How to Wire a DC Circuit Breaker?

It is important that the DC circuit breaker connection wiring is properly connected to the DC circuit. Here’s a step-by-step guide to wiring a DC circuit breaker.

Select a suitable location.

Choose a suitable location to install the DC circuit breaker in your electrical system. Consider factors such as accessibility, adequate ventilation, proximity to power sources and loads, install inside the DC combiner box , and others.

Power off:

Make sure that power to the circuit is off before you begin wiring. Depending on the system, you may need to turn off the power switch, remove the DC fuse, remove the battery, or even remove the DC PV combiner box.

Select an appropriate wire size.

Determine the correct wire size based on the amperage rating of the circuit breaker and the maximum current through the circuit. Refer to the appropriate electrical code or standard to ensure proper wire size.

Connect the terminals of the circuit breaker.

A DC circuit breaker typically has two terminals, often labeled “Line” or “L” for the input current and “Load” or “Ld” for the output terminal. Follow these steps to connect the wires:

A. Strip:

Strip a sufficient length of insulation from the end of the wire attached to the circuit breaker terminal. The stripped length should be long enough to make a good connection.

B. Insert the wire:

Insert the stripped ends of the wires into the appropriate circuit breaker terminal slots. Make sure the cable is securely fastened to the clamp.

C. Tighten the clamp:

Tighten the circuit breaker terminal screw using a screwdriver or suitable tool. Make sure the screws are tight to ensure a secure electrical connection.

Connect the other end of the wire.

Connect the other end of the wire to the appropriate terminal or component in your circuit. This may include loads, power supplies, or other devices.


If required by electrical codes or system design, connect the ground wire to the designated ground terminal or circuit breaker lug. Check your connection again.

After all connections are made, double check the wiring to make sure all terminals are properly tightened and all wires are securely connected.

Restore power:

After verifying that all connections are correct and secure, reapply power to the circuit. This may include reinserting the DC fuse, turning on the power switch, reconnecting the battery, or reinstalling the DC breaker box.

When wiring a DC circuit breaker, DC mcb, or install DC breaker PV combiner box, it is important to follow applicable electrical codes, guidelines, and safety precautions. If you are inexperienced with electrical work, we recommend that you hire a qualified electrician for assistance.


It is really convenience if you install DC circuit from single brand for easiness in installation, functionality, and reliability. You can chooses a brand that have various DC circuit product types from 1000V DC breaker, 100 amp DC breaker, DC mcb for solar, DC breaker for battery, DC fuse, DC spd, and DC combiner box.

What Are the Advantages of DC Circuit Breaker?
Installation of a Solar Combiner Box

Related Products