Battery supplied fuse-current margins calculator

Calculate continuous-fuse margin and pulse-curve margin with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use continuous-fuse margin and pulse-curve margin to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Continuous battery current (A)
40
Pulse battery current (A)
100
Manufacturer continuous fuse allowance (A)
60
Manufacturer pulse allowance at selected duration (A)
120
Adjusted conductor limit (A)
70
Continuous-fuse margin (A)
20
Pulse-curve margin (A)
20
Conductor continuous margin (A)
30

Try another scenario

Continuous battery current (A)
41
Pulse battery current (A)
100
Manufacturer continuous fuse allowance (A)
60
Manufacturer pulse allowance at selected duration (A)
120
Adjusted conductor limit (A)
70
Continuous-fuse margin (A)
19
Pulse-curve margin (A)
20
Conductor continuous margin (A)
29
Calculation method

Calculation method

Continuous-fuse margin (A)

Compare entered continuous/pulse duties with already-selected manufacturer curve allowances and conductor limit; no protection design approval.

Pulse-curve margin (A)

Compare entered continuous/pulse duties with already-selected manufacturer curve allowances and conductor limit; no protection design approval.

Conductor continuous margin (A)

Compare entered continuous/pulse duties with already-selected manufacturer curve allowances and conductor limit; no protection design approval.

Symbols and units
a
Continuous battery current (A)
b
Pulse battery current (A)
c
Manufacturer continuous fuse allowance (A)
d
Manufacturer pulse allowance at selected duration (A)
e
Adjusted conductor limit (A)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • User-supplied measurements and assumptions; Compare entered continuous/pulse duties with already-selected manufacturer curve allowances and conductor limit; no protection design approval. Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
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