Function diagrams 3UG4512
Phase failure Incorrect phase sequence
11/14
L1-L2-L3L2-L3L1-L2-L3
11/12
21/24
21/22
OFF OFFON
LED
1
2
11/14
11/12
21/24
21/22
L3-L2-L1
FLASH OFFOFF
LED
1
2
① Red ① Red
② Phase failure ② Phase sequence
6.3.3 Diagnostics
6.3.3.1 Diagnostics with LED
Status display
The following information about the operating state is displayed on the 3UG4512 line
monitoring relay:
Operating state LED State of the output relays
Coil symbol (green) Phase failure / phase se‐
quence (red)
12/ 11/ 14
22/ 21/ 24
• Supply voltage not present
O O
• Supply voltage present
• Correct phase sequence
• All phases available
On O
• Supply voltage present
• Incorrect phase sequence
On ashing
• Supply voltage present
• Phase failure
On On
3UG4.1 line monitoring relay
6.3 3UG4512 line monitoring relay
SIRIUS 3UG4 / 3RR2 monitoring relay
Equipment Manual, 07/2021, NEB927043002000/RS-AD/005 89
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