Fuses and Circuit breakers
Using a low quality breaker or fuse could mean catastrophic failure of your home or vehicle. Avoid a fire by using high quality devices recommended below! (affiliate links below)
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
DIHOOL Connection
Sizing Chart:
Now these are cool! Unmatched price and performance:
100/125/160/200/300/400A Models
Click Here to Purchase
- 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
100/125/160/200/300/400A Models
Click Here to Purchase
A Dependable Fuse
for 48V Systems
This is the original fuse that you can depend on. Do not trust the clones on amazon, they will burn down your house.
The megafuse rated for 70V is fantastic for lithium battery offgrid systems. If something is mission critical and you do not want to trust a breaker that has moving parts, this is a great choice.
The disconnect rating of these fuses is 2,500A. The MCCB breaker above is 25,000A. If you are planning to use a large lithium battery bank (anything larger than 100kWh), go with the MCCB breaker above instead.
For 99% of systems, this is a fantastic choice.
Click Here to Purchase 70VDC Megafuse
Click Here to Purchase Fuse Holder
The megafuse rated for 70V is fantastic for lithium battery offgrid systems. If something is mission critical and you do not want to trust a breaker that has moving parts, this is a great choice.
The disconnect rating of these fuses is 2,500A. The MCCB breaker above is 25,000A. If you are planning to use a large lithium battery bank (anything larger than 100kWh), go with the MCCB breaker above instead.
For 99% of systems, this is a fantastic choice.
Click Here to Purchase 70VDC Megafuse
Click Here to Purchase Fuse Holder
Large Lithium Battery Fuse: Class T
This is considered the best option but it is expensive and they cannot be reset thousands of times like the MCCB. But it does not have moving parts and has a smaller chance of failure (both have lows odds, but a fuse is always more reliable).
The best use case for these is connecting large bus bars in parallel. If you have two stacks of server rack batteries that you want to connect, use this.
Click here for a 200A T Class Fuse and Holder
Click here for a 300A T Class Fuse and Holder
The best use case for these is connecting large bus bars in parallel. If you have two stacks of server rack batteries that you want to connect, use this.
Click here for a 200A T Class Fuse and Holder
Click here for a 300A T Class Fuse and Holder
Terminal Fuse for Individual Batteries
These are convenient! If you are running piles of 12V batteries in parallel, or anything in a marine environment, these are incredible. Breaking capacity or AIC of 10,000A, and made by the best company around. Many cheap batteries do not have over current protection, and this fixes that issue.
Click Here To Purchase The Fuse
Click Here to Purchase The Terminal Fuse Holder
Click Here To Purchase The Fuse
Click Here to Purchase The Terminal Fuse Holder
Bolt On 12V Fuse: Very Versatile,
Avoid the Knock Offs!
Amazon is filled with fake AMG fuses and they are incredibly dangerous. Check out my test where I pulled 300A through a 150A knock off for 15 minutes! These things can cause a fire: Click Here
Downside: You can only use these with 12V systems! Do not attempt to use these on a 48V system, they are not rated for it!
But if you buy the real ones, they are fantastic! They are nice and thick and work great. Spend a few dollars more and get the right one:
Click Here To Purchase an Original BUSS AMG
Click Here to Purchase a Fuse Holder
Downside: You can only use these with 12V systems! Do not attempt to use these on a 48V system, they are not rated for it!
But if you buy the real ones, they are fantastic! They are nice and thick and work great. Spend a few dollars more and get the right one:
Click Here To Purchase an Original BUSS AMG
Click Here to Purchase a Fuse Holder
12V Fuse Block
Connect 12 volt appliances here with this fuse block. Easy to use and easy to install! These are great.
Click here to Purchase
Click Here to Purchase Fuses for the Fuse Block
Click here to Purchase
Click Here to Purchase Fuses for the Fuse Block
Inline fuses for small 12v DC appliances
Top Quality Inline fuse holder with copper wire.
Do not buy the cheap chinese ones, they will melt if you push more than 15 amps through them. You have been warned. Buy the high quality ones only!
Click Here
Do not buy the cheap chinese ones, they will melt if you push more than 15 amps through them. You have been warned. Buy the high quality ones only!
Click Here
