ITEM NAME:1Pack BT137-600E Triacs Thyristor TO-220 3-pin BT137-600E triacs thyristor, 3-pin design, TO-220 package. This BT137-600E triacs is widely used for frequency changing circuit, dimming / thermoregulation / speed regulation circuit and home appliance control circuit like electric fan, laundry machine, water dispenser, microwave oven, air.Pin Number: 3. Pin Length: Approx. Overall Size: Approx. 29 x 10 x 4 mm. Trigger Current (IGT): 30mA.