Siemens SIRIUS 3UG4 - Characteristics

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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 3UG4583-.CW3. insulation monitoring relay permanently monitors the insulation resistance of the remaining
system with all connected loads.
④ Loads
Figure 9-11 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.
9.4.6 Characteristics
Characteristics of the 3UG4582 insulation monitoring relays
The characteristics below show the load limit curves of the 3UG4582 insulation monitoring
relays.
3UG458. insulation monitoring relay.
9.4 3UG4582/3UG4583 insulation monitoring relays
SIRIUS 3UG4 / 3RR2 monitoring relay
Equipment Manual, 07/2021, NEB927043002000/RS-AD/005 197