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Mitsubishi Electric C Series Handling And Maintenance page 67

Moulded case circuit breakers, earth leakage circuit breakers, earth leakage relays & circuit protectors
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(iv) In case when the main circuit is to be opened in emergency:
If the main circuit is to be opened in emergency by manual operation, the
circuit-breaker shall be made to trip depressing the trip button.
(v) OFF lock plate
If the electric operation unit is locked with a padlock with the OFF lock
plate drawn out, it cannot be operated anymore electrically nor mechani-
cally. This locking shall therefore be applied when ON operation is to be
prohibited or erroneous closing is to be avoided.
Note. The OFF lock plate has been so designed that it cannot be drawn
out before the completion of charging.
Up to three padlocks can be attached.
Indicator
(i)
Pay your full attention to it that the electric operation unit does not indicate
trip even when the circuit-breaker trips. It will indicate as below. Trip indi-
cator may be manufactured upon your request.
(Condition of the circuit-breaker) (Indicate by the electric operation unit)
(ii) Electric operation unit with trip indicator (special order)
Notice that the electric operation unit indicate trip when the circuit-breaker trips, but that the trip
indicator will evolve as below when the resetting operation is resumed. (Tripped → Indicate evolution
of the electric operation unit when resetting) Tripped → ON → OFF
Case of circuit-breaker with UVT
(i)
In case when the UVT comes into function with the circuit-breaker ON:
Making just after excitation of UVT becomes possible by automatic reset type circuitry.
(ii) In case when the UVT becomes non-excited with the circuit-breaker OFF:
Making is possible immediately after the excitation of UVT.
(b) Mounting method
Precaution to be taken when handling
(i)
Dismantling and remounting of the electric operation unit from and onto the circuit-breaker shall be
done with the circuit-breaker tripped or ON and with the electric operation unit discharged (indicator
of the electric operation unit: ON).
(ii) Note that the electric operation unit can be dismantled and remounted with cover provided (except
the Flush plate type).
(iii) If the electric operation unit is to be handled individually, confirm beforehand that it is discharged
(indicator : ON (red)).
If it is charged, depress the ON button to discharge it. Since the discharge is accompanied by a severe
shock, discharging operation should be performed on a firm stand or the like.
Mounting the front connection, rear connection and plung-in type
(i)
Remove the electric operation unit.
(ii) Mount the circuit-breaker on the board. The mounting on the board
is the same as that for the independent circuit-board both for front-
connection, rear-connection and plug-in types.
(iii) Wire the circuit-breaker with the internal accessory unit. If the
circuit-breaker has already been provided with the accessory, pro-
ceed to the wiring work under the condition.
65
ON
Tripped
OFF
ON
OFF
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