Abstract: An electric safety circuit for use with an electric receptacle includes a relay and contacts in which power from a mains is supplied through the contacts to the receptacle only when the contacts are closed; a transistor for controlling the relay to open or close the contacts; an enabling device for supplying an enabling signal to the transistor to close the contacts when a plug of an electrically connected device is inserted into the receptacle, the electrically connected device is turned on, and there is no electrical contact by a person with the power supplied to the electrically connected device; and a disabling device for supplying a disabling signal to the transistor to open the contacts when there is electrical contact by a person with the power supplied to the electrically connected device.

Abstract: An electric safety circuit for use with an electric receptacle includes a relay and contacts in which power from a mains is supplied through the contacts to the receptacle only when the contacts are closed; a transistor for controlling the relay to open or close the contacts; an enabling device for supplying an enabling signal to the transistor to close the contacts when a plug of an electrically connected device is inserted into the receptacle, the electrically connected device is turned on, and there is no electrical contact by a person with the power supplied to the electrically connected device; and a disabling device for supplying a disabling signal to the transistor to open the contacts when there is electrical contact by a person with the power supplied to the electrically connected device.

Abstract: An electric safety circuit for use with an electric receptacle includes a relay and contacts in which power from a mains is supplied through the contacts to the receptacle only when the contacts are closed; a transistor for controlling the relay to open or close the contacts; an enabling device for supplying an enabling signal to the transistor to close the contacts when a plug of an electrically connected device is inserted into the receptacle, the electrically connected device is turned on, and there is no electrical contact by a person with the power supplied to the electrically connected device; and a disabling device for supplying a disabling signal to the transistor to open the contacts when there is electrical contact by a person with the power supplied to the electrically connected device.

Abstract: A safety lightbulb includes a base, a glass envelope connected to the base, and electrical contacts extending from the base into the glass envelope and electrically connected to a filament for producing light in the glass envelope when current is supplied to the electrical contacts from a power source to which the base is connected. A safety arrangement in the base automatically electrically disconnects the electrical contacts from the power source when the glass envelope is broken, and includes an electrical contact member in the base and a moving/restraining arrangement in the base for moving the electrical contact members out of electrical contact with the power source and the electrical contacts, when the glass envelope is broken.

Abstract: A safety lightbulb includes a base, a glass envelope connected to the base, and electrical contacts extending from the base into the glass envelope and electrically connected to a filament for producing light in the glass envelope when current is supplied to the electrical contacts from a power source to which the base is connected. A safety arrangement in the base automatically electrically disconnects the electrical contacts from the power source when the glass envelope is broken, and includes an electrical contact member in the base and a moving/restraining arrangement in the base for moving the electrical contact members out of electrical contact with the power source and the electrical contacts, when the glass envelope is broken.