Siemens 3AH4, Operating Instructions Manual

Page: 19 / 66

Description
9229 9862 176 0D 19
2013-08-28
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 CLOSE 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).
Indicators The charged state of the springs is indicated via the spring state indicator (55.). The
position indicator (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. 21 Operating and indicator elements
50.1 Opening for hand crank 58. Operating cycle counter
51. Rating plate 59. Position indicator CLOSED-OPEN
53. CLOSE pushbutton 60.1 Cover
54. OPEN pushbutton a) Tightening torque Md = 10 Nm
55. Spring state indicator