SW-1,3,5 Series Thermal Cutoff contains a sliding contact, spring, and electrically nonconductive thermal pellet.
Under normal operating temperature, the solid thermal pellet holds spring-loaded contacts closed. So, current flows from left lead to the sliding contact and then through the metal case to right lead.
When a predetermined temperature is reached, the thermal pellet melts, allowing the compression spring to relax. That is, spring expend, moving the sliding contact away from the left lead. The circuit is opened, breaking contact between the left lead and sliding contact.
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SW-2 Series Thermal Cutoff come with axial lead wires. It's coated with a special compound to protect it form oxidation. The coated element is housed in a special insulated container and is hermetically sealed.
The special resin compound liquefies beginning when the ambient temperature rises,
as the temperature reaches the melting point of the thermal element, the resin compound generates a surface tension that causes it to form a bulb-like shape which pulls the liquefied element apart. The next, permanently breaks the electrical circuit.
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