Major Brands T106D1 Diode, Sensitive Gate Silicon Controlled Rectifier, 400 Volt, 4 Amp, TO-220, 4.7 mm W x 7.87 mm H x 9.78 mm L (Pack of 10): Electronic Components: Amazon.com: Industrial & Scientific
T106D1 Littelfuse | Mouser
S4004V 4A 400V SCR - Datasheet
T106D1 Datasheet(PDF) - Littelfuse
How do SCR works and basic circuits | ElecCircuit.com
T106D1 datasheet - Specifications: SCR Type: Sensitive Gate ; Voltage
T106D1 datasheet(1/12 Pages) LITTELFUSE | Sensitive SCRs (0.8 A to 10 A)
5PCS T106D1 4A 400V SCR TO-202 _ - AliExpress Mobile