AS440 is a half wave phase controlled thyristor type AVR
and forms part of the excitation system for a brushless
generator. The design employs Surface Mount Technology
(SMT) for high integration of features in a small footprint AVR.
MX321 is a three phase sensed Automatic Voltage Regulator and forms part of the excitation system for a
brush-less generator. Excitation power is derived from a three-phase permanent magnet generator (PMG), to
isolate the AVR control circuits from the effects of nonlinear
loads and to reduce radio frequency interference on
the generator terminals. Sustained generator short circuit
current is another feature of the PMG system.