I assemble electric bikes, some systems get hot, so in order not to worry about blowing the 20A fuse, I started using this kind of breaker. the 80 volt and 20 amp magnetic switch is really compact, I use a Q-Tip travel kit box for my switch box; ) The real plus is that this system can be easily connected to a single pole so it runs great from the battery to the motor controller on my bike, and a double plus: I no longer have to carry fuses around. it is well made and works perfectly. I've used…