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In a DC (direct current) circuit breaker, the terms "plus" and "minus" typically refer to the positive and negative terminals or connections. These terms are commonly used in DC circuits to indicate the polarity of the voltage. When dealing with a DC circuit breaker, you should understand the function of these terminals and how to wire them correctly.

**Positive Terminal (+):** This terminal is usually connected to the positive side of the DC power source. It is the point in the circuit where the higher voltage potential is applied. For example, in a 12-volt DC circuit, the positive terminal is typically connected to the 12-volt supply.

**Negative Terminal (-):** This terminal is connected to the negative side of the DC power source and is at a lower voltage potential than the positive terminal. In a 12-volt DC circuit, this terminal is usually at 0 volts or ground.

Here are some general guidelines for wiring a DC circuit breaker:

1. **Disconnect Power:** Before working on any electrical component, always disconnect the power source to ensure your safety. For DC circuits, this means turning off the power supply or disconnecting the battery.

2. **Identify the Plus and Minus Terminals:** Identify the positive and negative terminals on your DC circuit breaker. This information should be provided in the manufacturer's documentation or marked on the device itself.

3. **Connect the Positive (+) Wire:** Connect the wire from the positive side of your DC power source (e.g., the positive terminal of a battery or power supply) to the positive terminal of the circuit breaker.

4. **Connect the Load:** Wire the load (the device or equipment that you want to control or protect with the circuit breaker) to the other terminal of the circuit breaker. In most cases, this will be the negative (-) terminal of the circuit breaker.

5. **Secure Connections:** Ensure that all wire connections are secure and properly insulated to prevent short circuits or electrical hazards.

6. **Reconnect Power:** Once all connections are made, you can safely reconnect the power source.

7. **Testing:** It's a good practice to test the circuit breaker to ensure it functions as expected. You can do this by simulating a fault or overload and verifying that the circuit breaker trips to disconnect the power.

Remember that the specific wiring and connection details may vary depending on the type and model of the DC circuit breaker you are using. Always consult the manufacturer's documentation and follow safety guidelines when working with electrical components. If you are unsure about any aspect of wiring a DC circuit breaker, it's a good idea to seek assistance from a qualified electrician or technician.