Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – With bimetallic elements
Patent
1988-11-14
1989-11-28
Broome, H.
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
With bimetallic elements
337 41, 337 43, H01H 7508, H01H 7512
Patent
active
048840491
ABSTRACT:
There is disclosed a circuit breaker overcurrent tripping device. This tripping device includes: a fixed iron core accommodating a bimetallic strip in which a flow of an electric current is present, the bimetallic strip bending when an overcurrent is present; a movable iron core attracted to the fixed iron core when the electric current becomes a short circuit accident current; a tripping mechanism operated both by the movement of the movable iron core or the bending of the bimetallic strip; a fixed contact point connected via a connecting wire to a load terminal; a movable contact point fixed to the movable iron core and connected via a conductor wire to a fixed end of the bimetallic strip; and a flexible conductor for connecting a free end of the bimetallic strip to the load terminal. In this configuration, the fixed iron core is wound with at least one turn of the flexible conductor, thereby increasing the magnetic force attracting the movable iron core to the fixed iron core. A shunt circuit is formed when the movable iron core contacts the fixed iron core, thereby reducing the current overload on the bimetallic strip, and preventing the bimetallic strip from damage.
REFERENCES:
patent: 3005066 (1961-10-01), Powell
patent: 3179767 (1965-04-01), Middendorf
Oyama Jun
Uchida Naoshi
Broome H.
Fuji Electric & Co., Ltd.
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