Cantherm is a thermal sensors and protection supplier with a good offering of inexpensive thermal fuses for your projects. Their SDF series of thermal fuses are one such option. We’ve had some concerns about scuffs, scratches, and other visual blemishes for these devices recently; do such blemishes count as defective product?
Unless the underlying ceramic is visible through any surface damage, scuffs or minor scratches in its surface plating are not considered defective for this product.