Patent ID: 6483420
Filing Date: 2002-11-19
Classification: H01H

Abstract:
A circuit breaker comprising:a first breaker including: a first connecting terminal connected to a power source; a second connecting terminal connected to a load; a movable conductive member coming into electrical contact with both said first and second connecting terminals; wherein said movable conductive member is moved into a position to interrupt the electrical connection between said first and second connecting terminals by an interrupting signal which is input to said first breaker in an abnormal condition; and a second breaker including a notch which is filled with a fusible conductor formed on a portion of at least one of said first and second connecting terminals, wherein said fusible conductor in said notch is blown out due to heat caused by a current flowing through said at least one of said first and second connecting terminals, wherein said second breaker is activated to interrupt the electrical connection between said first and second connecting terminals in case of a failure of said first breaker during the abnormal condition.