Siemens SIRIUS 3UG4 - Page 194

Application examples
The 󹪝gure below shows monitoring for ground fault/insulation fault in the di󹪜erent load circuits.
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① The voltage source is the secondary side of an isolating transformer that galvanically isolates the system and the
downstream circuit.
② The insulation resistance of this motor feeder is always monitored when the motor is switched o󹪜. If the motor
contactor drops out, the two NC contacts connect the measuring circuit with the motor cables.
③ The 3UG4582-.AW3. insulation monitoring relay permanently monitors the insulation resistance of the remaining
system with all connected loads.
④ Loads
Figure 9-9 Monitoring for ground fault/insulation fault with di󹪜erent load circuits
Note
The maximum cable length of the control cables is 50 m or 100 pF/m.
Wiring examples 3UG4583 insulation monitoring relays
Measuring inputs L+ and L- can be connected to any conductor (phase or N conductor).
Measuring inputs L+ and L- must always be connected to di󹪜erent conductors.
The rated line voltage is U
n
≤ 400 V AC (15 to 400 Hz) or U
n
≤ 600 V DC. The 3UG4983-.A voltage
reducer module must be used to monitor systems with higher voltages.
3UG458. insulation monitoring relay.
9.4 3UG4582/3UG4583 insulation monitoring relays
SIRIUS 3UG4 / 3RR2 monitoring relay
194 Equipment Manual, 07/2021, NEB927043002000/RS-AD/005