SX460 is a half-wave phase-controlled thyristor type\r\nAutomatic Voltage Regulator (AVR) and forms part of the\r\nexcitation system for a brush-less generator.', 'SX460 is a half-wave phase-controlled thyristor type Automatic Voltage Regulator (AVR) and forms part of the excitation system for a brush-less generator.In addition to regulating the generator voltage, the AVR circuitry includes under-speed and sensing loss protection features. Excitation power is derived directly from the generator terminals.Please read the specification sheet for further details