Mitsubishi Electric C Series Handling And Maintenance page 57

Caution on OPEN (trip) button operation
(i) Shift MANU/AUTO selector switch to MANU. When MANU has been selected, the electric
operation circuit will be automatically open.
(ii) Press OPEN (trip) button and the breaker trips. The OPEN (trip) button operating load is approx.
5 N.
(iii) After pressing OPEN button, be sure to return the MANU/AUTO selector switch to AUTO.
When AUTO has been selected, the electric operation circuit is automatically closed.
Note 1: The breaker is structured so OPEN (trip) button cannot be pressed when the breaker is
OFF.
Note 2: Be sure not to turn the breaker OFF with the OPEN (trip) button pressed. Otherwise the
electric operation unit may be damaged.
Caution on test button operation
(i) To check the test button operation, check the breaker leakage indicator button through the
inspection hole at the right side of the electric operation unit. Also check that the breaker
operation status is indicated as "trip (yellow)" (for the 50·100·125AF).
Earth leakage breaker delay time and sensitivity selection
• Take the following procedure:
(i) Remove the operation circuit terminal wire and a power supply module setscrew to remove the
power supply module from the electric operation base.
(ii) Remove 2 setscrews from the electric operation unit, and remove the electric operation base
from the breaker.
(iii) Set the breaker sensitivity current selector switch and the earth leakage tripping time selector
switch.
(iv) After setting them, install the electric operation base and the power supply module.
(v) Replace the sensitivity current nameplate and the earth leakage tripping time nameplate with
those for the newly set ones.
(vi) Connect the operation circuit terminal again.
(vii) Check each operation again.
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