1. Charging

When the charging mechanism (11) is activated by hand or a motor(31), the charging shaft(11-1) of the mechanism turns by the gears and the driver(11-2) so that the closing spring is tensioned. When the closing spring is fully tensioned, the closing pawl(11-3) causes the closing spring to be latched.

2. Closing

When the closing signal is applied, the
closing spring is unlatched by the activation of the closing pawl. Energy is released from the discharging of the closing spring and the coupling bar is powerfully pushed down via the charging shaft and the cam (11-1). Consequently, the breaker shaft is turned until the moving contact is fully closed and latched by the trip pawl (25-1). At the same time, the contact pressure spring is compressed to insure sufficient contact pressure on the moving contact while the breaker is in the closed position, and the tripping spring (12) is compressed for the consequent opening operation.

3. Recharging

After the closing operation, the closing spring can be immediately recharged by a motor or by hand so that the breaker will immediately reclose if the closing signal is applied.

4. Opening

When opening signal is applied, the tripping spring is unlatched by activation of the trip pawl, and the breaker shaft is returned to the open position.