103
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7. Operation of the switchgear
Circuit-breaker - type HD4
Manual operation for spring charging:
To manually charge the closing springs, fully
insert charging lever into seat and turn it until the
yellow indicator appears.
Electrical operation for spring charging:
The circuit-breaker can be fitted with the
following accessories for electrical operation:
• Geared motor for automatic charging of the
closing springs
• Shunt closing release
• Shunt opening release
The geared motor automatically recharges the
springs after each closing operation until the
yellow indicator 2 appears. Should there be no
voltage during charging, the geared motor stops
and then starts recharging the springs
automatically when the voltage is on again. In any
case, it is always possible to complete the
charging operation manually.
Circuit-breaker closing:
This operation can only be carried out with the
closing springs completely charged. For manual
closing press pushbutton 4 (Figure 170). When
there is a shunt closing release, the operation can
also be carried out by means of a control circuit.
The indicator 2 shows that closing has been
accomplished.
Circuit-breaker opening:
For manual opening, press pushbutton 1 (Figure
170). When there is a shunt opening release, the
operation can also be carried out with remote
control by means of a control circuit. The
indicator 2 shows that opening has been
accomplished. An additional control mechanism
fitted in the door of the circuit-breaker
compartment enables mechanical operation of
the circuit-breaker with the door closed and with
the withdrawable part in either position.
• Press the relevant mechanical pushbutton,
having previously turned knob anti-clockwise
to the stop, if the withdrawable part is in the
service position.
• Observe the switch position indicator
Detailed information about installation and
maintenance can be found in instruction manual.
Figure 169:
1 Control wiring plug
2 Signaling device
3 Shaft for manual closing spring charging
4 Withdrawable assembly
Figure 170:
1 Opening pushbutton
2 Operation counter
3 Circuit-breaker open/closed indicator
4 Closing pushbutton
Operating and signalling
parts of HD4 circuit-breaker
HD4 type circuit-breaker - side view
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