Resettable circuit interrupting devices, such as GFCI devices, that include a reset lockout mechanism, an independent trip mechanism and reverse wiring protection. A conical reset plunger is notched to force a successful test before reset....http://www.google.ca/patents/US7098761?utm_source=gb-gplus-sharePatent US7098761 - Reset lockout mechanism and independent trip mechanism for center latch circuit interrupting device
