Specifications

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A.25

M-PACT

Interlocks

Mechanical interlocks can be fitted to the following electrical systems and can link 2 and/or 3 circuit breakers.

Any nominal rating, frame size, number of poles or type (fixed pattern or withdrawable) can be interlocked.

Typical circuit

Type C

2 from 3 way interlock

6 cable configuration

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.

Type D

1 from 3 way interlock variant

4 cable configuration (2 cables for bus

coupler)

Interlocking between 3 circuit breakers.

2 normal power supplies not set in

parallel

1 power supply may assist the priority

circuit

Available upon request.

Type E

2 from 3 way 'specific' interlock

4 cable configuration

Interlocking between 3 circuit breakers.

2 normal power supply can be set in

parallel

1 generator (emergency) supply

Available upon request.

Type B

1 from 3 way interlock

6 cable configuration

Interlocking between 3 circuit breakers.

3 power supplies (generator or trans-

formers) feeding the same busbar but

parallel operation is prevented.

Available upon request.

Type A

1 from 2 way interlock

2 cable configuration

Interlocking between 2 circuit breakers.

1 normal power supply

1 generator (emergency) supply

Interlock configuration

Circuit breaker B1 can only close if B2

is open

Circuit breaker B2 can only close if B1

is open

Only 1 from 3 breakers can be closed

Any 2 from 3 breakers can be closed

Any 1 from 3 breakers can be closed

2 breakers must be closed to prevent the

3rd breaker from closing

Circuit breaker B1 and/or B3 can be

closed only if B2 is open

Circuit breaker B2 can only be closed

if B1 & B2 are both open

Circuit breakers B1 and/or B2 can be

closed only if B3 is open

Circuit breaker B3 can only be closed

if B1 & B2 are both open

Possible combinations