If a fuse blows, what should you replace it with?

If a fuse blows, what should you replace it with?

• A. A fuse with a higher amperage rating
• B. A fuse of the same amperage rating
• C. A wire of adequate gauge
• D. A circuit breaker

Answer: (B)

Fuses are there to protect the wiring by opening the circuit if current gets too high. Replacing a blown fuse with a higher amperage rating removes that protection, allowing the wires to overheat and potentially burn. The right move is to use a fuse with the same amperage rating as the original, so the circuit is protected as designed. If the fuse keeps blowing, that signals a fault in the circuit that needs diagnosing and repairing before simply swapping in a higher-rated fuse. A wire of adequate gauge isn’t a substitute for protection by a fuse—the fuse is what stops the current before the wire overheats. A circuit breaker isn’t a direct replacement for a blown automotive fuse in most cases, since wiring and components are designed for a specific protective device.

Fuses are there to protect the wiring by opening the circuit if current gets too high. Replacing a blown fuse with a higher amperage rating removes that protection, allowing the wires to overheat and potentially burn. The right move is to use a fuse with the same amperage rating as the original, so the circuit is protected as designed. If the fuse keeps blowing, that signals a fault in the circuit that needs diagnosing and repairing before simply swapping in a higher-rated fuse. A wire of adequate gauge isn’t a substitute for protection by a fuse—the fuse is what stops the current before the wire overheats. A circuit breaker isn’t a direct replacement for a blown automotive fuse in most cases, since wiring and components are designed for a specific protective device.