2.14
SEL-551 Relay Instruction Manual Date Code 20110408
Installation
EIA-485 Rear-Panel Adapter
Figure 2.14 SEL-551 Provides Dedicated Breaker Failure Protection
EIA-485 Rear-Panel Adapter
Cable C675 is used with the EIA-485 rear-panel serial communications port
option to bring the pins from the 9-pin serial communications connector (see
Figure 5.1) out to a terminal block for ease of wiring.
52A
CBA
TC
52
(-) Retrip
Circuit
Breaker
Failure
to Annunciator or RTU
Trip
Coil
(+)
(+)
(+)
86B
Out
Lock
86
(-)
SEL-551 Relay
IN
IC
IB
IA
IN2
IN1
ALARM
OUT4
OUT3
OUT2
OUT1
Breaker Failure Initiate
(-)
(+)
BFI
Circuit
Trip
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