Stamford SX440

Very famous and versatile product

SX440 is a half-wave phase-controlled thyristor type Automatic Voltage Regulator (AVR) and forms part of the excitation system for a brush-less generator.

Original product to meet machine specs

In addition to being powered from the main stator, the AVR also derives a sample voltage from the output windings for voltage control purposes. In response to this sample voltage, the AVR controls the power fed to the exciter field, and hence the main field, to maintain the machine output voltage within the specified limits, compensating for load, speed, temperature and power factor of the generator..

Technical specification

INPUT Voltage 190-264V ac
Frequency 50-60 Hz nominal
Phase 1
Wire 2
OUTPUT
Voltage max 90V dc at 207V ac input
Current continuous 4A dc
Intermittent 6A for 10 secs
Resistance 15 ohms minimum
REGULATION +/- 1% (see note 1)