| 摘要 |
PROBLEM TO BE SOLVED: To secure stable contact of the auxiliary switch contact point and to prevent deformation caused by high temperature creep of the auxiliary switch drive lever incorporated in the circuit breaker in the shortage voltage tripping device having a fast-in auxiliary switch attached to the circuit breaker. SOLUTION: This is a shortage voltage tripping device which comprises a tripping electromagnet 13 and a fast-in auxiliary switch 14 inserted in the current flowing circuit, and in which, after connecting the contact point holder 14c of the auxiliary switch to the operating handle of the circuit breaker, the fast-in auxiliary contact is inputted in the ON operation of the circuit breaker. The bottom end of the contact point holder 14c is axially supported to the spindle 14d and the operating lever 14c-1 drawn out from the top end to the side way is engaged with the top end arm part 16b of the drive lever interlocked with the operating handle of the circuit breaker, and a reversing spring 18 as a return spring of the contact point holder is provided at the top end side of the holder and energizes the contact point holder to OFF side at the OFF position of the handle, and energizes the contact point holder to ON side by reversing operation, when the contact point holder is driven to the ON position by the handle operation.
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