ABB | SACE Emax 2
Mechanical accessories | 3 - Mechanical Interlocks267 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
3 - Mechanical Interlocks
Mechanical interlocks determine the opening/closing logic between two or three circuit-breakers.
Four types of interlocks are available, usable in both fixed and withdrawable versions.
Mechanical interlock of type A -
Two Circuit-breakers
1 2
O
I
O
O
O
I
The Type A interlock is applicable to two circuit-breakers (normal power supply + emergency power supply).
It allows you never to have two circuit-breakers in the closed position at the same time.
Information on assembly is available on the website http://www.abb.com/abblibrary/DownloadCenter/, in
particular with the kit sheets:
• 1SDH000999r0720 for interlock between E1.2circuit-breakers
• 1SDH001000r0720 for interlock between E2.2-E4.2-E6.2 circuit-breakers
• 1SDH000999r0721 for interlock between one E1.2 circuit-breaker and one E2.2-E4.2-E6.2 circuit-breaker
Mechanical interlock of type B -
Three Circuit-breakers
1 2 3
O
I
O O
I
O
O
O
O
O
I
O
O
I
I
The Type B interlock is applicable to three circuit-breakers (two normal power supplies + emergency power
supply).
It only allows the closing of the two circuit-breakers of the normal power supply if the circuit-breaker of the
emergency power supply is open. The circuit-breaker of the emergency power supply can be closed only if
the others two are open.
Information on the assembly is available on the website http://www.abb.com/abblibrary/DownloadCenter/, in
particular with the kit sheet 1SDH001000r0721.
Mechanical interlock of type C -
Three Circuit-breakers
1 2 3
O
I
O O
O
O
O
O
I
O
I
I
O
O
I
I I O
II O
The Type C interlock is applicable to three circuit-breakers (two normal power supplies + a bus tie).
It allows the simultaneous closing of one or two circuit-breakers, resulting in two possible types of power
supply of the half busbars:
• power supply from a single transformer (bus tie closed)
• power supply from both transformers (bus tie open)
Information on the assembly is available on the website http://www.abb.com/abblibrary/DownloadCenter/, in
particular with the kit sheet 1SDH001000r0722.
Mechanical interlock of type D -
Three Circuit-breakers
1 2 3
O
I
O O
O
O
O
O
I
I
O
O
The Type C interlock is applicable to three circuit-breakers (three power supplies on the same bar that must
not operate in parallel)
It allows only one of the three circuit-breakers to be closed.
Information on the assembly is available on the website http://www.abb.com/abblibrary/DownloadCenter/, in
particular with the kit sheet 1SDH001000r0723.
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