Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1992-03-23
1993-11-09
Scott, J. R.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200 16A, 200243, H01H 3302, H01H 120, H01H 902
Patent
active
052605310
ABSTRACT:
An electrical switch and switch contact are disclosed, both of which are advantageous for use in an environment containing explosive gases or vapors. The switch housing is designed so that the two joints where explosive gases or vapors can enter or exit into the switch interior can cool any hot gases escaping from the switch interior. Therefore, if any explosive gases or vapors are ignited by an arc in the switch interior, they are cooled during their exit from the switch, so that they cannot ignite the explosive environment outside the switch. This is done using a labyrinthine path between the two switch housing members, and a lengthy metal-to-metal, metal-to-ceramic, or ceramic-to-ceramic path between the switch actuator and the switch housing. The contact is designed such that it has a greater flexural length, without requiring a substantial increase in the housing body volume. This allows a smaller amount of hazardous gas or vapor to come into contact with a potential arc. The contact design allows a good degree of overtravel and a contact cleaning action, both of which contribute to the reliability of the electrical connection made by the switch.
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Bartlett Paul J.
Yarbrough Garrett S.
Cooper Industries
Scott J. R.
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