SS321 AVR McPherson Controls Automatic Voltage Regulator

Product Summary
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The SS321 AVR is a PMG excited automatic voltage regulator. AVR sensing input is 190 – 264 VAC and produces 3.7 amp continuous and 6A max for 10 seconds, 50/60HZ. This regulator also has a Quadrature Droop CT Input, External Voltage Adjustment input, Over Voltage Detector Input, Under Frequency Protection, Current Limit Input and a 4 second Soft Start Ramp Time feature. This is a great aftermarket alternative to the original Cummins Stamford MX321-2 & MX321 AVR.


  • Newage MX321
  • Cummins Stamford MX321-2
  • Onan 305-0823

*All manufacturer names, numbers, symbols and descriptions are used for reference purpose only and do not imply that any part is the product of these manufacturer.

Additional information

Weight 4 lbs
Dimensions 12 × 7 × 4 in