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How can I lock the direct rotary handle on a Compact NS400 / NS630 circuit-breaker?.

The direct rotary handle can either be locked with padlocks or a keylock.

Locking with Padlocks:
Up to three padlocks can be fitted. The shackle diameter must be between 5 to 8mm.
Generic padlock
Locking with a keylock:
Install: a keylock adaptor (without lock), part number 32604, and either a Ronis lock, part number 41940 or a Profalux lock 42888
The locks have random key numbers and come complete with two keys.
Example Key Lock Ronis 41940Rotary Lock adaptor LV432604
 
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