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The Redarc CBK30-EB TowPro Circuit Breaker Kit wires a 30-amp breaker into the power feed between your tow vehicle's battery and a Redarc electric trailer brake controller. It's built for three-axle electric brake setups and comes with most of the fiddly work already done.
Redarc recommends soldering the crimped joints after crimping for the most reliable electrical connection.