ABB hd4 Installation And Service Instructions Manual page 11

The strikers for activating the contacts (connected/isolated),
located in the enclosure or in the switchgear, are fixed in the
top part of the circuit-breaker. The slides for activating the
segregation shutters of the medium voltage contacts of the
enclosure or switchgear are fixed on the sides of the circuit-
breaker. The crosspiece for hooking the circuit-breaker for
the connection/isolation operation by means of the special
operating lever is mounted on the front part of the circuit-
breaker truck.
The circuit-breaker is completed with the tulip isolating
contacts. The withdrawable circuit-breaker is fitted with
special locks, on the front crosspiece, which allow hooking
into the corresponding joints in the enclosure or fixed part.
The locks can only be activated by the handles with the truck
resting completely on the crosspiece.
Withdrawable circuit-breaker
Fig. 5
Caption
1 Signalling device for state of SF6 pressure (on request)
2 Opening push button
3 Closing push button
4 Operator counter
5 Signalling device for circuit-breaker open/closed
6 Shaft for manual closing spring charging
7 Signalling device for closing springs charged/discharged
8 Characteristics nameplate
9 Isolating contacts
The activating lever (connection/isolation) must be fully
inserted. A lock prevents the truck from advancing into the
enclosure or fixed part (for example when the earthing switch
is closed). With the truck in the middle position between
isolated and connected, the lock prevents closure of the
circuit-breaker (both mechanical and electrical).
On request, a locking magnet can be mounted on the truck
which, when de-energised, prevents truck operation.
5.5. Enclosures and fixed parts
For information about the enclosures and fixed parts, please
consult the relative documentation.
10 Pressure switch (on request)
11 Valve for checking the SF6 gas pressure
12 Slide for activating the enclosure shutters
13 Truck
14 Locks for hooking into the fixed part
15 Lock activating handles (17)
16 Strikers for activating the contacts located in the enclosure
17 Connector (plug)
18 Resetting button for protection circuit-breaker of geared motor (on request)
10 - 11 (36 kV)
11