Overview

The R120 Leroy Somer Automatic Voltage Regulator (AVR) is a precision-engineered OEM component designed to maintain stable voltage output in generator systems powered by Leroy Somer alternators. Manufactured exclusively in France by Leroy Somer, this genuine AVR ensures your generator delivers consistent, reliable power by automatically adjusting the excitation current to the alternator's rotor. Whether you're operating critical backup power systems, industrial generators, or mobile power units, the R120 AVR provides the voltage stability essential for protecting sensitive equipment and ensuring uninterrupted operation. This compact, robust voltage regulator is built to withstand demanding environmental conditions while delivering precise voltage control across varying load conditions.

As an original equipment manufacturer (OEM) part, the R120 AVR is engineered to exact specifications for seamless integration with compatible Leroy Somer alternator models. Unlike aftermarket alternatives, this genuine Leroy Somer voltage regulator guarantees optimal performance, longevity, and compatibility with your generator system. The R120 features advanced circuitry that responds instantly to load changes, maintaining voltage stability within tight tolerances to prevent equipment damage and ensure safe, efficient power generation. When your generator's voltage regulation fails, replacing the AVR with a genuine R120 unit restores factory performance and protects your investment in quality power generation equipment.

Key Specifications

Compatible Alternator Models

The Leroy Somer R120 AVR is specifically designed for use with a comprehensive range of Leroy Somer alternator models, ensuring broad compatibility across their generator product lines. This voltage regulator is factory-specified for the following alternator series: TAL040 B, TAL040 C, TAL040 C1, TAL040 D, TAL040 E, TAL040 F, TAL042 A, TAL042 B, TAL042 C, TAL042 D, TAL042 E, TAL042 F, TAL043 A, TAL043 B, TAL043 C, TAL043 D, TAL043 E, TAL044 A, TAL044 B, TAL044 C, TAL044 D, TAL044 E, TAL045 A, TAL045 B, TAL045 C, TAL046 A, TAL046 B, TAL046 C, and TAL046 D. These TAL series alternators are commonly found in industrial standby power systems, rental fleet generators, mobile power applications, and emergency backup installations. When ordering replacement AVRs, always verify your alternator model number and serial plate information to confirm compatibility. The R120 is also used in various LSA (Leroy Somer Alternator) series configurations where specified by factory documentation. If you need assistance confirming compatibility with your specific generator or alternator model, our technical support team at 1-888-769-3758 can provide expert guidance to ensure you order the correct voltage regulator for your application.

Why Buy from General Power

General Power is an authorized dealer of genuine Leroy Somer parts, providing customers with factory-original components backed by manufacturer warranties and expert technical support. When you purchase the R120 AVR from General Power, you receive a genuine OEM product manufactured to exact Leroy Somer specifications—not an aftermarket substitute that may compromise performance or void your generator warranty. We maintain extensive inventory of generator parts and AVRs, enabling same-day shipping on most orders placed before our cutoff time, minimizing your equipment downtime. Our knowledgeable staff includes bilingual English and French-speaking representatives who understand generator systems and can provide technical assistance, compatibility verification, and installation guidance. With decades of experience serving the power generation industry, General Power has built a reputation for reliability, competitive pricing, and customer service excellence. Contact our team at 1-888-769-3758 for personalized assistance, bulk pricing inquiries, or technical support. We're committed to keeping your generator running with genuine parts, fast delivery, and the expertise you need to maintain critical power systems.

Installation Overview

Installing the R120 Leroy Somer AVR requires basic electrical knowledge and adherence to safety protocols. Follow these general steps for AVR replacement:

• Step 1: Safety First – Completely shut down the generator and disconnect all power sources. Allow the unit to cool if it has been running. Lockout/tagout procedures should be followed to prevent accidental startup during maintenance.
• Step 2: Access and Remove Old AVR – Remove the alternator end cover or access panel to locate the existing AVR. Document or photograph all wire connections before disconnecting them. Carefully label each wire if not already marked to ensure correct reconnection.
• Step 3: Install New R120 AVR – Mount the new R120 voltage regulator in the same position as the old unit, ensuring proper orientation and secure mounting. Reconnect all wires according to your documentation or the wiring diagram provided with the AVR, ensuring tight, clean connections.
• Step 4: Testing and Calibration – Replace the alternator cover, restore power, and start the generator under no-load conditions. Monitor voltage output and verify proper regulation. Adjust voltage settings according to Leroy Somer specifications if needed. Test under load conditions to confirm stable voltage regulation across the operating range.

Note: This overview is for general guidance only. Always consult the official Leroy Somer installation manual and wiring diagrams specific to your alternator model. If you're not qualified to perform electrical work on generator systems, hire a certified technician to ensure safe, proper installation.

Frequently Asked Questions

Q: What does the R120 AVR do in my generator system?
A: The R120 Automatic Voltage Regulator controls the excitation current to your alternator's rotor, automatically adjusting it to maintain stable output voltage despite changes in load or engine speed. This protects connected equipment from voltage fluctuations and ensures consistent power quality.

Q: How do I know if my R120 AVR is failing?
A: Common symptoms of AVR failure include unstable voltage output, inability to maintain set voltage under load, over-voltage or under-voltage conditions, erratic voltage fluctuations, or complete loss of generator output voltage. If you experience these issues after ruling out other causes, the AVR likely needs replacement.

Q: Is this a genuine OEM Leroy Somer part or an aftermarket replacement?
A: General Power supplies only genuine OEM Leroy Somer R120 AVRs manufactured in France by Leroy Somer. This is not an aftermarket copy or compatible substitute—it's the exact same voltage regulator that came with your alternator from the factory, ensuring perfect fit, performance, and reliability.

Q: What warranty comes with the R120 AVR?
A: As an authorized Leroy Somer dealer, we provide genuine OEM parts backed by the manufacturer's standard warranty. Warranty terms vary by application and installation conditions. Contact our team at 1-888-769-3758 for specific warranty information applicable to your purchase.

Q: Can I get technical support for installation and troubleshooting?
A: Absolutely. General Power provides comprehensive technical support for all products we sell. Our experienced staff can assist with compatibility verification, installation guidance, troubleshooting, and wiring questions. Reach us at 1-888-769-3758 for bilingual English/French technical assistance.

Order Today

Don't let a failed voltage regulator compromise your generator's performance or damage sensitive equipment. Order your genuine Leroy Somer R120 AVR from General Power today and restore factory-quality voltage regulation to your power system. With our extensive inventory, same-day shipping capabilities, and commitment to authentic OEM parts, we're your trusted source for critical generator components. Whether you need a single replacement AVR or multiple units for fleet maintenance, our competitive pricing and volume discounts make General Power your best value for genuine Leroy Somer parts. Call 1-888-769-3758 now to place your order, verify compatibility, or speak with our knowledgeable team about your generator parts needs. Keep your power systems running reliably with genuine parts, expert support, and the fast service you expect from General Power—your authorized Leroy Somer parts distributor.