An electrical protection device

摘要

An electrical protection device for a load having an external conductive surface; two input terminals connecting to active and neutral conductors; two output terminals connecting to the load, the load drawing a load current; a first monitoring unit responsive to the load current flowing in the active conductor and the neutral conductor and generating a first fault signal; a second monitoring unit generating a second fault signal in response to either or both of: current flowing from the surface; and the voltage between the surface and the neutral conductor and/or the earth; a protection unit normally connecting the input to output terminals allowing load current to flow from source to load via the protection device, and responsive to either of the first fault signal and the second fault signal for operating in a protected state to electrically isolate the input terminals from the output terminals and preventing flow of the load current.