6.3 3UG4512 line monitoring relay
6.3.1 Operator controls and connection terminals
Front view / terminal labeling 3UG4512
Front view Description
24
2122
12
14
11
L3
L2
L1
3UG4512-.....
SIRIUS
3 160-690V
Phase loss
Phase sequence
L1
L2 L3
11
12 14
L
21
22
24
Position digits
① Terminal block (removable)
Connection is possible using screw-type terminals or spring-loaded terminals.
② Circuit diagram
③ Device article number
④ Label
⑤ Status display: LED phase failure / phase sequence (red)
⑥ Status display: LED coil symbol (green)
Terminal labels
L1, L2, L3 Rated control supply voltage
12 Output relay K1 CO contact NC contact
11 Output relay K1 CO contact root
14 Output relay K1 CO contact NO contact
22 Output relay K2 CO contact NC contact (on the 3UG4512‑.B only)
21 Output relay K2 CO contact root (on the 3UG4512‑.B only)
24 Output relay K2 CO contact NC contact (on the 3UG4512‑.B only)
You can nd additional information on the connection terminals and the permissible conductor
cross-sections in the Chapter "Connection methods (Page 23)".
You can nd information on connecting in the Chapter "Circuit diagrams (Page 90)".
6.3.2 Function
General functionality
The 3UG4512 line monitoring relays monitor the phase sequence and the phase failure of one
of the three phases in a three-phase system. The asymmetry threshold is 10 %.
The devices are self-powered (measuring voltage = rated control supply voltage) and work on
the closed-circuit principle. The 3UG4512 line monitoring relays monitor all phases of three-
phase AC networks from 160 to 690 V through terminals L1 / L2 / L3 and also draw power from
all three phases simultaneously.
3UG4.1 line monitoring relay
6.3 3UG4512 line monitoring relay
SIRIUS 3UG4 / 3RR2 monitoring relay
Equipment Manual, 07/2021, NEB927043002000/RS-AD/005 87
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