A fuse is the most common type of protection...

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Question 1 of 2066636eed28f7522a1c51d649

A fuse is the most common type of protection against a short-circuit fault in LV distribution circuits, motor circuits and for portable appliances. What is a major drawback or deficiency with the use of fuse?

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Question 1 of 20

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🔍 Key Concepts

• Purpose of a fuse in low-voltage (LV) circuits – what it is specifically designed to protect against • Difference between short-circuit protection and overload (small overcurrent) protection • How fuse operation time changes with magnitude of fault current (time–current characteristics)

💭 Think About

• Think about what a fuse does extremely well in the presence of a large, sudden fault current, and what it does not do as well when currents are only slightly above normal. • Compare which of the options contradict the basic function of a fuse (those can be ruled out quickly). • Consider whether a fuse’s main limitation is about heat generation, speed at high short-circuit current, or its response to small overcurrents.

✅ Before You Answer

• Eliminate any choice that says a fuse does not protect against short circuit – that is actually its primary job. • Recall that for very high fault currents, fuses usually operate very fast, not very slow – check any option that claims the opposite. • Ask: Is a standard fuse typically good or poor at detecting and opening on slight overloads / small overcurrents over time? That points you toward the key deficiency.

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