Circuit interrupting device

Details Circuit interrupting device Circuit interrupting device

1981-02-17

1983-05-17

Grimley, A. T.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200 6108, 200148F, H01H 3370

Patent

active

043841856

ABSTRACT:
A high-voltage circuit-interrupting device includes a replaceable container of pressurized arc-extinguishing fluid. A fluid port of the container is closed by a puncturable seal. When an overcurrent occurs in the circuit, the seal is punctured before interrupting contacts of the device open so that the fluid is already flowing when an arc forms between the contacts. Overcurrents are sensed by either a fusible element or a current transformer. Fluid flow before contact opening is achieved by mechanical facilities responsive to the melting of the fusible element or the output of the transformer. The entire device--including the container, the overcurrent sensor and the mechanical facilities--is at the voltage of the circuit.

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