Mechanical Interlocks; Mechanical Interlock Of Type A - Two Circuit; Breakers; Mechanical Interlock Of Type B - Three Circuit- Breakers - ABB SACE Emax 2 Series Installation, Operation And Maintenance Instructions

3 - Mechanical Interlocks

Mechanical interlock of type A -
Two Circuit-breakers
Mechanical interlock of type B -
Three Circuit-breakers
Mechanical interlock of type C -
Three Circuit-breakers
Mechanical interlock of type D -
Three Circuit-breakers
241 | © 2013 ABB | 1SDH001000R0002 - L7804
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.
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 the assembly is available from the web site http://www.abb.com/abblibrary/
DownloadCenter/, in particular with the kit sheet 1SDH001000R0720.
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 from the web site http://www.abb.com/abblibrary/
DownloadCenter/, in particular with the kit sheet 1SDH001000R0721.
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 from the web site http://www.abb.com/abblibrary/
DownloadCenter/, in particular with the kit sheet 1SDH001000R0722.
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 from the web site http://www.abb.com/abblibrary/
DownloadCenter/, in particular with the kit sheet 1SDH001000R0723.
ABB | SACE Emax 2
Mechanical accessories | 3 - Mechanical Interlocks