Disclosed is a plug power cord, which includes a plug including a main body, a live wire contact and a neutral wire contact, and a load wire. The load wire is connected with the live wire contact, and a protector is arranged between the load wire and the live wire contact, or, the load wire is connected with the neutral wire contact, and a protector is arranged between the load wire and the neutral wire contact.

A method for controlling a power strip includes: acquiring a present temperature parameter of an ambient environment; determining a presently-allowed maximum power of the power strip based on the present temperature parameter; acquiring a total power of electronic devices presently powered by the power strip; and controlling the power strip to cut off power supply to at least one of the electronic devices when the total power is greater than the presently-allowed maximum power. In the technical solution, the presently-allowed maximum power of the power strip can be adjusted automatically based on the present temperature parameter of the ambient environment of the power strip, which improves flexibility of adjusting the maximum power.

An overheating destructive disconnecting method for switch, whereby an operating member applies a first elastic force under normal conditions to enable the movable conductive member contacts a first conductive member and a second conductive member to form a conductive circuit; and a second elastic force to enable the movable conductive member to separate from the first conductive member or the second conductive member. The installation position of the overheating destructive member is used to receive heat energy instead of allowing current to flow thereto. When the overheating destructive member is destructed or deformed under a fail temperature condition, lessening or loss of the force applied by the first elastic force towards the movable conductive member causes the movable conductive member to no longer allow electrical conduction to the first conductive member and the second conductive member, thereby breaking the current-carrying circuit.

A varistor (50) comprising: a feed-through conductor (52) and a varistor disc (72) interposed between, and electrically connected to, conductor layers disposed on opposite surfaces of the varistor disc (72), the conductor layers being electrically isolated from one another; wherein the varistor disc (72) comprises a through aperture (60) through which the feed-through conductor extends; a first one of the conductor layers is electrically connected to the feed-through conductor; a second one of the conductor layers is, in normal use, permanently electrically connected to ground the varistor (50). This configuration enables one side of the disc (72) to be connected to the feed-through terminal, and the other side of the disc (72) to be connected to a ground plane, such as an earthed bulkhead of a wall or cabinet, via a metal plate forming part of the varistor (50) housing.

An apparatus for electrically connecting a first structural member and a second structural member is disclosed. The apparatus has a first mating connector assembly configured to be attached to the first structural member, the first mating connector assembly including a first neutral terminal ring, a second mating connector assembly configured to be attached to the second structural member, the second mating connector assembly including a second neutral terminal ring, a first neutral lead electrically connected to the first neutral terminal ring, and a second neutral lead electrically connected to the second neutral terminal ring. The first neutral terminal ring is slidably disposed adjacent to the second neutral terminal ring when the first mating connector assembly and the second mating connector assembly are in contact. A first wall member forming the first neutral terminal ring includes a first plurality of slits.

An electrical connector provided with a varistor, and to a protection device for incorporation into an electrical connector and having a varistor comprising at least two pins including a first pin which is a live (502) or neutral (504) pin and a second pin which is an earth pin (506), the first and second pins (502, 504, 506) extending through respective apertures (512) in a varistor plate (514) which has first and second faces, wherein a first conductive layer on the first face of the varistor plate (514) connects electrically to the first pin (502, 504) and a second conductive region on the second face of the varistor plate connects electrically to the second pin (506), so that in response to an excessive voltage across the first (502, 504) and second (506) pins the varistor plate will conduct electricity between the first (502, 504) and second (506) pins. The arrangement can easily be adopted in connectors conforming to existing standards, such as existing mains electrical plugs (500).

An electrical safety device is described which includes a socket arranged to receive an electrical plug of an electrical appliance to connect a current supply to the electrical appliance, a thermal sensor arranged to detect the surface temperature of an electrical plug when received in the socket and a processor in communication with the thermal sensor, the processor configured to determine when the sensed surface temperature exceeds a predetermined threshold. The invention also includes an electrical safety system comprising the electrical safety device configured to communicate with a remote device. The device and system provide early detection of electrical faults and hazards to reduce the risk of fires.

There is provided an adaptor device comprising a housing, a female electrical connector, a male electrical connector adapted to couple to a female electrical connector of the same type as comprised in the adaptor device, where parts of the housing form a part of the female electrical connector and a part of the male electrical connector, the device further comprising at least two leads in the housing from the male to the female connector such that the device can provide electricity to the female connector, and thereby to a male connector of a second device coupled to the female connector the adapter device further comprising a switch that can switch off the electricity provided in the leads, the device further comprising a heat sensing device, said heat sensing device comprising an IR sensor arranged in a space in the housing, said housing having an aperture for allowing IR radiation from the male connector of the second device to reach the IR sensor in the space of the housing, where the aperture is arranged in the female connector such that the aperture, when a male connector of a second device is coupled to the female connector of the adaptor device, is in close proximity to said male connector, where the heat sensing device is arranged to cause the switch to switch off the current to the female connector

A power connector includes an insulation body, at least two pins, a thermal conductive element, and a thermal sensor. The insulation body has a cavity and a first housing, and the first housing includes a plug-in surface. The pins pass through the first housing, and one side of the pins extends to the cavity. The thermally and electrically conductive element is disposed in the cavity and extends to the pins, and is spaced apart from the pins. The thermally and electrically conductive element is close to the first housing. The thermal sensor is disposed in the thermally and electrically conductive element.

An improved electrical power cord adapted to enhance the safety of an artificial lighted tree is presented. The electrical power cord has a three-prong safety grounded plug located at a first distal end of the electrical power cord, the plug electrically coupled to a multi-conductor cable comprising a neutral member, a hot member and a ground member. The electrical power cord also has a circuit protector connected in-line with the multi-conductor cable, the circuit protector including a fuse, or, a circuit breaker, having stationary and movable contacts operable between open and closed positions, and a manually operable reset button operably configured with the circuit breaker and electrically connected between said circuit breaker and the ground member for selectively actuating said circuit breaker for opening said movable contacts.