An over-temperature protection structure for a heater, which is applied to a heater equipped with a temperature controller or called a separate heater. The structure includes a heating rod and a temperature control box. The temperature control box is external A temperature sensing wire, the temperature sensing wire is equipped with an over-temperature protection temperature sensing device, or there is no external temperature sensing wire and a new over-temperature protection temperature sensing device is added in the heating rod； by means of an external or new over-temperature protection temperature sensing device The device, as a sensing device when the water temperature is too high, is independent of the water temperature control sensor device, and controls the heating element in a timely manner. When the water temperature is higher than the over-temperature protection temperature set by the heater, it can immediately generate heat The element stops heating to avoid failure of the water temperature control sensing device or the water temperature control circuit failure, which can be used as a second protection mechanism； if an external temperature sensing wire is used, it can be configured to a suitable position in the aquarium outside the heating rod , It can accurately sense the water temperature； the over-temperature protection temperature sensing device is covered and has a waterproof effect.一種加溫器之過溫保護構造，係應用於設有控溫器之加溫器或者稱為分離式加溫器，構造包含一加溫棒及一控溫盒所組成，該控溫盒外接一感溫線，該感溫線內部設有一過溫保護感溫裝置，或者無外接感溫線而新增加過溫保護感溫裝置在加溫棒中；藉外接或新增過溫保護感溫裝置，作為水溫過高時之感知裝置，獨立於水溫控制感應裝置之外，以適時的控制發熱元件，當水溫高於加溫器設定的過溫保護溫度值時，可立即使發熱元件停止加熱，避免當水溫控制感應裝置或者水溫控制線路故障失效時，可做為第二道防護機制；若採用外接感溫線則可配置到加溫棒外部以外的水族箱內適當位置，能確實精準感測水溫；過溫保護感溫裝置被包覆而具防水之功效。
