What Size Circuit Breaker is Recommended for 8 Gauge Wire

Question:

Rewiring older travel trailer. I have a 40amp converter/charger going to an old style resettable breaker on an 8 ga wire. The wire from my battery to this is also 8 ga. 1. What size /type of breaker do I need 2. Can I mount it in my battery box, or does it need to be upstream charger side of both my battery and my TV pigtail also wired to charge my house batt.? Also the existing junction box needs to be replaced...any suggestions?

asked by: David B

Expert Reply:

The circuit breaker I recommend is the 40-amp circuit breaker # 9510, it is .66 inches long and may fit inside a junction box easier. However, the place I would mount it is between the charger and the battery on the trailer side.

The junction box I recommend is the Pollack # PK52249 as it provides neat, clean mounting point for multiple circuit breakers. The measurements are 7-1/2 inches long and 2-1/2 tall. See diagram to the right.

expert reply by: Chris B