A Pellet type thermal cutoff is when ambient temperature of the thermal cutoff rises to its operating temperature, the pellet melts spring A expands moving the slide contact away from lead A, then the electrical circuit is permanently opened.

Alloy type thermal cutoff - when ambient temperature of the thermal cutoff rises to its operating temperature the fusible alloy melts and due to the surface tension and the coating of special resin compound liquified element condenses into bulb-like shape around the end of each lead.  Then the electrical circuit is permanently opened.

Pellet type thermal cutoff - when ambient temperature of the thermal cutoff rises to its operating temperature, the pellet melts spring A expands moving the slide contact away from lead A, then the electrical circuit is permanently opened. Calco Electric offers the best and highest quality thermal cutoffs available.

1-5 Amps Alloy Type 16 Amps Organic (Pellet) Thermal Cutoff PDF

Looking for another type of cutoff?

• Direct Surface Sensing Thermal Cutoff Switch - DM Series
• CT Series Direct Surface Sensing Thermal Cutoff w/Current Fuse Incorperated
• Thermal Switch: 17AME-H Series