CCRBRF (50BF) can be single- or three-phase initiated to allow use with single pole tripping
applications. For the three-phase version of CCRBRF (50BF) the current criteria can be set to trip
only if two out of four for example, two phases or one phase plus the residual current pickups. This
gives a higher security to the back-up trip command.
CCRBRF (50BF) function can be programmed to give a single- or three-phase re-trip of its own
breaker to avoid unnecessary tripping of surrounding breakers at an incorrect initiation due to
mistakes during testing.
8.8.3 Function block
M11944-3 v7
CCRBRF (50BF)
I3P*
BLOCK
BFI_3P
BFI_A
BFI_B
BFI_C
52A_A
52A_B
52A_C
52FAIL
TRBU
TRBU2
TRRET
TRRET_A
TRRET_B
TRRET_C
CBALARM
ANSI06000188-2-en.vsd
ANSI06000188 V2 EN-US
Figure 274: CCRBRF (50BF) function block
8.8.4 Signals
PID-3562-INPUTSIGNALS v5
Table 256: CCRBRF (50BF) Input signals
Name Type Default Description
I3P GROUP
SIGNAL
- Three phase group signal for current inputs
BLOCK BOOLEAN 0 Block of function
BFI_3P BOOLEAN 0 Three phase breaker failure initiation
BFI_A BOOLEAN 0 Phase A breaker failure initiation
BFI_B BOOLEAN 0 Phase B breaker failure initiation
BFI_C BOOLEAN 0 Phase C breaker failure initiation
52a_A BOOLEAN 0 Circuit breaker closed in phase A
52a_B BOOLEAN 0 Circuit breaker closed in phase B
52a_C BOOLEAN 0 Circuit breaker closed in phase C
52FAIL BOOLEAN 0 CB faulty, unable to trip. Back-up trip instantaneously
1MRK 502 066-UUS B Section 8
Current protection
525
Technical manual
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