POPULACE
Generator Automatic Voltage Regulator Stamford AVR AS540
Model: AS540
OEM-compatible AS540 generator AVR at factory wholesale price. 100% bench-tested, 13-month warranty, in stock. Request wiring diagram, datasheet & quote.
| Warranty | 13 months |
|---|---|
| Place of Origin | Fujian, China |
| Brand Name | POPULACE |
| Model Number | AS540 |
| Overall Size | 175×15×65mm |
| Weight | 0.38kg |
| Certification | CE,ISO9001 |
Applications
- Standby and prime diesel generator sets fitted with Stamford alternators in telecom, data-centre and hospital backup power
- Commercial and industrial gensets requiring stable output voltage under varying load
- Alternator rewinds and rebuilds where the original AVR is obsolete or damaged
Product Description
Generator Automatic Voltage Regulator Stamford AVR AS540
General Features
 | Generator Automatic Voltage Regulator Stamford AVR AS540 AS540 AVR provides closed loop control by sensing the alternator output voltage at the main stator windings and adjusting theexciter 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. |
 | Features * 95 VAC to 130 VAC 1 phase or 190 VAC to 265 VAC 1 phase
*Max. 82 Vdc @ 200 Vac input *Continuous 4A, Transient 7.5A for 10 seconds |
| Product Name | Automatic Voltage Regulator Generator AVR AS540 | |
| Sensing/Power input | Voltage | 95 VAC to 130 VAC 1 phase or 190 VAC to 265 VAC 1 phase |
| Frequency | 50/60 Hz jumper selectable | |
| Output | Voltage | Max. 82 Vdc @ 200 Vac input |
| Current | Continuous 4A, Transient 7.5A for 10 seconds | |
| Voltage Regulation | < +/-1% (with 4% engine governing) |
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Stamford SX460 vs MX341 vs AS480: Which AVR Does Your Alternator Really Need? (2026 Engineering Guide)
Selecting between Stamford SX460, MX341, and AS480 AVRs depends on your alternator frame, excitation source (Shunt, PMG, or EBS), and load profile. Here is the full engineering breakdown.
Read Guide → Engineering GuideGenerator AVR Not Producing Voltage: 5 Causes and How to Test Them
A generator that runs but produces no power is most often an excitation or AVR problem. Here are the five causes we see most in the field, the multimeter check for each, and when the regulator itself needs replacing.
Read Guide →FAQ
Stamford AVR AS540 is an OEM-compatible replacement. Send a photo of your alternator nameplate (model, voltage, frequency) and our engineers confirm the match against AS540 before dispatch.
Yes. Output voltage, stability adjustment and protection functions are bench-tested on every unit, and the test record travels with your order.
Stamford AVR AS540: overall size 175×15×65mm, shipping weight approx. 0.38kg. Send your panel or packing constraints and we confirm fit.
Stamford AVR AS540 is covered by a 13 months factory warranty. Quality issues within the term are replaced or repaired at our cost.
Stamford AVR AS540 carries CE,ISO9001 certification from our ISO9001-certified Xiamen facility.
Yes. POPULACE Electronic Co., Ltd. manufactures generator parts in Xiamen, Fujian - factory visits are welcome.
Yes. Samples are available for testing; express freight (FedEx, DHL, UPS, TNT, Aramex) typically delivers within 3-7 days.
In-stock items ship 2-3 days after payment; larger batches are produced in 3-7 days. Sea, air or express shipping is arranged to your preference.
T/T, PayPal, Western Union, MoneyGram, Alibaba order link and RMB transfer are all supported.
Yes. Detailed terminal connection wiring diagrams and user manuals for AS540 are available upon request. Contact our technical support with your generator setup to receive the documentation.
The technical datasheet and complete specification sheet for AS540 can be provided directly by our sales team. Contact [email protected] or submit an inquiry to receive the PDF specification.
20 Years Experience for Genset Parts
POPULACE has 20 years of experience supplying generator parts worldwide — reliable, OEM-compatible, and built for continuous operation.
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