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3 Description
3.6 Spring Drive Mechanism of the Circuit-Breaker
This section contains a general presentation of the spring drive mechanism; see the 3D illustration on the foldout
page at the end of these operating instructions. Its function is described in section 3.7 Function of the Spring
Drive Mechanism.
3.6.1 Charging the Closing Spring
Circuit-breaker in OPEN position
The closing spring 18.4 (see 3D illustration at the end of these operating instructions) is charged by the charging
gears 18.2 using the motor 18.1 byway of the charging shaft 18.14 and connecting rod 18.10. At the end of the
charging operation, the charging shaft is separated from the gears by the free-wheel 18.3 and secured with the
CLOSE latch 18.17. The closing spring 18.4 is now charged for the closing operation and the circuit-breaker is
therefore ready for closing.
3.6.2 Closing
The closing latch 18.17 is released by actuation of the trip coil 18.16. The energy of the discharging closing spring
18.4 is transmitted via the cam plate 18.6 to the lever 18.7 and the operating shaft 18.22 connected to it. In the
process, the opening spring 18.11 is charged by means of the rotation of the operating shaft 18.22, the operating
lever 18.24 and the connecting rod 18.27. The movement of the connecting rod 18.27 along the operating
mechanism rod 15.9.1, the torque shaft 15.8 and the operating rod 16.9 is transmitted to the centre interrupter
unit 22. At the same time, the contacts of the interrupter units 22 are closed.
On completion of the closing operation, the residual kinetic energy is absorbed by closing damper 18.41. Cam
18.19 and roller 18.41.1 prevent backward swinging of charging shaft 18.14.
Lever 18.7 is simultaneously engaged with OPEN latch 18.9. The pole is now in a CLOSED position and can thus
be switched off.
The closing spring 18.4 is then completely recharged in less than 15 s. A mechanical lockout prevents switching
back on of the operating mechanism before the opening operation.
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