---
product_id: 640892936
title: "Mx321 Avr - Automatic Voltage Regulator - Exact Generic Replacement"
brand: "thunder parts"
price: "1958 kr"
currency: DKK
in_stock: true
reviews_count: 1
category: "Thunder Parts"
url: https://www.desertcart.dk/products/640892936-mx321-avr-automatic-voltage-regulator-exact-generic-replacement
store_origin: DK
region: Denmark
---

# Input voltage range 190-264V AC Output burden limit 10Ω with 0.5-1A sensitivity Storage temp -55°C to +800°C Mx321 Avr - Automatic Voltage Regulator - Exact Generic Replacement

**Brand:** thunder parts
**Price:** 1958 kr
**Availability:** ✅ In Stock

## Summary

> ⚡ Power up with precision — never let voltage drops slow you down!

## Quick Answers

- **What is this?** Mx321 Avr - Automatic Voltage Regulator - Exact Generic Replacement by thunder parts
- **How much does it cost?** 1958 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/640892936-mx321-avr-automatic-voltage-regulator-exact-generic-replacement)

## Best For

- thunder parts enthusiasts

## Why This Product

- Trusted thunder parts brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Robust Compatibility:** Seamlessly fits LV634, HC634 & P7 machines from 700kW to 2200kW
- • **High Durability Range:** Operates reliably in extreme temperatures from -55°C to 800°C
- • **Advanced PMG Isolation:** Minimizes interference and protects control circuits for cleaner power
- • **Effortless Replacement:** Generic exact fit ensures quick swap and minimal downtime
- • **Precision Voltage Stability:** Keeps your generator output rock-solid as loads fluctuate

## Overview

The MX321 AVR is a two-phase sensed automatic voltage regulator designed as a direct generic replacement for brushless generator excitation systems. It supports input voltages from 190 to 264V AC, limits output burden to 10 ohms with 0.5-1A sensitivity, and operates reliably across extreme temperatures (-55°C to 800°C). Compatible with LV634, HC634, and P7 generators ranging from 700kW to 2200kW, it uses a PMG system to isolate control circuits and reduce interference, ensuring stable generator voltage under varying loads.

## Description

GENERIC REPLACEMENT MX321 is a two phase sensed Automatic Voltage Regulator and forms part of the excitation system for a brush-less generator. Excitation power is derived from a three-phase permanent magnet generator (PMG), to isolate the AVR control circuits from the effects of nonlinear loads and to reduce radio frequency interference on the generator terminals. Sustained generator short circuit current is another feature of the PMG system.

Review: I had one fail after 30 days and tried to contact the seller on their website (they leave a little card in the box), filled out their form, etc and it immediately told me an error occurred. Tried again a few days later, same thing, so switched browsers and same thing. I would not really recommend buying from them.

## Features

- Sensing input: 190-264V ac max
- Limit output of 10 ohms burden with a 0.5 - 1A sensitivity range
- Storage temperature: -55 to +800 C
- Used on LV634, HC634 and P7 machines ranging from 700 kw to 2200 kw
- Used to stabilize the generator's voltage as the load changes"

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0759V8M55 |
| Best Sellers Rank | 3,416,286 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 748 in Travel Steam Generators |
| Customer Reviews | 3.6 3.6 out of 5 stars (10) |
| Date First Available | 17 Aug. 2016 |
| Item model number | MX321 |
| Manufacturer | Thunder Parts |
| Package Dimensions | 22.7 x 17.6 x 4.9 cm; 730 g |
| Part number | MX321 |

## Images

![Mx321 Avr - Automatic Voltage Regulator - Exact Generic Replacement - Image 1](https://m.media-amazon.com/images/I/618isO+qPKL.jpg)
![Mx321 Avr - Automatic Voltage Regulator - Exact Generic Replacement - Image 2](https://m.media-amazon.com/images/I/715JWM61xGL.jpg)
![Mx321 Avr - Automatic Voltage Regulator - Exact Generic Replacement - Image 3](https://m.media-amazon.com/images/I/61GGCBr3m+L.jpg)
![Mx321 Avr - Automatic Voltage Regulator - Exact Generic Replacement - Image 4](https://m.media-amazon.com/images/I/719TRqS2KWL.jpg)
![Mx321 Avr - Automatic Voltage Regulator - Exact Generic Replacement - Image 5](https://m.media-amazon.com/images/I/61Zx4dipVIL.jpg)

## Questions & Answers

**Q: Is that the complete part number?  i am looking for mx321 avr ...**
A: That is the complete part number.

**Q: Will this work as an upgrade for an older genorator?**
A: Not for upgrade. To use with a PMA. If your generator doesn’t have one don’t use this.

## Customer Reviews

### ⭐ Review
*by S***R on 9 April 2025*

I had one fail after 30 days and tried to contact the seller on their website (they leave a little card in the box), filled out their form, etc and it immediately told me an error occurred. Tried again a few days later, same thing, so switched browsers and same thing. I would not really recommend buying from them.

## Frequently Bought Together

- Thunder Parts | MX321 AVR | Generic Replacement for Cummins MX321 Automatic Voltage Regulator for Generator | 2 Year Warranty!
- R438 AVR - Automatic Voltage Regulator - Exact Generic Replacement | Voltage 95-480V AC | 2 Year Warranty
- CENTAURUS Compatible with AVR SE350 Automatic Voltage Regulator Control Module Replacement for Marathon Generator

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**Shop now:** [https://www.desertcart.dk/products/640892936-mx321-avr-automatic-voltage-regulator-exact-generic-replacement](https://www.desertcart.dk/products/640892936-mx321-avr-automatic-voltage-regulator-exact-generic-replacement)

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-03-13*