Abstract: A safety device to protect a piece of domestic electrical apparatus connected by means of a flexible supply lead to a plug to be attached to a conventional mains outlet. Between the pins of the plug and the exposed electrical working components of the apparatus is provided an on-off switch which will isolate the electrical operating components from the mains supply when the switch is in the "off" position. Sensor means are positioned within the piece of domestic electrical apparatus adjacent any exposed electrical components and control means for detecting a path of conduction between the sensor means and those exposed electrical components. Magnetically controlled release means including a permanent magnet and an electrically induced magnetic field in opposition thereto, preferably a DC motor provides movement when energized by the control means when the latter detect a path of conduction.