# How To Determine Automotive Fuse Size

By | July 5, 2021

How To Determine Automotive Fuse Size. Gently slot the new fuse into the housing, taking care not to damage it Fill out our calculator at the top of the page and it will provide a recommended fuse size based on your inputs.

Select motor size from horsepower column making certain you are in the correct voltage. Use this calculator to select the appropriate fuse size for your load and wiring. For instance, if your amp has an internal 20 amp fuse, then you should go for a 25 or 30 amp inline fuse.

### Fill Out Our Calculator At The Top Of The Page And It Will Provide A Recommended Fuse Size Based On Your Inputs.

The fuses in the amplifier are (2) 30 amp fuses, for a total of 60 amps. Alternator or generator and regulator large terminals: Fuse size not to exceed 125% of transformer secondary rated amps.

### A Fuse Size And Shape Vary With A Change In Voltage.

Locate the fuse box or fuse panel. Lesrk, ecsr, jdl, lcl+.* b) secondary fuses (sum of following): It helps to suppress the arc.

### The Recommended Main Fuse Size Is Based Off The Sum Of All Amperages + 125% Overcurrent For The Largest Branch (Or 250% For The Largest Motor).

Use a calculator to divide the number of watts by the voltage. Use the following steps to understand how to easily change an automotive fuse: The voltage rating of a fuse must be equal to or greater than the circuit voltage.

### Read Horizontally To The Right Until The Distance Is As Great Or Greater Than Your Installation Distance.

Use this calculator to select the appropriate fuse size for your load and wiring. The fuse rating calculation or fuse sizing formula is the 1.25 times of the fla for motor, 2 times of the fla for transformer, 1.5 times of the lighting load To determine how big the wire needs to be, you have to figure the approximate length of the wire from the amp installation point to the battery (all amps must be wired directly to the battery).

### Size Fuses Not Over 125%.

Select fuse or breaker size from column 3 or 4. Go vertically to the head of that column for the recommended wire size. As exceptions exist, refer to the appropriate n.e.c.