An electrical receptacle affording ground fault protection includes a movable latch block having spaced surfaces supporting the free ends of a pair of parallel, electrically conducting arms. The arms are anchored at their opposite ends and are held in a flexed position, with a pair of contacts mounted...http://www.google.de/patents/US4939615?utm_source=gb-gplus-sharePatent US4939615 - Latching and release system for ground fault receptacle
