POPULACE
Generator Automatic Voltage Regulator Stamford AVR MX321
Model: Stamford AVR MX321
Compatible Stamford AVR MX321 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 | Stamford AVR MX321 |
| Overall Size | 230×170×55mm |
| Weight | 0.63kg |
| 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- Alternator rewinds and rebuilds where the original AVR is obsolete or damaged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 MX321
General Features
 | Generator Automatic Voltage Regulator Stamford AVR MX321 The MX321 is an analogue, 2-phase sensing, self-excited automatic voltage regulator (AVR). The AVR is linked with the main stator windings and the exciter field windings to provide closed loop control of the output voltage. The MX321 is most commonly used on UC range and are supplied as standard to the UC22 and UC27 alternators. |
 | Features *190 to 264 Vac,1 phase 2 wire jumper selectable *50/60 Hz jumper selectable *Max. 90 Vdc @ 207 Vac input *Continuous 4A,Intermittent 6A for 10 seconds *< +/-1% (with 4% engine governing) |
| Product Name | Generator AVR MX321 (Use wima or simens capacitor IC) | |
| Sensing/Power input | Voltage | 190 to 264 Vac,1 phase 2 wire jumper selectable |
| Frequency | 50/60 Hz jumper selectable | |
| Output | Voltage | Max. 90 Vdc @ 207 Vac input |
| Current | Continuous 4A,Intermittent 6A for 10 seconds | |
| Voltage Regulation | < +/-1% (with 4% engine governing) |
Wiring Diagram
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Technical Guides & Troubleshooting
Engineering diagnostics, terminal wiring diagrams, and parts replacement procedures.
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 MX321 is an Compatible replacement. Send a photo of your alternator nameplate (model, voltage, frequency) and our engineers confirm the match against MX321 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 MX321: overall size 230×170×55mm, shipping weight approx. 0.63kg. Send your panel or packing constraints and we confirm fit.
Stamford AVR MX321 is covered by a 13 months factory warranty. Quality issues within the term are replaced or repaired at our cost.
Stamford AVR MX321 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 Stamford AVR MX321 are available upon request. Contact our technical support with your generator setup to receive the documentation.
The technical datasheet and complete specification sheet for Stamford AVR MX321 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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