Electronic circuit ensuring protection against electrical discha

Details Electronic circuit ensuring protection against electrical discha Electronic circuit ensuring protection against electrical discha

1986-08-19

1988-03-29

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

219369, H02H 908

Patent

active

047348224

ABSTRACT:
An electronic safety device, for example for the current feed of a hairdryer or similar domestic electrical appliance, shuts off the appliance in the presence of moisture or water on electrically conducting parts thereby avoiding a dangerous short circuit. A pair of closely spaced grids is provided, each of which is in series between a pair of connection wires that trip a control circuit which normally maintains energized a relay for closing a control switch of an electrical feed line of the appliance. A supplementary control current continuously flows through each grid and its associated wires.

REFERENCES:
patent: 3525902 (1970-08-01), Davidson et al.
patent: 4270158 (1981-05-01), Gilardoni et al.
patent: 4464582 (1984-08-01), Aragaki et al.
patent: 4550358 (1985-10-01), Crowley et al.

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