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Tb02-B8d 250V 2A Auto-Reset Bimetal Temperature Switch and Thermal Protector. Ultra-Compact Housing for Dense Assemblies: The TB02 miniature bimetal structure helps save installation space in compact transformers, lighting ballasts, circuit boards, battery-related assemblies. When the selected temperature is reached, the snap-action contact changes circuit status. After cooling to the reset range, it returns automatically to support repeatable overheat protection. Flexible Contact and Lead Options: Available with Normally Closed or Normally Open contacts, metal or plastic housing choices, and selectable lead-wire configurations for different compact electrical.