Japanese Patent JPS5346568

U

An improved puffer-type, compressed-gas, circuit-interrupter is provided having an improved separable contact structure with resilient stationary contact fingers biased inwardly upon the movable tubular venting arcing contact, the latter moving with a movable operating cylinder over a relatively-fixed piston structure, and carrying an insulating nozzle therewith. The movable tubular venting arcing contact is disposed upstream of the movable nozzle structure, and does not impede the gas flow through the nozzle structure, as generated by the relative movement of the operating cylinder over the relatively-fixed piston structure. Preferably, the relatively-stationary resilient contact fingers, are encircled by a tubular venting stationary contact support, being fixedly secured thereto, the arrangement functioning to cause contact interengagement between the stationary resilient contact fingers and the movable tubular arcing venting contact, so that upon circuit-interrupter opening movement, an arc is established between the forward tips of the resilient stationary contact fingers and the upper extremity of the movable tubular venting arcing contact. Double gas-flow occurs through both the stationary and movable tubular venting contacts, and yet the constricted portion of the insulating hollow movable nozzle may be increased only slightly by the relocation of the contact fingers to the stationary supporting portion of the interrupter. Additionally, the elimination of the usual upstream movable finger-cluster obstruction allows a corresponding reduction in the size and mass of the moving cylinder supporting spider.

JP12635577U

April 20, 1978

September 21, 1977

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H01H33/91; H01H33/915; (IPC1-7): H01H33/91

JPS4916866A	1974-02-14
JPS4930876A	1974-03-19

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