ABB VM1 Installation And Service Instructions Manual page 13

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M E D I U M V O LTA G E P R O D U C T S

6.3. Basic structure of the with-

drawable circuit breaker

The withdrawable truck (4) (fig. 8), either manual

or motorised, consists of a steel sheet structure

with wheels (3), on which the circuit breaker with

the relative auxiliary components, the isolating

contacts (2) for electrical connection with the

switchgear and the multi-pole connector (1) for

connection of the circuit breaker auxiliary circuits

are installed.

After having been racked into the switchgear and

hooked up, the withdrawable circuit breaker can

take up the following positions: racked-out,

isolated for test (with connector inserted) and

racked-in. The racked-in circuit breaker is

automatically earthed by means of the truck

wheels. The magnetic actuator of the circuit

breaker and the relative controls and indicators,

are accessible from the front. Withdrawable

circuit breakers of the same type and

characteristics are interchangeable. However, the

code of the connector prevents incorrect

combinations between the circuit breaker and

switchgear.

Fig. 8

Vm1 12 Vm1 17 Vm1 24