An over-temperature protection structure for a temperature controller, which consists of a heating rod and a temperature control box. The temperature control box is mainly connected with a temperature sensing wire and a power socket. The temperature sensing wire has an over-temperature protection temperature sensing device inside. Device, a water temperature control sensor device, the power socket is for the heating rod power plug to be plugged in to flexibly connect the heating rod； by connecting an external over-temperature protection temperature sensing device, it is used as a sensing device when the water temperature is too high , Independent of the water temperature control sensor device, to timely control the heating element, when the water temperature is higher than the over-temperature protection temperature value set by the heater, the heating element can immediately stop heating, avoiding the water temperature control sensor device Or when the water temperature control circuit fails, it can be used as the second protection mechanism； the over-temperature protection temperature sensing device can be configured to the appropriate position in the aquarium outside the heating rod, which can accurately sense the water temperature； over-temperature protection The temperature sensing device is covered and waterproof.一種控溫器之過溫保護構造，包含一加溫棒及一控溫盒所組成，主要係控溫盒外接一感溫線、一電源插座，該感溫線內部具有一過溫保護感溫裝置、一水溫控制感應裝置，該電源插座供加溫棒電源插頭插設，用以活動組接該加溫棒；藉由外接過溫保護感溫裝置，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；過溫保護感溫裝置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。
