Calculate time fuse length, circuit fuse size, or inverter battery fuse from burn time, current, power, voltage, and load factors.

Test Fuse Calculator

Enter either the load current, or enter power and voltage to estimate the circuit current. The calculator applies the selected safety factor and finds the next common fuse size.

Results

Calculated Load Current
Minimum Fuse Rating
Recommended Fuse Size
Safety Factor Used

Time Fuse Length Formula

The following formula is used to calculate the Time Fuse Length. 

DL = TL / TT * DT

Variables:

  • DL is the desired Time Fuse Length (in)
  • TL is the test length (inches) 
  • TT is the test time (seconds) 
  • DT is the desired time (seconds) 

to calculate time fuse length, divide the test length by the test time, then multiply by the desired time.

How to Calculate Time Fuse Length?

The following steps outline how to calculate the Time Fuse Length.

  1. First, determine the test length (inches).
  2. Next, determine the test time (seconds). 
  3. Next, determine the desired time (seconds). 
  4. Next, gather the formula from above = DL = TL / TT * DT.
  5. Finally, calculate the Time Fuse Length.
  6. After inserting the variables and calculating the result, check your answer with the calculator above. 

Example Problem:

Use the following variables as an example problem to test your knowledge.

test length (inches) = 36

test time (seconds) = 180

desired time (second) = 270

DL = TL / TT * DT =  ?