The T4003NH52TOH from Infineon Technologies is a Silicon Controlled Rectifier with Breakover Voltage 5200 V, Breakover Current 100000 A, Gate Trigger Voltage 1.8 V, Gate Trigger Current 3400 A, Temperature Operating Range -40 to 120 Degree C. Tags: Chassis Mount. More details for T4003NH52TOH can be seen below.