Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1973-12-03
1976-12-07
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
92 47, 200 83C, 92 34, H01H 3366
Patent
active
039964370
ABSTRACT:
A vacuum contactor for motor control applications and method of making the same that produces a switch of minimum size and extremely long mechanical life. This method comprises the step of heating the vacuum assembly to not over 450.degree. C during the evacuation process thereby allowing use of welded diaphragm bellows having the attendant advantages of much smaller size and longer life for a given length of stroke as compared to formed bellows. Because the operating conditions for motor control applications do not require as high voltage and current breakdown levels and thus the residual gas level inside the vacuum contactor enclosure need not be as low as in the case of circuit breaker (interrupter) applications, limiting the heating to not over 450.degree. C allows use of AM-350 stainless steel welded diaphragm bellows without sacrificing its required mechanical life. Furthermore, the bellows shield is designed to achieve minimum current chopping and at the same time maintain high current interruption capabilities. Two types of vacuum switch configurations made according to this method are disclosed.
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Autio William A.
Cutler-Hammer, Inc.
Macon Robert S.
Rather Hugh R.
Taken Michael E.
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