| 摘要 |
PROBLEM TO BE SOLVED: To efficiently emit heat generated from a component in a casing to the outside to improve operation reliability of a circuit breaker. SOLUTION: This circuit breaker is equipped with: a mechanism system for switching a fixed-side conduction terminal and a movable-side conduction terminal; and the casing used for housing the mechanism system and having a fin-like heat radiation part formed on its outside surface; and is characterized by that the fixed-side conduction terminal is disposed at one end of the fin-like heat generation part, and the other end opposite to the one end is opened. An arc runner connected to the back surface of the fin-like heat generation part, or an L-shaped heat-transmitting member formed in close contact with the back surface of the fin-like heat generation part may be fixed to the fixed-side conduction terminal. COPYRIGHT: (C)2005,JPO&NCIPI
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