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SP Powerworld ADVR-250

Hybrid Analog/Digital 2 lines sensing Automatic Voltage Regulator 5 Amp

The SP Powerworld ADVR-250 Compatible Voltage Regulator is a direct replacement for the Original Leroy Somer R250 & R230 models.

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.

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

Sales: [email protected]

Office: [email protected]

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.



  • Compact size, robust and high reliability
  • Innovative heat sink significantly increases cooling efficiency
  • Load Acceptance Module (LAM) protection
  • Soft start voltage ramping
  • Over excitation protection
  • Digital low frequency protection circuit, prevents thermal drift
  • EMI suppression
  • Built-in high capacity fuse


Sensing & Power Input
(Average Reading) Voltage 85 to 140 Vac 1 phase 2 wire
Frequency 50/60 Hz (Potentiometer setting)

Excitation Output 63 Vdc @ 120 Vac single phase
continuous 5A Max. 110 Vdc 5A for 10 seconds

Excitation Resistance Min. 18 ohms
Max. 100 ohms

Fuse Spec. Slow blow 5 x 20 mm 8A

External Volts Adjustment +/-14% with 1 kΩ 1 watt trimmer

Build Up Voltage Residual volts at power input terminal > 5 Vac 25 Hz

Soft Start Ramp Time 3 seconds +/-10%

Volts Regulation Less than +/-0.5% (with 4% engine governing)

Response Time Less than 20 ms

Static Power Dissipation Max. 4 watts

EMI Suppression Internal electromagnetic interference filtering

Under Frequency Protection
(Factory Setting) 50 Hz system presets knee point at 48 Hz
60 Hz system presets knee point at 58 Hz

Over Excitation Current Limiting Excitation Current 5A +/-10%

Voltage Thermal Drift Less than 3% at -40 to +70 °C

Under Frequency Knee Point Thermal Drift Less than +/-0.1 Hz at -40 to +70 °C


Operating Temperature -40 to +70 °C

Storage Temperature -40 to +85 °C

Relative Humidity Max. 95%

Vibration 5.5 Gs @ 60 Hz

Physical Specifications

Dimensions 140.0 (L) x 81.0 (W) x 46.0 (H) mm
5.51 (L) x 3.19 (W) x 1.81 (H) inch

Weight 300 g +/-2%
0.66 lb +/-2%