8121M0500104KX is a part manufactured by Stantel. It is a miniature thermal switch designed for panel mounting. It has a rating of 5A at 125VAC and 2.5A at 250VAC. It has a temperature range of 25°F to 185°F and is UL Recognized, CSA Certified and MIL Spec approved. It features an adjustable threshold temperature range, UL recognized epoxy encapsulation and a rated cycle life of 5,000 operations.