Description
9229 0025 176 0E
19
2021-11-15
Operating mechanism
The operating mechanism contains all the electrical and mechanical components re-
quired to close or open the vacuum circuit-breaker. Insulated operating rods transfer
the switching movement to the pole assemblies.
The operating mechanism is covered by the removable cover made from insulating
material (20.1) or metal (20.2).
Operating and display elements
There are openings in the covers for the operating and display elements.
Functions
The CLOSE pushbutton (56.1) is used to close the vacuum circuit-breaker. After
closing, the motor immediately recharges the closing spring. If the supply voltage for
the motor fails, the closing spring can be charged with a hand crank. For this pur-
pose, the covers contain an opening, behind which you will find the hand crank cou-
pling (57.2) of the gear unit.
To prevent electrical and manual closing, some designs of the vacuum circuit-break-
er can be fitted with a key-operated interlock (59.3).
Indicators
The charge state of the springs is indicated by the spring state indicator (55.1). The
position indicating device (56.3.) shows the CLOSED or OPEN switching state. The
operating cycle counter (58) indicates the number of performed operating cycles. An
operating cycle consists of one closing and one opening.
Fig. 15
Example of a control board with narrow cover
made of insulating material
Fig. 16
Example of a control board with wide metal
cover
0025-66
57.2
56.2
56.3
59.3
56.1
55.1
58
20.1
0025-05
57.2
56.2
56.3
56.1
55.1
58
20.2
59.3
20.1
Cover made of insulating material
20.2
Metal cover
55.1
Spring state indicator
56.1
CLOSE pushbutton
56.2
OPEN pushbutton
56.3
Position indicator CLOSED-OPEN
57.2
Hand crank coupling
58
Operations counter
59.3
Key-operated interlock (optional)