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Metal Working

Gas-blast-circuit-breaker

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Gas-blast circuit breaker

Details

Inventors: Egli, Walter; Ragaller, Klaus; Schade, Ekkehard; Stelzer, Roland;
Assignee: BBC Brown, Boveri & Company, Ltd. (CH)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:

A gas-blast breaker with two contact members which are movable relative to one another. Each contact member is provided with a respective sparking contact. The contacts communicate with a cylindrical compression chamber whose volume varies as a function of the movement of the contact members and which is filled pressurized gas. A channel leading into a quenching zone between the sparking contacts extends into a first one of the two end faces of the compression chamber. A second one of the two end faces is bounded by a piston which is displaceable along the cylinder axis of the compression chamber and which is subjected to the action of a tensioned spring. The circuit breaker is suited for reliably interrupting both small and large currents, with a comparatively weak and simple drive mechanism for the movable contact member. The piston interacts with a fixed stop which is arranged such that the movement of the piston which is subjected to the action of the tensioned spring is blocked, below a predetermined first gas pressure in the compression chamber, against the movement of one of the contact members which is moved upon the occurrence of a breaking operation in the circuit breaker.

DETAILED DESCRIPTION It is the object of the present invention to provide a circuit breaker of the generic type, which can reliably interrupt both small and large currents and which is comparatively small and has a simple drive design for the movable contact member.
This object is achieved by the features given in the characterising clause of Patent Claim 1.
The circuit breaker according to the invention is distinguished by the fact that, in spite of a rather small size of the drive for the movable contact member, it has quantities of quenching gas available at a suitable pressure, which are sufficient for quenching both large and small switching arcs and are released according to the switching arc characteristics that are to be quenched.

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