8 A standard triac in TO-220F — what it switches
The WeEn BTA208X-600B,127 is a standard single triac rated for 600 V off-state and 8 A RMS on-state continuous current. It comes in the TO-220-3 Full Pack (isolated tab) package, through-hole mount, with a maximum junction temperature of 125°C. The 50 mA gate trigger current and 1.5 V gate trigger voltage mean a small-signal transistor or optocoupler can drive it directly, though a series resistor is needed to limit gate current. The 60 mA holding current ensures the device latches on once triggered, so a minimum load current above that level is required to keep it conducting through the AC zero-cross.
Surge and load considerations
Non-repetitive surge current is rated at 65 A for 50 Hz and 71 A for 60 Hz (one cycle). That surge capability covers inrush from motor starts, capacitive loads, or incandescent lamp filaments.