Transistor Type: Bidirectional Thyristor Triac Transistor. Product Model: The BT134-600 TO-126 transistor model provides reliable and efficient performance. Function: This Thyristor is capable of controlling high power due to its excellent gating parameters and low thermal resistance. Application: Ideal for various applications including power tools, electric heaters, and household appliances that need AC power control. Package: Comes in a pack of 10, enclosed in an Anti-Static bag for electrostatic protection, ESD safety, and longer shelf life.