9
8
11
10
1
3
4
5
6
7
11
Key
1 Lever for manual
loading of closing
spring
2 Signaling device for
circuit-breaker open/
closed
3 Rating plate
4 Opening pushbutton
5 Closing pushbutton
6 Signaling device for
closing spring loaded/
discharged
7 Operation counter
8 Terminals
9 Earthing screw
10 Delivery terminal box
11 Wiring connection
Fig. 4
5.1. General information
VD4G are vacuum circuit-breakers for indoor
installation. Refer to technical catalog code
1VCP000661 for the relative electrical performance.
Please contact ABB for special installation
requirements.
The following versions are available:
• fixed
• withdrawable for UniGear ZS1 switchgear.
5.2. Regolatory framework
VD4G circuit-breakers conform to standard IEC/
IEEE 62271-37-013.
5.3. EL operating mechanism
VD4G circuit-breakers are equipped with an EL type
spring operating mechanism. The EL operating
mechanism is designed for the range of circuit-
breakers listed in the table.
Type of operating
mechanism
Breaking capacity
EL2
25 kA
EL1 TWIN
40 kA (up to 2000 A rated current)
EL2 TWIN
40 kA (≥ 2500 A rated current)
5.4. Fixed circuit-breakers
The fixed circuit-breaker (fig. 4) is the basic version
complete with structure and front protection shield.
Holes for fixing are made in the lower part of the
structure.
There are two types of connections for connecting
the auxiliary circuits (choice at customer’s charge
when the purchase order is placed) (see sect. 7.8.1).
The earthing screw is located in the rear part of the
circuit-breaker. See key to figure 4 for further
details.
—
5. Description
M ED I U M VO LTAG E PRO D U C T S
7