McPherson Controls | Voltage Regulator | ADVR-250

Dependable, proven performance. McPherson Controls technical experience and innovative engineering delivers high quality performance.

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McPherson Controls | Voltage Regulator | ADVR-250


  • Replaces  Leroy Somer R250 

Available on backorder. Usually ships in 3 to 5 business days.

can be export

Product can be export to the Caribbean, Latin America and other parts of the world with an additional payment.

Chat with one of our customer service representatives for shipping from USA to your country.

IMPORTANT: Before adding your product to the cart, contact us to check the availability of the product you wish to buy. We want to serve you as you deserve.

You count on our help to help you buy the product you need. To avoid purchasing the wrong product, please contact us before purchasing by WhatsApp (button on this page), by phone at +1.954.657.7777 or by email at We have trained personnel, with more than 15 years of experience in handling manufacturer's tools: printed parts manuals, Power Parts online (electronic parts catalog), Product 360 (product configuration and kits that comprise it, as it was assembled in the factory), intranet Bill of Materials, among others. That is, we can determine 100% unequivocally which is the product you need.

Additional Info


Details and Specifications

  • 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 

Product Specifications:

Sensing Input
(Average Reading) 
Voltage 85 to 140 Vac 1 phase 2 wire 

Frequency 50/60 Hz Potentiometer setting 

Excitation Output 120 Vac 1 phase Continuous 63 Vdc 3.5A Max. 110 Vdc 5A for 10 seconds 

Resistance Min. 18 ohms Max. 100 ohms 

Fuse Spec. Slow blow 5 x 20 mm 8A 

External Voltage Adjustment Max. +/-14% @ 1K ohm 1 watt potentiometer 
Voltage Regulation Less than +/-0.5% (with 4% engine governing) 
Build Up Voltage 5Vac 25Hz residual volts at power input terminal 
Soft Start Ramp Time 3 seconds +/-10% 
Typical System Response Less than 20 ms 
EMI Suppression Internal electromagnetic interference filtering 
Static Power Dissipation Max. 4 watts 
Under Frequency Protection
(Factory Presets) 
50 Hz system knee point at 48 Hz 

60 Hz system 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 


M5L35 Screw x 4 
6.35 mm Flag Type Terminal x 1 
6.35 mm connection PIN x 2 


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% 

PRODUCT Related documents:

ADVR-250 Manual

EA-230_ADVR-250 Comparison Table

Additional Info
Weight1.5 lbs
Dimensions6.25 × 3.75 × 2.5 in


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