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Tb02 Miniature Bimetal Thermal Switch 250V 2A for Portable Power Tools and Circuit Boards. The TB02 miniature bimetal thermal switch is designed for compact electrical assemblies where installation space is limited, including circuit boards, portable power tools, small motors, transformers. When the protected component reaches the selected operating temperature, the bimetal contact changes circuit status rapidly. After cooling to the reset range, the protector automatically return. 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.