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US 3,941,963 AGranted
Circuit breaker
AssigneeHitachi, Ltd.
InventorsKouji Sasaki, Seizo Nakano, Tohru Tsubaki
Life of this patent
Estimating the term…
Abstract
In a circuit breaker having puffer type circuit breaking units housed within a tank of metal material, an inspection opening is formed in the tank side wall at a position opposite to a contact assembly in each of the circuit breaking units and is tightly closed by a detachable cover.
Claims6
A circuit breaker comprising:
- a tank of metal material filled with an arc extinguishing gas of a single pressure;
- at least two puffer type circuit breaking units disposed within said tank in series relation with each other and extending horizontally along the same axis, each of said breaking units including gas compressing means for compressing said arc extinguishing gas as soon as the breaking operation takes place, a nozzle of insulating material for guiding the compressed arc extinguishing gas, and a partible contact assembly detachably mounted to a main circuit conductor disposed within said tank;
- actuating means for actuating said gas compressing means and said contact assembly;
- an opening bored in the side wall of said tank at a position opposite to one of said contact assemblies, said opening having a diameter larger than the outer dimension of said nozzle;
- and
- a detachable cover tightly closing said opening.
3 more elements
Dependencies are inferred from the claim text.