Fuses, Breakers & Power Distribution

Protecting your electrical system starts with choosing the right fuse, circuit breaker, and distribution hardware. From high-current battery banks and inverters to smaller 12V appliances, these components help manage power safely and protect your wiring from overloads and faults. Below are the products I recommend for building a reliable off-grid or vehicle electrical system.

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How to size a Breaker or Fuse

Take the continuous wattage rating on a device and divide it by the voltage it operates at (12/24/48V)

Let’s imagine that you have a 1500W 12V inverter. Take the wattage rating and divide it by the voltage to find the maximum current:

1500(W)/ 12(V) = 125 (Amps)

Next, take the maximum current (125Amps in this situation) and multiple it by 1.25:

125 (Amps) X 1.25 = 156.25 (Fuse Size)

You need a fuse that can trip at 156.25A. But they only make 150A and 200A fuses. So what you will need to do is round up to 175 or 200A fuse or breaker.

Be sure to use a wire that can handle 200A, so if a fault or overload were to occur, the cables can carry 200A to the fuse to trip it.

Best All Around: MCCB DC Breaker

Now these are cool! Unmatched price and performance:

Current Breaking Capacity similar or higher than a T-class fuse! Even if your lithium battery bank can create 25,000A, this thing can still disconnect safely.
Insulation Voltage Rating of 1000-1500VDC! Just crazy. Most models have a working voltage range of 250-500V. Considering the price, it is unbelievable.
Current Rating from 100-800A.
Massive terminal with large copper bar.
It can handle surges for induction loads without issue.
Arc Barrier Built-in
Test Button Built-in

You can use this to connect batteries together, inverters to a bus bar or even a solar charge controller to a system. Just ensure that the cables you connect to it are large enough to trip it. Use whatever the manual recommends.

DIHOOL Connection Sizing Chart:

100A

35 MM² / 2 AWG

125A

50 MM² / 0 AWG

160A

70 MM² / 00 AWG

200A / 225A

95 MM² / 000 AWG

250A

120 MM² / 0000 AWG

300A / 350A

185 MM² / 2×000 AWG

400A

240 MM² / 2×0000 AWG

500A

2×150 MM² / 3×000 AWG

600A

2×185 MM² / 4×000 AWG

MCCB DC Breaker

High-performance DC circuit breaker designed to protect high-current battery and power systems. With a high breaking capacity, wide voltage range, and built-in test button, it’s a reliable option for connecting battery banks, inverters, bus bars, and other critical components.

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Protect Your System With the Right Fuse

Reliable circuit protection is essential for keeping your batteries, cables, inverters, and other DC components safe. Explore recommended fuses and fuse holders for everything from small 12V systems to high-current 48V battery banks.

70VDC Mega Fuse

A reliable high-current fuse designed to protect your 48V battery system from overloads and faults. With a 70VDC rating and strong breaking capacity, it’s a simple and dependable choice for most lithium battery setups.

Mega Fuse Holder

A heavy-duty holder designed to securely mount your Mega Fuse and keep your high-current connections protected. A clean, reliable solution for battery banks, inverters, and other DC power systems.

Class T Battery Fuse

A premium high-current fuse designed for serious battery systems. With no moving parts and exceptional reliability, it’s an ideal choice for protecting large battery banks, inverters, and high-power DC connections.

Terminal Fuse for Individual Batteries

Protect each battery with a compact, easy-to-install terminal fuse. Ideal for parallel battery banks and marine systems, these fuses provide reliable overcurrent protection right where it’s needed.

Buss AMG Fuse for 12V Systems

A versatile high-current fuse designed for 12V battery systems, inverters, and other DC applications. Choose genuine Buss fuses for reliable protection and avoid low-quality knockoffs that may fail under heavy loads.

12V Fuse Block

Connect 12 volt appliances here with this fuse block. Easy to use and easy to install! These are great.

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Inline Fuse Holder

Protect individual 12V circuits with a durable inline fuse holder and copper wire. A simple, reliable solution for adding overcurrent protection where you need it.

Assorted Blade Fuses

Keep a range of standard automotive fuses on hand for quick replacements and new 12V installations. Multiple amperage ratings make it easy to protect different circuits.

Bus Bars

Bus bars simplify power distribution, reduce wiring clutter, and make it easier to build reliable 12V and 48V electrical systems.

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Fuses, Breakers & Power Distribution

How to size a Breaker or Fuse