First question : Talking a little theory about the thermomagnetic (thermal) keys. We know that it takes care of electrical installations due to overheating and short circuit. If we put a thermal of 63 amp. and 1.5 mm cables (we know that it is not the corresponding because the thicker cable would have to go. But it is only an example that I give nothing more) and together with neutral with phase a short circuit would occur and the thermal key, even if it were of 63 amp. It would be triggered because in theory there is talk that when there is a short circuit, the amperage tends to be infinite ... is that so or am I wrong ... Second question : because I tell you this, because I had made an installation for a friend in his house years ago where he had made three circuits with their respective thermal and differential switch .. lighting circuit with 1.5mm cable with its thermal of 10 amp. Tomás circuits of normal uses with 2.5mm cable with its thermal of 15 amp and finally Tomás circuit of special uses with 4 mm cable with its thermal of 20 amp .. but since it was in full construction the work was not finished but the main thing was already .. after time I learned that another electrician came (or if it could be called) to finish the job or put the thermal with their respective circuit but did something wrong, in the lighting circuit put the corresponding thermal We are doing well BUT in the other two circuits of normal use sockets and Tomás of special uses together and put a single thermal of 20 amp. for those two circuits .. totally wrong .. My friend's name is telling me that there was a short circuit between the plugs and the thermal one never jumped, made a blink but never jumped, I went to check his house and first I told him that what the other electrician did was wrong in joining the two normal use circuits and special in a single thermal knowing that each circuit carries its thermal .. that is why the thermal does not jump we made a short purpose to see if the thermal jumped and nothing just blinked .. my big question is why the THERMAL does not jump IF IN A SHORT CIRCUIT THE AMPERAGE TENDS TO BE INFINITY .. I UNDERSTAND THAT IT IS BAD WHAT THE OTHER ELECTRICIAN DID BUT BECAUSE IT DOES NOT JUMP THE THERMAL BY PRODUCING A SHORT CIRCUIT. THE THERMAL GOES WELL BECAUSE we took it out and made a short circuit and it acted but in the circuit where the sockets of normal and special uses are together, it does not jump, it does not act as a type of blinking. It may be that in the meantime the cable confuses the thermal ?????