"automatic voltage regulator AVR230 voltage regulator of a sealed electronic devices, by adjusting the excitation" 
current in order to stabilize the output voltage of the brushless generator. 
Technical specification: 

Voltage regulation: around±0.5%. 
Voltage supply/sensing range 85 to 139V (50/60Hz) 
Rapid response time (500 ms) for a transient voltage variation amplitude of ±20% 

3.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   
"Fast delivery good service with high quantity and competitive price,offer high discounts on volume orders as well"