Circuit breaker overcurrent tripping device

Details Circuit breaker overcurrent tripping device Circuit breaker overcurrent tripping device

H - Electricity

01

H

306/59

H01H 73/48 (2006.01) H01H 71/48 (2006.01)

Patent

CA 1301222

ABSTRACT OF THE DISCLOSURE: There is disclosed a circuit breaker overcurrent tripping device. This tripping device includes: a fixed iron core accom- modating a bimetallic strip in which a flow of an electric cur- rent 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 cur- rent; 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 con- nected 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 flexi- ble 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.

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