The electro-thermal link is for installing in a position where a fire hazard may occur, e.g.
above a burner of an air heater or boiler. The fire will melt the fusible metal link and interrupt the electrical supply to either a gas valve or alarm etc. The link consists of a purpose built steel box with a perforated cover having a temperature sensitive fuse. The unit should be mounted so that the perforated cover faces downwards and ventilation holes in the sides must not be obstructed.

Specification :
The link is electrically rated at 5 amps maximum on 200/250 V, single Phase, 50 Hz and melts at 155°F (68°C). Dimensions : L 75 x W 50 x D 30 mm, complete with 20 mm conduit entry in one end.