Bi-metallic sensor. Surface mounted. Control for boilers and wet central heating. Complies with EN 60730. Conforms to 89/336/EEC and 73/23/EEC. Specifications: Switch/contact rating: 4A Resistive. 2A inductive. SPDT. Temperature range: 40°-80°C. H x W x D: 85 x 45 x 55mm.