Review on ⚡️ Bussmann CBC-20B Circuit Breaker: Type I Heavy Duty Automotive with Stud Terminals and Bracket - 20 A (1 Pack) by Will Schimmel

My towbar's 7 pin plug is rated at 30A. But the trailer wiring is much thinner. So I installed this circuit breaker between my truck's relay and the hitch. This way the trailer will shut down if it wants to charge more than 20A and after a while it will restart and charge again. This means that the main fuses in the truck do not burn out. (which are used once and need to be replaced) So far it has only worked twice when the trailer battery was very low. It usually charges around 5-10A. Another insurance. Maybe pack another one in the trailer if I use another vehicle with more power.