Description; General; Reference Standards; Fixed Circuit-Breakers - ABB VD4 Installation And Service Instructions Manual

5. Description

5.1.

General

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 1VCP000001.
For special installation requirements, please contact ABB.
The following versions are available:
– fixed
– withdrawable for UniGear ZS1 switchgear and PowerCube modules.
5.2.

Reference Standards

The VD4 circuit-breakers conform to the IEC 62271-100, CEI 17-1 file
1375 Standards and those of major industrialised countries.
5.3. EL operating mechanism
VD4 circuit-breakers are equipped with modular EL spring operating
mechanisms. The operating mechanism is designed to cover the whole
range of performances as shown in the following table:
Type of operating mechanism
EL1 - EL2
EL3
1
2
3
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 Earthing screw
10 Delivery terminal box
11 Cabling connection
12 Mechanical override of the undervoltage release (on request).
Fig. 4
Rated short-circuit current
Up to 31.5 kA
Up to 40 kA
11
4
5
6
12
7
5.4.

Fixed circuit-breakers

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.).
The earthing screw is placed in the rear part of the circuit-breaker. For
further details please see the caption to figure 4.
8
9
10
11
7