To provide a switch of smaller size, and improved economy and reliability, which is assembled in a power supply circuit of an electric equipment of a low-voltage contract consumer.
A polymer switch element 20 of which a resistance varies reversibly according to changes in temperature, is laminated with a heating body 30 for heating the polymer switch element 20 so that it switches from a conductive state to a non-conductive state. A polymer switch 10 is integrated with the element 20 and the body 30. The polymer switch element 20 of a normal temperature is a low resistance body in conductive state to switch on normally, but energizes the heating body 30 as required for self-heating when abnormality occurs, so that the polymer switch element 20 switches off. If an overcurrent rushes in the polymer switch element 20 at a normal time, the overcurrent heats the polymer switch element 20 itself to suppress the overcurrent.
SHIMOJIMA YASUHIRO
WAKAHATA YASUO
Hideka Tanaka
Yoshiyuki Shiraishi
Kunihiko Shiromura
Tsuyoshi Kumano
Hiroaki Yamane
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