AVR R448 Automatic Voltage Regulator for Diesel Generator


Availability: 20 in stock

Substitute Leroy Somer Generator Voltage Regulator AVR R448
Now in stock for Original purchase

Sharing is caring!


The circuitry of the R448 Automatic Voltage Regulator (AVR) provides closed loop control of the alternator output voltage by regulating the exciter field current. The primary winding has a voltage in ratio to that of the alternator (characteristic shunt), the next has a voltage in proportion to the stator current (compound characteristic: booster effect). Which is powered by two auxiliary windings which are independent of the voltage equal circuit. The power supply voltage is rectified and filtered before being used by the AVR monitoring transistor. With PMG excitatioin, a permanent magnet generator (PMG) added to the alternator supplies the AVR with voltage which is free of the main alternator winding. This is built-in at the rear of the machine and connected to the R448 AVR, and the ST9 jumper must be disconnected.


Input voltage: 70-140V AC, (PMG, or auxiliary winding, single, three phases)
Reaction is measured: 90-480V AC
MAX. output:DC 10A 125V
Function: Built-in low-speed, over excitation

Generator AVR R448
Voltage regulation± 0.5%
Remote voltage adjustment range± 5%
Short circuit capability3 x Irated for 10 seconds
Voltage sensing95 to 140 volts (50/60 Hz)
170 to 260 volts (50/60 Hz)
340 to 520 volts (50/60 Hz)
Response timeNormal (1 sec) for ± 20% voltage variation
Rapid (0.3 sec) for ± 20% voltage variation

Find out more generator Automatic Voltage Regulator

Similar Products


There are no reviews yet.

Be the first to review “AVR R448 Automatic Voltage Regulator for Diesel Generator”
Review now to get coupon!

Your email address will not be published. Required fields are marked *

Scroll to Top