Siemens 3UG4 - Page 228

3UG458. insulation monitoring relay
9.3 3UG4581 insulation monitoring relay
3UG4 / 3RR2 monitoring relays
228 Manual, 05/2016, NEB927043002000/RS-AC/004
Wiring examples 3UG4581 insulation monitoring relays
Measuring input L can be connected to any conductor (phase or N conductor). The rated
system voltage must be U
n
≤ 400 V AC (50 to 60 Hz).
2-wire AC system
3-wire AC system
4-wire AC system