The invention refers to a method and an apparatus (1) for protecting people against leakage currents while using appliances such as home appliances or the like. The apparatus (1) is provided with a differential switch (20) normally open and a differential current transformer (39) which generates a signal...http://www.google.ca/patents/US7636224?utm_source=gb-gplus-sharePatent US7636224 - Method and safety device for ground fault circuit
