Are there different selection precautions to be taken when using a eutectic vs. a pellet type TCO?
Yes. Pellet types are subject to shortened life expectancy resulting in nuisance opening when normal operation is too close to the rated opening temperature of the TCO. This end-of-life experience is also shortened by temporary heat overshoots that contribute to pellet shrinkage. We encourage at least a 20 degree C. buffer between normal ambient temperature and the rated opening temperature of the TCO. Similarly, thermal gradients across the TCO’s housing or due to leads being at different temperatures can contribute to sublimation reducing pellet size. For further depth on this factor of pellet aging we recommend reviewing U.L. Standard 1020. Eutectic thermal fuses have the advantage of simplicity of operation. There are no moving parts, springs or contacts. They use a two phase eutectic element that simply melts when it reaches the formulated temperature. Surface tension then separates the eutectic metal, opening the circuit. Eutectics come in a greater variety of sizes, axial and ra
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