AVR AS540 Automatic Voltage Regulator for Stamford Diesel Generator

(3 customer reviews)


Availability: 15 in stock

Original Option
**Genuine Alternative:** This AVR AS540 is a high-quality aftermarket replacement for the original Stamford voltage regulator.

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The AVR AS540 is used in Stamford generators. The AS540 offers an optional feature for paralleling with multiple generators.

The AS540 AVR is an analogue, 2-phase sensing, self-excited automatic voltage regulator (AVR) incorporating an interface for the optional auxiliary winding for improved motor starting performance and sustained short circuit current.

The Generator AVR AS540 AVK provides closed loop control by sensing the alternator output voltage at the main stator windings and adjusting the exciter the stator field strength. Voltage included in the exciter rotor rectified by the rotating diodes, magnetises the rotating main field which includes voltage in the mani stator windings. A seff-excited AVR receives power from the alternator output terminals or a special auxiliary winding in the main stator winding.


ModelGenerator AVR AS540
Sensing Input:
Voltage95 VAC to 130 VAC 1 phase or 190 VAC to 265 VAC 1 phase
Frequency50 Hz to 60 Hz nominal
Power Input:
Voltage95 VAC to 265 VAC 1 phase only
Frequency50 Hz to 60 Hz nominal
Power Output:
VoltageMaximum 82 VDC at 200 VAC input
CurrentContinuous 4A, Transient 7.5A for 10 seconds

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3 reviews for AVR AS540 Automatic Voltage Regulator for Stamford Diesel Generator

    William Koch
    January 4, 2024
    Got AS540 AVR for 1/4 the cost of OEM. Was delivered in less than a week, well packaged. Installed and working perfectly. Had minor question regarding configuration and they responded promptly despite being a long holiday. Highly recommend, indeed I will be ordering again from them.
    March 17, 2023
    It works like a glove! Thank goodness. Thanks for the extra gasket, I really appreciate doing business with you! ! ! Thank you for being patient with me
    November 2, 2022
    Hands down one of the best sellers . On this site there are many great people, this group go above and beyond in all areas. Outstanding communications, fast shipping and great products. Thank you!
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