300 AMP DC CLASS T FUSE

This 300 amp class T fuse (JLLN made by Littelfuse) is DC (direct current) rated for 300 amps at up to 125 volts. It is the fuse most used to protect inverter / battery cables and recommended by every inverter manufacturer and required by every electrical code that we know of.

It is also rated for up 300 volts if used in an AC (alternating current) application.

class t dc fuse certifications 200 amp

These 300 amp DC JLLN class T fuses have the following certifications:

These class T fuses are usually used for the solar industry to protect battery / inverter cables but are also popular for high current applications such as an electric car, or anything with a large battery bank and large battery cables.

If you are using a 250 amp DC circuit breaker for your inverter, then the 300 amp class T fuse is the preferred choice in case of accidental contact of the inverter terminals or short circuiting of the inverter cables.

It is best to install your fuse (and holder) as close to your battery bank as possible.

For those of you interested, the 1-70 amp Littelfuse JLLN class T fuses are rated for up to 160vdc (volts DC) and the 70-1200 amp models are rated for up to 125vdc (volts DC). All of the JLLN class T fuses made by Littelfuse are rated for up to 300vac (volts AC) no matter what the amperage rating.

These class T 300 amp fuses have an arc interrupt rating current (A.I.R.C.) of 20,000 amps DC (direct current) and 200,000 amps AC (alternating current).

I'll explain what this means...

When a fuse blows there is a brief arc (extremely hot fire) that is supposed to stay inside the fuse. If allowed to come outside of the fuse, it could cause a fire and burn you and/or your home/cottage/RV down.

The A.I.R.C. rating DC of 20,000 amps means you could force up to 20,000 amps (massive amount of current) through the fuse and it will extinguish the arc and not cause a fire.

You can see these ratings in the photo below:

  • The DC A.I.R.C. rating is located just below the 125V DC rating. It shows 20KA I.R. (or 20,000 amps interrupt rating).
  • The AC A.I.R.C. rating is located just below and to the right of the CSA stamp. It shows 200KA I.R. CURRENT LOADING (or 200,000 amps interrupt rating).

Notice the close up of the 200 amp class t fuse. It is rated for 125 vdc (volts DC) and you can see the CSA (Canadian Standards Association) for those of you who live in Canada.

Notice the close up of the 300 amp class t fuse. It is rated for 125 vdc (volts DC) and you can see the CSA (Canadian Standards Association) for those of you who live in Canada.

The high current DC rating on the 300 amp class t fuse makes them invaluable to those wanting to protect their solar electric / inverter system from catastrophic damage should there ever be a short circuit. It might seem unlikely that your inverter cables could short out but all it takes is a little carelessness or a dropped wrench or screwdriver.

Here is another close up of the 200 amp class t fuse. It is rated for 300 vac (volts AC) and you can see the UL (Underwriter's Laboratory listing).

Here is another close up of the 200 amp class t fuse which looks identical to the 300 amp. It is rated for 300 vac (volts AC) and you can see the UL (Underwriter's Laboratory) listing.

 

In the solar industry, they are mainly used in a fuse block and purchased as a spare after purchasing a 300 amp class T DC fuse with fuse block such as those made by Deltec Co. in Norwalk, CA.

This is the best class T fuse holder in the industry. It is made by Deltec Co. of Norwalk, California.

This is the best class T fuse holder in the industry. It is made by Deltec Co. of Norwalk, California.

We have seen many do-it-yourselfer installations where the inverter cables are simply bolted to the fuse on either end. Although the fuse will provide over current protection, it will violate any electrical code and provide an unprotected connection that is live. When the fuse is installed in one of the fuse blocks (such as the Deltec Co. fuseblocks), the fuse is encased in polycarbonate (Lexan) and will be impossible to touch without removing the cover.

If you already have a fuse block, you can see if this fuse will fit by using the dimensional drawing below.

Here are all the dimensions for the 200 amp class T fuse in millimeters (mm).

Here are all the dimensions for the 300 amp class T fuse in millimeters (mm).

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Price: $33.00

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