36. Thermal Fuse Ratings & Selection

Question.1

A thermal fuse datasheet shows:
• Tf = 128°C (functioning temperature)
• Th = 113°C (holding temperature)
An engineer mounts this thermal fuse on a transformer that reaches 118°C during full-load operation.
What is the most likely outcome?

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It will operate normally because 118°C is still below Tf = 128°C
It may open during normal operation because the transformer exceeds Th = 113°C
It will open only if current exceeds the fuse current rating
It will reset after cooling because 118°C is below Tf