| 摘要 |
Disclosed is apparatus for selectively allowing the actuation of a predetermined number from a plurality of electrical switching devices in an electrical system. Disclosed is an electrical system that requires, as an example, the selection of one of a plurality of power sources to a load. For overload protection, an electrical switch such as a circuit breaker is connected between each power source and load. The present invention cooperates with the circuit breakers to provide fail-safe protection by permitting one and only one circuit breaker, and thus power source, to be actuated at any one time. The apparatus comprises a slide member whose geometrical configuration allows it to be positioned over a circuit breaker only when the handle of the circuit breaker is in its OFF (unactuated) position. By utilizing a side-to-side configuration of circuit breakers, the slide members may be mounted on a pair of guide rods which extend longitudinally across all the circuit breakers in the system. The guide rods allow the slide members to be selectively positioned over those circuit breakers which are desired to remain in an unactuated position. By providing one less slide member than are provided electrical circuit breakers, only one of said circuit breakers will be left exposed to manual accessibility, thus allowing it to be manually switched to either of its two operating positions. Thus, the slide members of the present invention effectively combine the functions of power source selection and overload protection to make them mutually dependent.
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