A-ISOMETER® IRDH375 IRDH375B - Bender

4. Connection4.1 WiringIRDH375(B) has plug-in terminals.Connect the terminals A1/+ and A2/- to the supply voltage U S in accordancewith IEC 60364-4-43. The connections to the supply voltage shall be providedwith protective devices to afford protection in the event of a short circuit(a 6 A fuse is recommended).Devices for protection against short-circuit in conformity withIEC 60364-4-43 for the IT system coupling L1/L2 can be omitted if the wiringis carried out in such a manner as to reduce the risk of a short-circuit to aminimum (a short-circuit-proof and earth-fault-proof wiring is recommended).Only one A-ISOMETER® may be connected to an external TEST or RESETbutton. The TEST and RESET button for collective testing of several insulationmonitoring devices must not be connected in parallel.External coupling devices connected via the terminal AK cannot be switchedoff via the internal coupling relays. If no coupling device is used, the terminalAK remains free.TGH1352en/11.200425