Earthing switch
Each cable panel can be fitted with a short-circuit-proof
earthing switch fitted to the cable side. The earthing
switch connects the connection points of the cable with
the earthing busbar. A mechanical interlock ensures that
the earthing switch is always open when the circuit
breaker or contactor unit is in the connected position.
The earthing switch can be closed only with the circuit
breaker or contact unit is in the Test / Disconnected
position or completely removed.
The earthing switch can be locked with a padlock.
Special locks are used in some installations, e.g. with the
aid of a locking coil.
2.1.9 Withdrawable units
Power Xpert
®
UX switchgear can contain a variety of
switching/measuring equipment in circuit breaker
compartment
Withdrawable circuit breaker unit
The circuit breaker is the W-VACi.
W-VACi circuit breakers are provided with vacuum
interrupters. This assembly is mounted on a switch
cradle and racking mechanism.
Electrical control signals are supplied from the low-
voltage compartment via a 58-pole secondary plug.
Mechanical and electrical interlocks prevent unintentional
switching.
Refer to separate Operations and Maintenance Manual
for the Circuit Breaker.
Withdrawble contactor unit
The vacuum contactor is ideal for controlling applications
requiring a high number and frequency of switching
operations and for AC motors. The contactor basically
consist of a moulded resin monobloc, where the vacuum
interrupters, moving apparatus, control electromagnet,
multi-voltage control feeder and auxiliary accessories are
housed.
Refer to separate Operations and Maintenance Manual
for the Contactor
Withdrawable Voltage Transformer unit
The Voltage transformer mounted on a withdrawable
cradle with integral racking mechanism is used to
measure the voltage of the busbar or cable side
depending on configuration.
Refer to separate Operations and Maintenance Manual
for the Withdrawable Voltage Transformer Unit
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