9
10
4
5
2
6
1
3
11
7
8
VD4/R - VD4/L - VD4/R-SEC - VD4/L-SEC
- INSTALLATION AND OPERATING INSTRUCTIONS
8
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5. Description
5.1 General
VD4 series circuit breakers are devices under
vacuum for indoor installation. Please refer to the
corresponding technical catalogue code
1VCP000263 for the relative electrical
performance.
Please contact ABB for special installation
requirements.
VD4 series medium voltage vacuum circuit
breakers with lateral operating mechanism for
indoor installation feature the separate pole
construction technique.
Each pole houses a vacuum interrupter which is
encased in the resin when the cylinder is moulded
thanks to a special manufacturing process.
This construction method protects the vacuum
interrupter from shock, pollution and
condensation.
The operating mechanism is the EL trip-free
stored energy type with independent opening and
closing regardless of the operator’s action. The EL
operating mechanism is widely used in all VD4
series circuit breakers with frontal control.
The circuit breaker can be remote controlled when
fitted with dedicated electrical accessories
(gearmotor, opening and closing release).
The operating mechanism, the three poles and the
current sensors (if provided) are installed on a
metal frame without wheels.
The construction is particularly compact, sturdy
and of limited weight.
VD4 series circuit breakers with lateral operating
mechanisms are life-long sealed pressure devices
(Standards IEC 62271- 100 and CEI-EN 62271-100).
Additionally, VD4 series circuit breakers have been
type tested for low temperature and marine
applications (Germanischer Lloyd).
Figure 3
Key
1 Lever for loading the closing springs in
the manual mode
2 Circuit breaker open/closed indicator
3 Rating plate
4 Opening pushbutton
5 Closing pushbutton
6 Signalling device for closing springs
loaded/discharged
7 Operation counter
8 Terminals
9 Earthing screw
10 Delivery terminal box
11 Key lock (circuit breaker open) (*)
(*) Warning! To activate the key lock: open
the circuit breaker, keep the opening
pushbutton depressed, then turn the key
and remove it from the housing.
