Electric circuit breaker

US4258239A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Dieter Noack · Berlin, DE
• Winfried Oltersdorf · Maintal, DE

Key dates

• Filing date: Jan 17, 1978
• Grant date: Mar 24, 1981
• Expiry date: Jan 17, 1998

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01H33/91
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

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.