Fuse selection
A common starting point is a fuse above the expected continuous current, often with a 1.25 margin, then rounded to the next available rating.
The fuse must still protect the smallest conductor in the circuit.
Automotive
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Automotive Fuse Calculator
Estimate a fuse rating from continuous load current and a safety margin.
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A fuse protects the wiring, not only the device. Choose wire and fuse together.
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Assumptions and limits.
- Educational estimate for a 12/24 V DC circuit. Follow the vehicle manufacturer fuse table and wiring protection requirements.
Frequently asked questions
Can I replace a fuse with a larger one?
Never. A larger fuse can overheat the wiring and cause a fire. Find the cause of the blown fuse.