Interlocks - GE M-PACT Plus Manual

Interlocks

Mechanical interlocks can be fi tted to the following electrical
systems and can link 2 or 3 circuit breakers of any rating or
number of poles, fi xed or withdrawable.
Typical circuit Interlock confi guration
Type A
Interlocking between 2 circuit breakers
B1 normal power supply
B2 generator (emergency) supply
Type B
Interlocking between 3 circuit breakers
3 power supplies (generator or
transformers) feeding the same
busbar but parallel operation is prevented.
Available upon request.
Type C
Interlocking between 3 circuit breakers
2 bus sections can be powered by a
single transformer (bus coupler
closed) or by both transformers
(bus coupler open).
Available upon request.
M-PACT Plus
Possible combinations
B1 B2
0 0
I 0
0 I
Circuit breaker B1 can only close if B2 is open
Circuit breaker B2 can only close if B1 is open
B1 B2
0 0
I 0
0 I
0 0
Only 1 from 3 breakers can be closed
B1 B2
0 0
I 0
0 I
0 0
I 0
0 I
I I
Any 2 from 3 circuit breakers can be closed
Any 1 from 3 circuit breakers can be closed
B3
0
0
0
I
B3
0
0
0
I
I
I
0
A.21
A
B
C
X