Circuit breaker with positive contact indication

A circuit breaker having positive contact indication. Upon the circuit breaker tripping, the operating mechanism components unlatch, moving the cradle, upper link and lower link upwards and opening the contacts. Upon the circuit breaker being manually opened, no operating mechanism components move e...

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Bibliographic Details
Main Authors SCHIEFEN; DANIEL R, WINTER; JOHN M
Format Patent
LanguageEnglish
Published 09.05.1989
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC SWITCHES
ELECTRICITY
EMERGENCY PROTECTIVE DEVICES
RELAYS
SELECTORS
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Summary:A circuit breaker having positive contact indication. Upon the circuit breaker tripping, the operating mechanism components unlatch, moving the cradle, upper link and lower link upwards and opening the contacts. Upon the circuit breaker being manually opened, no operating mechanism components move except the upper link and lower link which causes the contacts to open. Upon the occurrence of locked contacts and the operating mechanism receiving a trip signal, the operating mechanism components unlatch but move only slightly since the contacts cannot open. A shuttle, pivotally mounted on the cradle, moves upward slightly to catch its tail on a flipper spring. The shuttle rotates slightly to meet a tab positioned on the handle arm and to block and opening movement of the operating handle.
Bibliography:Application Number: US19860922968