They can be used as an ON/OFF function in applications such as static relays, heating regulation, induction motor starting circuits... or for phase control operation in light dimmers, motor speed controllers. Thanks to their clip assembly technique, they a superior performance in surge current handling capabilities. By using an internal ceramic pad, the series provides voltage insulated tab (rated at 2500VRMS). Product Name : Triacs Model : BTA41-600B Voltage : 600V on-state Current : 40A Mounting Hole Diameter : 4mm/ 0.16 Pin Size : 16 x 5.04mm/ 0.63 x 0.2 ( L* Pitch) Body Dimension : 36 x 15 x 4mm/ 1.4 x 0.6 x 0.16 (L*W*T) Material: plastic, metal Package Content : 1 x Triacs Note:Light and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/-1-3 cm.