Masterseal range has been specifically designed for use either outdoors or indoors and in areas heavily exposed to dust and splashing water. Standard BS 13A 3 pin plugs can be used in sockets maintaining IP56 rating. Specifications: Passive control circuit: Incorporates stay set mechanism. Is mains failure proof, ie will function under normal RCD conditions but will not trip in the event of power cut. Ideal for freezers or inaccessible or unmanned locations.