Is that the complete part number? i am looking for mx321 avr ...

That is the complete part number.

Will this work as an upgrade for an older genorator?

Not for upgrade. To use with a PMA. If your generator doesn’t have one don’t use this.

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⚡ Keep your power steady, no matter the load!

HEAVY DUTY LOAD SUPPORT - Optimized for high-capacity generators between 700 kW and 2200 kW, perfect for industrial-grade performance.
ROBUST THERMAL ENDURANCE - Engineered to withstand extreme storage temperatures from -55°C up to a scorching 800°C for unmatched durability.
PLUG AND PLAY REPLACEMENT - Exact generic replacement for MX321, compatible with LV634, HC634, and P7 machines—upgrade without hassle.
PRECISION VOLTAGE STABILITY - Automatically regulates voltage to keep your generator output rock-solid under varying loads.
WIDE INPUT VOLTAGE COMPATIBILITY - Handles a broad 190-264V AC range, ensuring seamless integration with diverse power sources.

The MX321 Automatic Voltage Regulator by Thunder Parts is a high-precision device designed to stabilize generator voltage across a wide input range (190-264V AC). Built for heavy-duty generators from 700 kW to 2200 kW, it endures extreme storage temperatures (-55°C to 800°C) and fits seamlessly as a direct replacement for MX321 models used in LV634, HC634, and P7 machines.

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