@Mathieu I think it would be determined based on the settings of your ESC\VESC and the rest of your setup. I’ve never drawn more than 30A riding, and my motor’s max is 60A. I’m not sure if there is a benefit to using the lowest possible amperage. Perhaps the size? Cost?
yeah they are huge… but you can integrate them alright… and you can trim them down a fair bit too. its not an ideal solution but it is better piece of mind then a solid state switch and no parts to lose like a loop key.
I use 100A. on mine it seems to work well.
The problem with circuit breaker that always confuses me is that they have rated current and breaking capacity. These smaller ones are normally only thermal breaker and not magnetic / thermomagnetic breaker. Magnetic breaker can shut off quickly but that also bad for esk8 build as surges might occur if we hit an obstacle and you don’t want your board to be randomly shut off. On the other hand, the thermal breaker are more common, cheaper and can handle surges just fine as their breaking capacity is depending on current versus time. However the problem of thermal breaker is that they normally breaking at 3 - 4x their rated current. So for instance 20A rated breaker switch will break at 100A within 1 - 2 seconds.
Also within thermal breaker switch, rated current of 20A means that if it given 21A it will not break instantly. They will break after 10000 seconds (for instance).
I think you are missing the point @laurnts we are looking at using the breaker as a switch, we don’t particularly want it to trip at all. however the added safety of having it trip if there is a short is nice.
Seems unnecessary and bulky. Surely a small fuse is possible (as someone linked) and an antispark xt90s plug does the rest. I don’t bother with a fuse. What type of situation would it help? If the motor shorted it’s already ruined and in my experience without a fuse it it didn’t take the escs out as well and I kept adding amps
I originally used a breaker switch for my EBoard just like the one in @lowGuido picture, and I HATED it so much! First off the biggest problem was how physically big it is, so much so that I had to mount it on my board outside of the enclosure. After a lot of riding the thing started to fall apart, not only from the vibrations but from water damage. Eventually i was riding down the street on a brick road which is a horrible idea FYI, and the vibrations were bad enough that the pins holding it together fell out and the thing literally fell apart while I was riding it lol. Anyways point is I hated it so much and I wish I had originally just gone with a better quality switch like my MOSFET Switch im using now. One thing ive learned is dont be a cheap ass with EBoards, or electronics in general, because it never pays off and you just end up spending more money in the long run.
Personally I hate MOSFET switches I consider them dangerous because you can never really physically turn them off, only logicaly. I only will use a physical switch like a loop key or a breaker.
Which has been working on my board for over 2 years of hard riding now without falling apart.
Having said that I dont like how big they are, and they arent rated for more than 6S. So… not the best solution.
The automotive 80-100 amp breakers are fine at 6s, anything over and they don later long. If you want to go the XT-90s route you can get and XT-90 panel mount and XT-90 cap and keyring cover…Looks good.