• Guangdong ALI Testing Equipment Co,.Ltd
    K.S. LIM
    Your genset and ATS are working well. I have given your name and email to a friend who will be building a hotel in Palawan. Thanks,
  • Guangdong ALI Testing Equipment Co,.Ltd
    Thanks always giving me good products. thanks for your effort you done before. your firend from Egypt.
  • Guangdong ALI Testing Equipment Co,.Ltd
    Akakulubelwa Mwiyakui-Zambia
    I must confess you have a brilliant customer relations skills and i am learning from you. I tell you if you want to see how beautiful Zambia in Africa
Contact Person : Kris
Phone Number : 0086-0769-85914911
WhatsApp : +8618046939311

Leroy Somer Alternator Automatic Voltage Regulators AVR R449

Place of Origin France
Brand Name GSKA
Model Number R449
Minimum Order Quantity 1-5 pieces
Price Negotiable
Packaging Details Carton box
Delivery Time Within 7 days after 100% payment
Payment Terms T/T,Western Union,Cash or L/C
Supply Ability 500 pieces per Month

Contact me for free samples and coupons.

Whatsapp:0086 18588475571

Wechat: 0086 18588475571

Skype: sales10@aixton.com

If you have any concern, we provide 24-hour online help.

Product Details
High Light

automatic ac voltage regulator


avr automatic voltage regulators

Leave a Message
Product Description


Leroy Somer Alternator Automatic Voltage Regulators AVR R449


The circuitry of the R449 Automatic Voltage Regulator (AVR) provides closed loop control of the alternator output voltage by regulating the exciter field current. Which can be powered by either AREP or the PMG field excitation systems and is fitted as standard on 8100 Series Alternators & 9100 Series Alternators. The primary winding has a voltage in ratio to that of the alternator (characteristic shunt), the next has a voltage in proportion to the stator current (compound characteristic: booster effect). Which is powered by two auxiliary windings which are independent of the voltage equal circuit. The power supply voltage is rectified and filtered before being used by the AVR monitoring transistor. With PMG excitatioin, a permanent magnet generator (PMG) added to the alternator supplies the AVR with voltage which is free of the main alternator winding. This is built-in at the rear of the machine and connected to the R448 AVR, and the ST9 jumper must be disconnected.


R 449 voltage Regulator is of a shunt type. It is designed to fit as Standard on A50 to A54 alternators. It can be supplied with power either by a power VT, or by the AREP field excitation system, or by a single-phase or 3-phase PMG, Using the R 726 external module, the regulator can control the power Factor (2F) and can match the alternator voltage to the mains voltage (3F) prior to synchronization. 


*Quadrature droop adjustment


*AVR Voltage adjustment


*Stability adjustment


*LAM Threshold (underspeed) adjustment


*Excitation ceiling adjustment


*Selection of single phase or three phase


*voltage sensing


*Selection of normal or rapid response time


*50 Hz or 60 Hz frequency option


*Remote voltage adjustment option


*LAM enable/disable option


*Alternator frame selection


*Excitation system selection




Input voltage: 70-140V AC, (PMG, or auxiliary winding, single, three phases)
Reaction is measured : 90-480V AC
MAX. output :DC 10A 125V
Function: Built-in low-speed , over excitation LAm



Voltage regulation ± 0.5%
Remote voltage adjustment range ± 5%
Short circuit capability 3 x Irated for 10 seconds
Voltage sensing 95 to 140 volts (50/60 Hz)
170 to 260 volts (50/60 Hz)
340 to 520 volts (50/60 Hz)
Response time Normal (1 sec) for ± 20% voltage variation
Rapid (0.3 sec) for ± 20% voltage variation


Sensing voltage

terminal 0-110V=95-140V

terminal 0-220V =170-260V

terminal 0-380V=340-520V

Frequency 50-60Hz
Voltage input 40-50VAC, 3 phase
Harmpnic auxiliary winding 6-150VAC (no-load rms)
Output Voltage max 160VDC at 120VAC input
Current max 10A
Resistance 15 ohms minimum
Regulation +/-5% RMS with 4% engine governing
Voltage build-up Residual voltage at avr terminal≥5VAC
External Voltage Adjustment +/-10% with 1k ohm 1 watt trimmer
Generator Power 50-300kw


Leroy Somer Alternator Automatic Voltage Regulators AVR R449 0

Shipment Term


1. We Ship to Worldwide, except APO/FPO


2. Orders processed timely after showing remittance copy.

3. We only ship to confirmed order addresses. Your order address MUST MATCH your address.


4.Items are shipped from China by Airmail, reach most of the countries within 4 to 20 business days.


5.Delivery time depends on destination and other factors, it may takes up to 20 business days.


automatic voltage regulator R448 3 phase generator avr

6. SERVICE TRANSIT TIME is provided by the carrier and excludes weekends and holidays. Transit times may vary, particularly during the holiday season.


7. If you have not received your shipment within 30 days from payment, please contact us. We will track the shipment and get back to you as soon as possible with a reply. Our goal is customer satisfaction!




1. Guarantee:1 year after selled.

2. During guarantee,the items share free repairs or replacement.

3. Customer is responsible for the freight come-and-go,and the custom tax.

4. You may consider to send the defective item with a economical way,and we send back the repaired items with your new order together.

5. To save the cost,pls send the item back without packing.

6. Pls provide the defective appearance and related invoice number.

7.We do not repair or replace item with an expired warranty.

8.All emails will be answered within 1 business day. If you do not receive our reply, please kindly re-sent your email or give us a call any time.