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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77/00
Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
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H01H77/02
in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
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H01H2077/025
with pneumatic means, e.g. by arc pressure
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