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5.5.
Withdrawable circuit-breakers
The withdrawable circuit-breakers are available for UniGear
ZS2 switchgear, PowerCube modules.
They consist of a truck on which the supporting structure of
the circuit-breaker is fixed.
Circuit-breakers for UniGear ZS2 switchgear
and PowerCube modules (fig. 5)
The cord with the connector (14) (plug) for connection of the
operating mechanism electrical accessories comes out of the
connection (15).
The strikers for operating the contacts (connected/isolated)
placed in the switchgear are fixed in the top part of the
circuit-breaker.
The slides (9) for operating the segregation shutters of
the medium voltage contacts of the enclosure or of the
switchgear are fixed on the sides of the circuit-breaker.
The crosspiece with the handles (17) for hooking up the
circuit-breaker for the racking-in/out operations by means of
the special operating lever (16) is mounted on the front part of
the circuit-breaker truck.
Caption
1 Lever for manually charging the closing spring
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 Isolating contacts
Fig. 5
9
The circuit-breaker is completed with the isolating contacts
(8).
The withdrawable circuit-breaker is fitted with special locks
on the front crosspiece, which allow hooking up into the
corresponding couplings of the switchgear. The locks can
only be activated by the handles with the truck fully resting
against the crosspiece.
The operating lever (16) must be fully inserted (also see
par. 7.5.). A lock prevents the truck from advancing into the
enclosure or fixed part when the earthing switch is closed.
Another lock prevents racking-in and racking-out with the
circuit-breaker closed. With the truck in an intermediate
position between isolated and connected, a further lock
prevents circuit-breaker closing (either mechanical or
electrical).
A locking magnet is also mounted on the truck which, when
de-energised, prevents the truck racking-in operation.
On request, an interlock is available which prevents racking-in
of the circuit-breaker with the door open, and door opening
with the circuit-breaker closed.
9 Slide for operating the switchgear shutters
10 Truck
11 Locks for hooking into the fixed part
12 Mechanical override of the undervoltage release (on request)
13 Strikers for activating the contacts placed in the enclosure
14 Connector (plug)
15 Cabling connection
16 Operating lever for circuit-breaker racking-in/out
17 Handles for activating the locks (11)
16
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