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: Active control circuit: Incorporates 're-set' mechanism. Functions under normal conditions expected of an RCD, but will also trip in the event of a power cut or dramatic reduction in mains voltage. Ideal for use where rotating machinery / heat developing apparatus become energised after a power cut.