Siemens 3AH Installation Operation & Maintenance - Page 16

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Vacuum Interrupter/Operator Description

Rapid auto reclosing.

The closing spring is recharged automatically as described

above. Therefore, when the circuit breaker is closed both its

springs are charged. The closing spring charges the opening

spring during closing. As a result, the circuit breaker is

capable of an O-3s-CO-15s-CO operating cycle.

Figure 8. Operator Sequential Operation Diagram.

The dashed line shows the operating sequence

initiated by impairing the closing command.

Anti-pumping feature (Divice 52Y)

Care must be taken to see that a continuously ap-

plied closing command does not cause the circuit

breaker to reclose after it has tripped out on a fault

otherwise it may sustain damage by the "pumping"

effect.