Circuit protection is critical in DC applications as well as AC applications. High current draw can damage wiring, components and internal circuits. The design of a circuit breaker is to protect these components by stopping the flow of current through the circuit. A circuit breaker trips when excessive current heats up the internal component, causing the breaker to “trip”. The “tripped” circuit breaker then stops the flow of current in the circuit. There are two styles of DC circuit breakers, resettable and automatically resetting. A resettable circuit breaker requires the external switch to be moved back into the “On” position. Automatically resetting circuit breakers will automatically reset after the internal devices cool down. Though these two circuit breakers operate differently, their wiring connections are basically the same.
Things You'll Need
- Wire cutter
- Wire stripper
- Wire crimpers
- Ring terminals
Disconnect the battery. Use a wrench to disconnect the negative terminal on the battery. Place the negative battery cable in a position that it will not contact a battery terminal. Disconnect the positive battery terminal.
Select the location to mount the DC circuit breaker. Install the circuit breaker in the required location.
Run a wire from the fuse box or positive battery bus bar to the circuit breaker location. Always use the proper wire size for the current and distance in your application.
Strip ½ inch of insulation on the end closest to the bus bar or fuse box. Use the wire crimpers to fasten one ring terminal to the wire end. Fasten the wire and ring terminal to the bus bar or fuse box.
Strip ½ inch of installation from the other wire end. Use the wire crimpers to fasten a ring terminal to the wire. Loosen and remove the nut on the circuit breaker positive terminal post. Secure the ring terminal to the post.
Run a wire from the circuit breaker to the device or DC circuit that requires circuit protection. Strip ½ inch of installation from the end next to the circuit breaker. Fasten a ring terminal to the wire. Loosen and remove the nut on the circuit breaker negative terminal post. Secure the ring terminal to the post. Connect the other end of the wire to the device or DC circuit.
Reconnect the battery. Connect the positive battery terminal. Connect the negative battery terminal.
How to Wire a Circuit Breaker for My RV Battery
DC circuit breakers are available in a wide variety of sizes, styles and capacities, for marine and automotive purposes. Midrange circuit breakers...
12-volt DC Wiring Standards
12-volt DC Wiring Standards. Wiring a 12-volt DC circuit requires a working knowledge of electronics and circuitry. It is important to note...
How to Change a Car Circuit Breaker
Many of the circuits in today's car and trucks are protected by a circuit breaker. The circuit breaker comes in three different...
How to Wire a DC Power Jack
Contrary to what a well-known television commercial would have you believe, no batteries, not even the rechargeable variety, last forever. With the...
How to Wire a GFCI Circuit Breaker
The Ground Fault Circuit Interrupter (GFCI) saves lives. There are two different kinds for home use--electrical outlets and circuit breakers. GFCI circuit...
How to Wire a Disconnect Switch
Disconnect switches are useful to have in case of flooding or fire, when it would become dangerous for your home to have...