17
1
4
8
3
5
6
7
9
2
Key
1 Release PR521 or REF 601 (if provided)
2 Gas state indicator (if provided).
3 Opening pushbutton
4 Closing pushbutton
5 Operation counter (if provided)
6 Circuit-breaker open/closed indicator
7 Signalling device for closing springs loaded/discharged
8 Shaft for loading the closing springs in the manual mode
9 Key lock
6.
Instructions for operating the circuit-breaker
6.1 Safety indications
HD4/... circuit-breakers guarantee a minimum IP3X degree of protection when installed in the following
conditions:
– fixed version, installed behind a protective metal net
– plug-in version, installed in switchgear.
In these conditions the operator is totally protected against accidental contact with moving parts.
Pay the greatest attention to moving parts if the circuit-breaker is subjected to mechanical operations
outside the switchgear or when the protective nets have been removed.
If the operations are obstructed, do not force the mechanical interlocks and check that the operating
sequence is correct.
The circuit-breaker must be gradually racked-in and out of the switchgear to avoid shocks that could
deform the mechanical interlocks and the isolating contacts.
6.2 Operating and signalling components
Figure 6
6.3
Instructions for circuit-breaker oper-
ation
Circuit-breaker operation can be either manual or electrical
(see fig. 6).
6.3.1 Loading the closing springs in manually loaded
operating mechanisms
Match the coupling position of the handle (provided) with the
hub(8)ontheloadingshaft,fully insert it on the shaft itself
and turn in a clockwise direction until the springs loaded
signal (yellow) appears in the window (7).
The force normally applied to the loading lever supplied is
130N.Inanycase,themaximumforceappliedmustnotex-
ceed 170 N.
6.3.2 Closing spring loading lever
Ifconnectedtotheelectricpowersupply,theoperatingmech-
anism will automatically load the springs and will signal when
the operation has been completed with a yellow indicator in
the window (7).
It is advisable to load one mechanism at a time to prevent ex-
cessive current from being absorbed in installations with sev-
eral motorized operating mechanisms.
Thefirsttimetheequipmentisputintoservice,itisadvisableto
load the closing springs in the manual mode to prevent several
operating mechanisms from starting to load at the same time
and overloading the auxiliary power supply.
6.3.3 Manual loading in operating mechanisms with
automatic loading devices
The automatic loading movement is released when the handle is
inserted: loading can now proceed as described in sect. 6.3.1.
Remove the handle after loading.
NOTE. If the motor starts during the manual loading opera-
tion, continue regardlesswith the operation until it has been
completed in the manual mode: the motor will stop as soon
as loading terminates. Neither remove nor insert the handle if
the motor is running. If the motor stops due to the ptotection
circuit-breakerhavingtripped,completetheloadingoperation
in the manual mode before closing the circuit-breaker itself.
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