THERMAL CUT-OUT DEVICES FOR RADIANT HEATERS

摘要

A thermal cut-out device for a radiant heater comprises a probe-type thermally responsive assembly (2), at least a part of which is coated with and/or is surrounded by a radiation reflective material. The probe-type assembly may comprise a first element (3) in the form of a rod of material having a relatively high coefficient of thermal expansion and a second element (4) in the form of a tube of material having a relatively low coefficient of thermal expansion. The rod may be coupled to a snap-acting switch assembly (1). One or both of the first and second elements may be coated with or surrounded by the radiation reflective material. Alternatively the tube which surrounds the first element may be made of the radiation reflective material. The radiation reflective material may comprise a metal such as gold or a suitable element from Group VIII of the Periodic Table or may comprise a high temperature resistant particulate material such as aluminium oxide, magnesium oxide, titanium dioxide or tin oxide.