AVR MX321 Automatic Voltage Regulator for Stamford Diesel Generator

(1 customer review)


Availability: 19 in stock

Original Option
**Genuine Alternative:** This AVR MX321 is a high-quality aftermarket replacement for the original Stamford voltage regulator.

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General description

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


Sensing InputVoltage190-264V ac max, 2 or 3 phase
Frequency50-60 Hz nominal
Power Input(PMGVoltage170-220V ac max, 3 phase, 3 wire
Frequency100-120 Hz nominal
OutputVoltageMax 120V dc
CurrentContinuous 3.7 A,

Intermittent 6A for 10 secs

Resistance15 ohms minimum
Regulation+/- 0.5% RMS with 4% engine governing
Thermal Drift0.02% per Deg. C change in AVR ambient
Soft Staret Ramp Time0.4 – 4 seconds
Typical system responseAVR response20ms
Filed current to 90%80 ms
Machine Volts to 97%300ms
External voltage adjustment+/-10% with 5k ohm 1 watt trimmer
Under frequency protectionSet point95% Hz
Slope100%-300% down to 30 Hz
Max. Dwell20% volts/S recovery
Unit power dissipation18 watts maximum
Analogue InputMaximum input+/- 5 Vdc
Sensitivity1v for 5% Generator Volts (adjustable)
Input resistance1k ohm
Quadrature Droop Input10 ohms burden
Max. sensitivity: 0.22 A for 5% droop 0PF
Max. input: 0.33A
EnvironmentalVibration20-100 Hz,50mm/se
100Hz – 2kHz, 3.3g
Operating temperature-40 to +70 Deg. C
Relative Humidity 0-70 Deg.95%
Storage temperature-55 to +80 Deg.

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1 review for AVR MX321 Automatic Voltage Regulator for Stamford Diesel Generator

    Daniel Tyler
    November 17, 2022
    Really fast shipping to canada, well priced. And works great. I ordered an oem one also at the same time from within Canada, and received this one 3 days before the othe rone. Kudos to this seller!
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