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Rear interlock

Rear interlock

The rear interlock system is capable of creating an interlock between two 3VA molded case circuit breakers and does not restrict the number of accessories which can be assembled on the front panel of the molded case circuit breaker.

The rear interlock operates according to the following principle: When one molded case circuit breaker is closed, the other circuit breaker is prevented from closing by a tappet which engages in the breaker mechanism directly from the rear panel of the molded case circuit breaker.

The rear interlock is provided by two interlocking modules which are attached at the rear of the molded case circuit breakers and behind the mounting plate. The two interlocking modules are interconnected by means of the interlocking rod.

Machining work to the cubicle mounting plate is required.

NOTE

For installation instructions, please refer to the operating instructions for the rear interlock.

Scope of delivery

The order number includes the following items:

  • Two interlocking modules

  • Mounting accessories

  • Interlocking rod

Interlock combinations

The following interlock combinations are possible:

  • All 3VA1 and 3VA2 molded case circuit breakers can be mutually interlocked.

  • Interlocks can be implemented between all sizes of breakers.

  • Mutual interlocks can be implemented between all 2-pole, 3-pole and 4-pole molded case circuit breakers.

Handle positions

When a rear interlock is installed between two 3VA molded case circuit breakers, the following combinations of handle position are possible:

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Aid to facilitate installation of rear interlock

An installation aid is available for all 3VA molded case circuit breakers. It facilitates installation of the rear interlock and reduces the amount of work required to the cubicle mounting plate.

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Mounting plates (specific to molded case circuit breaker)

DIN rail

  1. Assemble installation frame:

    • Place mounting plates ① on the molded case circuit breaker.

    • Install rear interlock.

    • Bolt the DIN rails ② to the adapter plates.

  2. Bolt the assembled installation frame to the cubicle mounting plate.

No further work to the cubicle mounting plate is required.

The same rear interlock combinations can be implemented regardless of whether or not the installation aid is used.

NOTE

For installation instructions, please refer to the operating instructions for the rear interlock.

Rear interlock for plug-in and draw-out units

In order to use a rear interlock for plug-in or draw-out versions of the molded case circuit breakers, the tappet needs to be lengthened. The tappet extension transfers the interlocking motion of the modules through the plug-in socket or the draw-out socket.

The rear interlock for plug-in or draw-out units is available as a complete kit containing all the required components:

  • Two interlocking modules

  • Mounting accessories

  • Interlocking rod

  • All the required tappet extensions

An installation aid must be ordered separately if it is required.

Interlock combinations

The same rear interlock combinations can be implemented for plug-in and draw-out versions as for fixed-mounted versions.

Molded case circuit breaker 1

Interlocking modules

Molded case circuit breaker 2

Cubicle mounting plate

Mounting accessories

Interlocking rod

Interlocking module

Plug-in or draw-out socket

Tappet extension

Molded case circuit breaker

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