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Cylinder locks for implementing interlocks between multiple 3VA molded case circuit breakers

Cylinder locks (type Ronis) can be installed in the accessories compartments not only to lock molded case circuit breakers, see chapter Cylinder locks for locking the 3VA molded case circuit breaker, but also to implement mutual interlocks between an unlimited number of 3VA molded case circuit breakers. The purpose of this system is to ensure that only one single 3VA molded case circuit breaker included in the interlock application can be in the ON (I) position at any given time.

In order to implement a mutual interlock between multiple 3VA molded case circuit breakers, the following two components must be ordered for each circuit breaker to be included in the interlock arrangement:

In order to implement a mutual interlock between three 3VA molded case circuit breakers, for example, three cylinder locks (type Ronis) with the same lock number and 3 adapter kits suitable for the relevant circuit breakers must be ordered.

Installing the cylinder lock in the accessories compartment

The cylinder lock (type Ronis) is installed together with the adapter kit and the interlocking version of the cylinder lock housing in the right-hand accessories compartment of the molded case circuit breaker.

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Adapter kit

Cylinder lock housing for interlocking

Actuating lever

Cylinder lock (type Ronis)

Lid of accessories compartment

  1. Remove the lid of the accessories compartment ③ from the 3VA molded case circuit breaker.

  2. Drill a hole through the lid at the position marked on the rear face and smooth down the drilled surface with a file.

  3. Insert a cylinder lock (type Ronis) ⑤ and the interlocking version of the cylinder lock housing ④ in the drilled hole and connect it securely to the accessories compartment lid ② via the actuating lever.

  4. Install the adapter kit ① in the right-hand accessories compartment of the 3VA molded case circuit breaker.

  5. Reattach the accessories compartment lid to the 3VA molded case circuit breaker.

A cylinder lock (type Ronis) is installed at each 3VA molded case circuit breaker to be included in the interlock arrangement.

Interlocking of molded case circuit breakers

WARNING

Use of more than one key poses safety hazard and/or risk of damage to property

Leave only 1 key inserted in one of the circuit breakers included in the interlock arrangement.

Store all other keys in a safe place or lock them away.

In order to ensure reliable functioning of the interlock, only 1 key is left in one circuit breaker included in the interlock arrangement. This one key serves as the release instrument for only one molded case circuit breaker at a time.

  1. Move all 3VA molded case circuit breakers in the interlock arrangement to the OFF position and lock them (turn the cylinder lock to the horizontal "locked" position).

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  2. Remove all keys.

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    All 3VA molded case circuit breakers in the interlock arrangement are now safely locked in the OFF (O) position and cannot be operated.

  3. Insert one single key in one circuit breaker included in the interlock; store or lock away all other keys.

  4. Use the single key to turn the cylinder lock of the 3VA molded case circuit breaker to be released to the "unlocked" position.
    Once the key is in the "unlocked" position, it must not be removed.

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  5. Move the handle of the released 3VA molded case circuit breaker to the ON (I) position.

Releasing a different molded case circuit breaker

  1. Move the handle of the currently released molded case circuit breaker to the OFF (O) position.

  2. Turn the cylinder lock to the vertical "locked" position and remove the key.
    This 3VA molded case circuit breaker is now safely locked in the OFF (O) position and cannot be operated.

  3. Use the same key to turn the cylinder lock of the 3VA molded case circuit breaker to be released to the horizontal "unlocked" position.

  4. Move the handle of the released 3VA molded case circuit breaker to the ON (I) position.

Interlock combinations

The following interlock combinations can be implemented with cylinder locks:

Installation of other accessories

When the cylinder lock is fitted in the accessories compartment of the circuit breaker, some other accessories cannot be installed, see chapter Possible combinations of of accessories.

Slide for locking in the OFF position

Slide for locking in the ON position

Locking version of cylinder lock housing

Interlocking version of cylinder lock housing

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