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Photo Coupler Automatic Voltage Regulator (Infrared)

The EA-KOH self excited genset voltage regulator is a Compatible Replacement for Kohler infrared photo coupler C-255670 & B-255670 regulators.

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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 manufacturer.


  • Voltage Regulation < ±1%
  • Drive Infrared LED to Control Excitation
  • 50/60 Hz Optional
  • Under Frequency Protection
  • Adjustable Stability
  • External Voltage Trimmer Applicable


Model NO. EA-KOH
Sensing Input Voltage 220 VAC 1 phase 2 wire
Frequency 50/60 Hz select by jumper
Power Input Voltage 10~26 VDC
Output Current 20 Amp
Volts Regulation < ±1% (with 4% engine governing)
External Volts Adjustment ±10% with 1 K Ohm 1 watt trimmer
Unit Power Dissipation Max. 2 watt
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
Environment Operating Temperature : -40~65 °C
Storage Temperature : -40~80 °C
Relative Humidity : Maximum 95%
Vibration : 3.3G @ 100~2 KHz
AVR Controls Functions STAB : Stability Adjustment
Dimensions 127.2 (L) x 141.5 (W) x 39.0 (H) mm
Weight 109 g ±2%

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