Can a Fuse Show Continuity but Still Be Bad? How to Properly Test It
Learn why a fuse can show continuity yet fail to handle rated current, and how to properly test fuses for accurate diagnosis.
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Yes, a fuse can appear to have continuity and still be bad. This occurs when a fuse is capable of allowing a small amount of current to pass through but is not able to handle its rated current flow. This condition, known as a high resistance connection, can happen due to internal damage that isn't visually obvious. Therefore, it's crucial not just to rely on continuity tests but also check the fuse against its rated current capacity with proper testing equipment.
FAQs & Answers
- Why does a fuse sometimes show continuity when it is actually bad? A fuse can show continuity because a small current still passes through it despite internal damage that prevents it from handling its rated current, creating a high resistance connection.
- How do I properly test if a fuse is working? Proper fuse testing involves checking both continuity and verifying it can handle its rated current with appropriate testing equipment, not just relying on simple continuity tests.
- What causes a high resistance connection inside a fuse? High resistance inside a fuse is usually caused by internal damage or partial melting, which isn’t visible externally but impairs the fuse’s ability to carry its rated current.