Historically auto-resetting circuit breakers have been the standard circuit protection for use with electric trailer brake controllers. Auto reset circuit breakers were adopted so that faults in the wiring on the trailer (which are the majority of faults) would trip the circuit breaker but as soon as the trailer was disconnected, or the fault rectified, the auto reset function would restore the power to the electric trailer brake controller ready for next time a trailer was connected.
The circuit breaker protected the system (from battery to trailer brake) in the event of a wiring fault such as a short circuit to ground on black, blue or red wires on the diagram.
The advanced features of the REDARC Tow Pro Elite (EBRH-ACCV3) limits the current on the wires and permit the use of a 25-amp inline fuse as an alternative.
Traditionally the circuit breaker was the only protection for the wiring from the main battery supply through to the trailer’s electric brakes.
In the event of a short circuit fault in the trailer wiring, the breaker would ‘open’, cutting the power feed. After a short delay (seconds) the breaker would then automatically ‘close’, reapplying power. Whilst the fault persisted, the circuit breaker cycled. If the fault was removed (i.e. the trailer disconnected or the fault repaired) the system would return power to the electric trailer brake controller without any other direct action (replacing fuses, etc).
The advanced protection technology in the Tow-Pro Elite performs a similar function and alerts the driver. If an overload or short condition is detected on either the red wire or the blue wire, the Tow-Pro will limit the input current whilst flashing a fault code via the remote head LED to alert the driver. The Tow Pro will continually attempt to apply power to the electric brakes during vehicle braking.
A fuse or circuit breaker still needs to be installed at the starting battery to protect the black wire on the diagram between the battery and the Tow Pro main unit, however it no longer needs to protect the wiring all the way through to the trailer electric brakes.
Using a fuse in place of an auto reset circuit breaker on the black wire, at the battery, is a more reliable circuit protection, can decrease installation time and cost as there is no requirement to find a suitable mounting location or drill mounting holes.
THE RECOMMENDATION OF USING A 25 AMP FUSE IN PLACE OF A 30 AMP CIRCUIT BREAKER IS AN ACCEPTABLE ALTERNATIVE WITH THE REDARC TOW PRO ELITE ONLY.
THE DIFFERENCE IN AMP RATING OF THE RECOMMENDED 25-AMP FUSE OR 30-AMP CIRCUIT BREAKER IS DUE TO THE CIRCUIT BREAKER’S CURRENT RATING REDUCING AT HIGHER TEMPERATURES.