CIRCUIT BREAKER FOR ELECTRIC POWER

摘要

PROBLEM TO BE SOLVED: To provide an operating device of a circuit breaker being miniaturized or enlarged by improving energy efficiency of a spring as a driving source of the circuit breaker. SOLUTION: A contact of a breaking part is opened or closed by radiating bending strain energy accumulated by deflecting an elastic member fixed at one end as a breaking spring and an introduction spring. The elastic member is a uniform strength beam having changed cross section so as to have substantially uniform bending stress on all cross sections or a laminated spring.