Siemens Aktiengesellschaft

Winfried Oltersdorf

Dieter Noack

An improved electric circuit breaker of the type comprising: a first hollow stationary contact element; a second hollow movable contact element, a third movable tubular contact element for connecting the first and second contact elements in the on condition of the breaker; and a piston-cylinder arrangement for providing a flow of quenching medium to quench the arc drawn between the contact elements. The improvement includes the further provision in such a circuit breaker of a spring means for causing, during the closing of the breaker, the second contact element to move to a first position whereat it is spaced at a first distance from the first contact element and a further means including a movable portion of the piston-cylinder arrangement for causing, during the opening of the breaker, the second contact element to move to a second position whereat it is spaced at a second distance larger than the first distance from the first contact element.

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Maintal, Germany

Winfried Oltersdorf