Source google image: http://lycees.ac-rouen.fr/maupassant/Melec/co/Techno/Syst_indust/res/image_symb_dj_mgnth.png
Schema electrique relais thermique
Source google image: http://lycees.ac-rouen.fr/maupassant/Melec/co/Techno/Syst_indust/res/image_symb_dj_mgnth.png