Fuse Rating for Normal Operation and Protection

Steps:

• Determine maximum operating current: 1.2A.
• Select fuse rating higher than maximum to prevent nuisance blowing during normal use.
• Choose smallest available rating above 1.2A for effective overload protection.
• 1.5A fits as the next standard size.

Why C is correct:

• Fuse rating must exceed peak operating current (per electrical safety standards) to allow normal function while melting at fault currents above 1.2A.

Why the others are wrong:

• A: 0.5A is below maximum, causing frequent blowing during normal operation.
• B: 1.2A matches maximum, risking intermittent failure without adequate fault protection.
• D: 13A is excessively high, failing to protect against moderate overloads.

Final answer: C