1
2
3
4
5
6
7
9
10
Fig. 4
The VD4 series of circuit-breakers are pieces of apparatus
under vacuum for indoor installation. For the electrical
performances, please refer to the corresponding technical
catalogue code .
For special installation requirements, please contact ABB.
The following versions are available:
– fixed
– withdrawable for UniGear ZS2 switchgear and PowerCube
modules.
5.2.
The VD4 circuit-breakers conform to the IEC 62271-100,
CEI 17-1 file 1375 Standards and those of major industrialised
countries.
Reference Standards
Caption
1 Lever for manual closing spring charging
2 Signalling device for circuit-breaker open/closed
3 Rating plate
4 Opening pushbutton
5 Closing pushbutton
6 Signalling device for closing spring charged/discharged
7 Operation counter
8 Terminals
9 Cabling connection
10 Mechanical override of the undervoltage release (on request)
5.3. EL operating mechanism
VD4 circuit-breakers are equipped with modular EL spring
operating mechanisms. The operating mechanism is
designed to fulfill desired performance specification as
shown in below table.
Type of operating mechanism
Rated short-circuit current
EL3
Up to 31.5 kA
The fixed circuit-breaker (fig. 4) is the basic version complete
with structure and front protection screen. The fixing holes are
made in the lower part of the structure.
For the electrical connections of the circuit-breaker auxiliary
circuits, the terminal box (10) is available (also see par. 7.8.1.).
5.4. Fixed circuit-breakers
8
9
5.1. General
5. Description
6
