Patent classifications
H
ELECTRICITY
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H01
ELECTRIC ELEMENTS
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H01H
ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
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9/00
Details of switching devices, not covered by groups H01H1/00 - H01H7/00
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H01H9/54
Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
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H01H9/56
for ensuring operation of the switch at a predetermined point in the AC cycle
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H01H9/563
for multipolar switches, e.g. different timing for different phases, selecting phase with first zero-crossing
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