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3 Description
18.14 Charging shaft
18.15 Damper for opening
18.17 Closing latch
18.17.1 Support lever
18.31 Mechanical closing interlock
18.4 Closing spring
Fig. 15 Function diagram of closing and opening latching:
Latching of the charged closing spring
As the closing process takes place, the charging motor is switched on. The charging of the closing spring is
repeated according to paragraph 3.7.1 Charging the Closing Spring.
Subsequently the charging shaft must be latched to top dead centre with the charged closing spring (Fig. 15).
Mechanical closing lock-out 18.31 prevents unintentional starting of the operating mechanism before the opening
cycle by blocking supporting lever 18.17.1 (see Fig. 15).
The closing and opening springs are charged and the circuit-breaker is consequently ready for an O-C-0
switching sequence.
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