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Generator Automatic Voltage Regulator 64 VDC 4 Amp

The SP Powerworld EA04A Compatible AVR is a direct replacement for the Original Basler VR63-4 & VR63-4A. 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.

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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 < ±1%
  • For Use In 50/60 Hz Brushless Generators
  • Optional 120/240 VAC Sensing Voltage Switch
  • Under Frequency & Over Excitation Protection
  • EMI Suppression
  • Built-in High Breaking Capacity Fuse*

*Basler Model VR63-4A only fits 120 VAC Generators, and Basler Model VR63-4 only fits 240 VAC Generators respectively, and both original Basler models do not have fuse protection.


Model NO. EA04A
Sensing & Power Input Voltage 120(90~132) / 240(171~264)VAC DIP switch selectable
Frequency 50/60 Hz selectable
Output Voltage Max. 32 VDC @ 120 VAC input , Max. 63 VDC @ 240 VAC input
Current Continuous 4A, Intermittent 7A for 60 sec.
Resistance Min. 15 Ohm Max. 100 Ohm
Voltage Regulation < ±1% (with 4% engine governing)
Voltage Build-up Residual volts at AVR terminal > 5 VAC
External Volts Adjustment ±15% with 1 K Ohm 1 watt trimmer
Unit Power Dissipation Max. 8 watt
EMI Suppression Internal electromagnetic interference filtering
Thermal Drift 0.05% per °C change in AVR ambient
Under Frequency Protection
(Factory Setting)
60 Hz system presets knee point at 55 Hz
50 Hz system presets knee point at 45 Hz
Over Excitation Shutdown Field volts shut down after a time delay if exciter field volts exceed 100±5 VDC
Environment Operating Temperature : -40~60 °C
Storage Temperature : -40~85 °C
Relative Humidity : Maximum 90%
Vibration : 1.5G @ 5~30 Hz / 5.0G @ 30~500 Hz
AVR Controls Functions VOLTS : Voltage Adjustment
STAB : Stability Adjustment
Dimensions 100.0 (L) x 68.5 (W) x 33.0 (H) mm
Weight 230 g ±2%

*Note : All features & specifications subject to change without notice.