Description
9229 9947 176 0C
17
2013-03-28
Contact system in the vacuum interrupters
A slight change in the contact stroke that occurs over the entire useful life of the
vacuum interrupter has no effect on its function. There is no need for a status
indicator for the contact system.
Mechanism box
The mechanism box (60.) contains all the electrical and mechanical components
required to switch the vacuum circuit-breaker on or off. Insulating operating rods
(48.) transfer the switching movement to the pole assemblies.
The mechanism box is closed with a removable cover (60.1).
There are openings in the cover (60.1) for the operating and indicator elements.
Functions
The CLOSED pushbutton (53.) is used to close the vacuum circuit-breaker. The
motor (50.4) immediately charges the closing spring (62.). If the supply voltage for
the motor fails, the closing spring can be charged with a hand crank (50.). There is
an opening (50.1) for this in the cover, behind which you will find the hand crank
coupling (50.5) of the gear unit (50.2). The OPEN pushbutton (54.) is used to open
the vacuum circuit-breaker.
Indicators
The charged state of the springs is indicated via the spring state indicator (55.). The
position indicating device (59.) shows the CLOSED or OPEN state. The operating
cycle counter (58.) indicates the number of operating cycles. An operating cycle
consists of one closing and one opening. The rating plate (51.) is attached to the
mechanism box and readable through an opening (51.1) in the cover.
Fig. 19
Operating and indicator elements
50.1
Opening for hand crank
58.
Operating cycle counter
51.
Rating plate
59.
Contact position indicator CLOSED-OPEN
53.
CLOSED pushbutton
60.1
Cover
54.
OPEN pushbutton
a)
Tightening torque Md = 10 Nm
55.
Spring state indicator
