Electrical safety device and system

An electrical safety system comprising:

• an electrical safety device comprising:
• 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 provide a contactless measurement of the surface temperature of the electrical plug when received in the socket, the thermal sensor comprising an infrared camera comprising an array of thermopile detector pixels;
• and
• a processor in communication with the thermal sensor, the processor configured to determine when the sensed surface temperature exceeds a predetermined threshold;
• and
• one or more remote devices;
• wherein the electrical safety device comprises a communications link and the electrical safety device is configured to send a signal to the remote device using the communications link when the processor determines that the surface temperature of the mains plug has exceeded the predetermined threshold.