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The K10B series thermal cutoff (thermal fuse) is a temperature-sensitive safety component designed to protect electrical circuits from overheating. When ambient temperatures exceed a preset threshold, the K10B permanently opens the circuit, preventing fires and equipment damage. This article explores the key features, specifications, and applications of this essential safety device.
The K10B thermal cutoff is defined by several critical temperature parameters that determine its tripping behavior. According to OptiFuse specifications, the Rated Functioning Temperature (Tf) is the temperature at which the device opens the circuit, with a tolerance of +0/-10°C . The Cut-Off Temperature represents the actual operating range when the fuse is heated in a controlled oven at 0.5°C per minute .
Equally important are the Holding Temperature (Th) and Maximum Temperature Limit (Tm). The Holding Temperature is the maximum temperature at which the K10B can carry rated current for 168 hours without tripping . The Maximum Temperature Limit is the highest temperature the device can withstand for 10 minutes after functioning without losing its mechanical and electrical integrity .
The K10B series offers a wide range of temperature options, from K10B-066 (66°C rated functioning temperature) to K10B-240 (240°C) . Popular variants like K10B-167 are rated at 167°C with a holding temperature of 146°C , while K10B-228 has a holding temperature of 190°C and a maximum temperature limit of 300°C . This variety allows engineers to select the appropriate thermal cutoff for different application requirements.
