Large low-voltage molded case and power circuit breakers may have electric motor operators so they can open and close under remote control.
2.
Miniature and molded-case circuit breakers are usually discarded when the contacts have worn, but power circuit breakers and high-voltage circuit breakers have replaceable contacts.
3.
"' 2007 "': Acquisition of HPM, No . 2 in electrical wiring devices in Australia, and Kontaktor, the leading Russian manufacturer of power circuit breakers.
4.
Power circuit breakers and medium-and high-voltage circuit breakers used for industrial or electric power systems are designed and tested to ANSI or IEEE standards in the C37 series.
5.
Further, this change is extremely rapid, " before " a circuit breaker can trip a few millisecond later . ( High-power circuit breakers are synchronized to the alternating current zero crossing to minimize arcing .)
6.
-- From April 20, 1999, to April 8, 2000, Alaska allegedly operated a Boeing 737 and two MD-80 jets with maintenance items improperly deferred, including a drain valve power circuit breaker and a stair light.
7.
General Electric ( not a party to this action ) and Westinghouse are the two leading U . S . manufacturers and sellers of heavy electrical equipment such as power transformers, power circuit breakers, hydroelectric generators, and gas and steam turbines.
8.
The agency also said that from April 20, 1999, to April 8, 2000, Alaska allegedly operated one 737 and two MD-80 aircraft with maintenance improperly deferred on items under its minimum equipment list, including a drain valve power circuit breaker and a stair light.
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