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SP Powerworld

SP Powerworld EA321 AVR

SP Powerworld EA321 AVR

Regular price £294.00 GBP
Regular price Sale price £294.00 GBP
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SP Powerworld EA321 Compatible Automatic Voltage Regulator is a direct replacement for the Original Stamford* MX341 (E000-23212/1P).

£245.00 plus VAT

Accepted worldwide as the only Quality and Legal aftermarket replacement. It's been designed to work in exactly the same way and operates at the same performance. It’s the same size, function and has the same wiring connections, it also comes with 12 months warranty. The EA321 is also Compatible with the following models:

MX321-2 - E000-23212 - E000-23212/1P - Onan 305-0823.

Ex stock - shipped Worldwide. For EURO or USD pricing please contact us:


Tel: +44 (0)115 923 2568 (United Kingdom)

Tel: (24-hour) +44 (0)7484709956 (United Kingdom)

*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 manufacturers.


  • Voltage regulation less than +/-0.5% RMS
  • For use in parallel operation
  • RAMP, DIP, DWELL, DROOP, RMS, U/F, Over Voltage and Over Excitation Adjustment Functions
  • Over Exc. / Over Volt. and UFRO LED indicators
  • Current limiting function


Sensing Input
  • Voltage 190 to 264 Vac 3 phase
  • Frequency 50/60 Hz selectable
Power Input (PMG)
  • Voltage 170 to 220 Vac 3 phase 3 wire
  • Current 3A / phase
  • Frequency 100 to 120 Hz nominal
Excitation Output
  • Voltage Max. 120 Vdc @ power input 220 Vac
  • Current Continuous 4A Intermittent 7A for 60 seconds
  • Resistance Min. 15 ohms
External Voltage Adjustment
  • Max. +/-10% @ 5K ohms 1 watt potentiometer
Voltage Regulation
  • Less than +/-0.5% RMS (with 4% engine governing)
Build Up Voltage
  • 5Vac residual volts at power input terminal
Soft Start Ramp Time
  • 0.4 to 4 seconds
Static Power Dissipation
  • Max. 18 watts
Quadrature Droop Input
  • Burden 10 ohms
  • Max. Input 0.33A
  • Max. Sensitivity 0.22A for 5% droop (PF=0)
Analogue Voltage Input
  • Input Resistance 1K ohm
  • Max. Input +/-5 Vdc
  • Sensitivity 1V for 5% generator volt
Over Voltage Detector Input
  • Set Point 300V
  • Time Delay 1 second (fixed)
  • CB trip coil volt 10 to 30 Vdc / 0.5 Amp
Current Limit Input
  • Burden 10 ohms
  • Sensitivity Range 0.5A to 1A
Under Frequency Protection (Factory Presets)
  • Set Point 95% Hz
  • Slope 100 to 300% down to 30 Hz
Over Excitation Protection
  • Set Point 120 Vdc
  • Time Delay 8 to 15 seconds
Voltage Thermal Drift
  • Less than 5% at temperature range -40 to +70 °C

AVR Control Functions

  • Voltage adjustment
  • Stability adjustment
  • Setting under frequency protection knee point
  • To set the Droop to 5% at PF=0
  • To optimize analogue input sensitivity
  • Over excitation trip level set
  • Hz related voltage DIP set
  • Hz related recovery time set
  • Stator current limit set
  • Over voltage trip level set
  • No load voltage Ramp set time
  • Root mean square of generator


Operating Temperature
  • -40 to +70 °C
Storage Temperature
  • -40 to +85 °C
Relative Humidity
  • Max. 95%
  • 3.3 Gs @ 100 to 2K Hz

Physical Specifications

  • 203.5 (L) x 153.6 (W) x 43.5 (H) mm
  • 530 g +/-2%


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  • Genuine Products with Full Warranty

    We are aware that there are poorly made illegal Chinese counterfeit models available on the market. Please note our products are Genuine, come with full warranty and have been sourced directly from the factory.

  • Worldwide Shipping

    All items are shipped from the United Kingdom and we cover all of Europe and the rest of the world. For an accurate DHL Quotation please contact us.