After activation, which heat detector must be replaced?

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Multiple Choice

After activation, which heat detector must be replaced?

Explanation:
When a heat detector activates, not all types are one-and-done, but the fixed-temperature type is. This detector uses a sensing element that is permanently altered when it reaches its preset temperature—typically a fusible link or similar mechanism that is consumed during tripping. Because that element is spent, the device cannot be reset to its normal state and must be replaced to restore protection. Other heat detectors, such as rate-of-rise or line/spot types, are designed to be reset or serviced so the system can be re-armed without replacing the whole unit.

When a heat detector activates, not all types are one-and-done, but the fixed-temperature type is. This detector uses a sensing element that is permanently altered when it reaches its preset temperature—typically a fusible link or similar mechanism that is consumed during tripping. Because that element is spent, the device cannot be reset to its normal state and must be replaced to restore protection. Other heat detectors, such as rate-of-rise or line/spot types, are designed to be reset or serviced so the system can be re-armed without replacing the whole unit.

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