Mitsubishi Electric C Series Handling And Maintenance page 58

(a) How to install
The users who purchased a single electric operation unit for 50·100·125AF are requested to take the
following procedure before installing the electric operation unit on the breaker:
<<50·100·125AF>>
(1) For the no-fuse breaker, untighten the breaker cover screw and remove the part shown in Fig.1
with nippers then tighten the breaker cover screw again. For the other breakers, cut out the
indicating plate in the position shown in Fig.1 with a cutter.
(2) Insert the attached indicating plate into the indicating plate hole on the breaker as shown in
Fig.2.
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