Which temperature range defines the maximum rating for fusible links?

Which temperature range defines the maximum rating for fusible links?

• A. 155-165 F
• B. 140-150 F
• C. 170-180 F
• D. 200-210 F

Answer: (A)

Fusible links act as heat-activated safety devices: they melt at a specific temperature to trigger a safety action, like opening a circuit or releasing a containment. The maximum rating is that melting temperature. Using a range around 155-165 F keeps the activation point at a predictable, protective level—high enough to avoid nuisance trips in normal conditions, but low enough to activate before heat causes damage. The other ranges would either melt too soon (lower rating) or too late (higher ratings), reducing the protective effectiveness.

Fusible links act as heat-activated safety devices: they melt at a specific temperature to trigger a safety action, like opening a circuit or releasing a containment. The maximum rating is that melting temperature. Using a range around 155-165 F keeps the activation point at a predictable, protective level—high enough to avoid nuisance trips in normal conditions, but low enough to activate before heat causes damage. The other ranges would either melt too soon (lower rating) or too late (higher ratings), reducing the protective effectiveness.