- Armoured heating elements to connect to the three phase net (3x400).- Double protection circuit to connect to the heater control circuit by means of a safety overheat automatic thermostat (60º), connected in series with another safety overheat manual reset thermostat (RESET).- Wiring box IP43.Available temperature sensors in the duct, ambient temperature sensors and speed controllers to complete the installation and to adjust the air temperature according to every need.By means of this system the supplied air can reach up to 50º.(See the electrical accessories section).