10
UniGear ZS1
I N S T A L L A T I O N , O P E R A T I O N A N D M A I N T E N A N C E
3.3.3 Withdrawable parts
1) Withdrawable circuit-breaker parts:
The withdrawable part of the UniGear ZS1
panel forms a complete module consisting of
the vaccum circuit-breaker type VD4 (Fig. 5,
6), an isolated contact arm with its associated
contact system and a control wiring plug.
The withdrawable assembly and the circuit-breaker
are coupled via a multi-pole control wiring plug
connector. The withdrawable assembly establishes
the mechanical connection between the panel and
the circuit-breaker. The fixed part of the assembly
is connected, on both sides, to the panel by
form-coded forking. The moving part with the
circuit-breaker is moved manually between the
service or test/disconnected positions - with
the front doors closed - by means of a spindle.
Auxiliary switches are used to register both the
selected position and the angular position of the
spindle.
The withdrawable part and the panel are earthed
together by means of an earthing system in the
panel.
Withdrawable parts with the same design are
interchangeable. In cases where the dimensions
are identical but the circuit-breaker fittings differ,
the control wiring plug coding (Fig. 16) prevents
incorrect connections between the withdrawable
part and the panel. Detailed coding information
is given in the relevant order documents.
2) Other withdrawable parts include:
•
The metering voltage-transformer truck with
fuses
•
The earthing truck without making capacity
(for the main busbar system and power
cables)
•
The power cable testing truck
•
The isolation truck
•
The metering truck
13.1 – Close pushbutton
13.2 – Open pushbutton
13.4 – Signaling device for circuit-breaker open/closed
13.5 – Operation counter
13.4 – Signaling device for closing springs charged/discharged
13.15 – Withdrawal part
28a – Lever for manually charging the closing springs
—
Figure 5 VD4 circuit breaker
—
Figure 6 VD4 circuit-breaker pole side
13.2
13.1
13.4
13.8
13.5
28a
13.15