Ellenberger & Poensgen Gmbh

Erhard Pietsch

Fritz Krasser

An overload protection switch having a push button for manually initiating actuation of the overload protection switch and a movable contact member forming a switching path and having at least one fixed contact. There is a lockable trip mechanism actuated by the push button for controlling the movable contact member during actuation of the overload protection switch and a bimetal element which includes a locking lever pivotal into a locking position and pivotal into its unlocking position. A trip slide is articulated to the movable contact member and is charged in a turn-off direction. The trip slide is additionally supported in its path of movement by a housing groove at a counterslope fixed to the housing. An essentially wedge-shaped inner angle is formed to reduce friction forces at the locking lever and produce a lower tripping force at the bimetal element.

Overload protection switch

A multi-pole excess current circuit breaker assembly has a plurality of single-pole circuit breakers. In each of the latter the electric contacts are openable by a spring-loaded tripping mechanism actuated by a release lever as the release lever is moved from a first position to a second position by an excess current responsive device. The actuated tripping mechanism moves the release lever from the second position to a third position. The release levers of all the single-pole circuit breakers are operatively interconnected by a one-piece coupling member which is fixedly attached to one of the release levers, but is coupled to the others with a clearance, so that when excess current flows through the contacts of one of the single-pole circuit breakers, the release lever of the latter will move the release levers of the other single-pole circuit breakers only when it is displaced from the second position to the third position by the tripping mechanism of that single-pole circuit breaker through which the excess current flows.

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Winkelhaid, Germany

Erhard Pietsch