISOMETER® in interconnected IT systems History memory with real-time clock for storing alarm messages with date and time The isoLR275 ISOMETER® in conjunction with the AGH-LR coupling device monitors the insulation resistance of IT systems. It is suitable for universal use in 3(N) AC, AC/DC and DC systems. AC systems may include extensive DC-supplied loads, such as converters or thyristor-controlled DC drives. The adaptation to the existing system leakage capacitances takes place automatically. Only use the AGH-LR coupling device supplied with the device for adaptation of the nominal voltage range. isoLR275 can share the BMS bus with other bus devices Features : ISOMETER® for IT AC systems with galvanically connected rectifiers or converters and for IT DC systems (IT = unearthed systems) Particularly suited for monitoring electrical installations with a low level of resistance isoLR275 is always operated in conjunction with AGH-LR Automatic adaptation to the existing system leakage capacitance AMPPlus measurement method (European Patent: EP 0 654 673 B1) Choice of measurement methods to meet different requirements Two separately adjustable response ranges of 0.2 kΩ…100 kΩ each (Alarm 1, Alarm 2) Two-line LC display Automatic device self test Memory with real-time clock to store alarm messages with date and time stamp BMS interface (Bender Measuring Device Interface) for communication with other Bender devices (RS-485 galvanically isolated)