SX440 is a half-wave phase-controlled thyristor type Automatic Voltage Regulator(AVR) and 
forms part of the excitation system for a brushless alternator, such as Stamford or stamford 
technical alternator. 
Technical specification 
Input 
        Voltage       190~260VAC 
        Frequency   50~60Hz 
Output 
        Voltage       Max 90VDC at 207VAC input 
        Current        Continuous 4ADC 
                           Intermittent 6A for 10 secs 
        Resistance   15 ohms minimum 

We mainly supply the following  AVR: 
General AVR Series Replacement:
GAVR-15A GAVR-12A GAVR-8A

Stamford Series AVR Replacement:
SX440 AS440 SX460 MX321 MX341

Leroy somer Series Replacement:
R448 R449 R230 R438

Marathon AVR Replacement:SE350    
we supply:fast delivery ,good service with high quantity and competitive price.high discounts on volume orders as well.