Generator AVR, Automatic Voltage Regulators
- Part Number AS440 |AVR M40FA610A|AVR R250|AVR MX341|AVR AJ37-J10 |M31FA600A / 11000317 R450M D350 DSR SX460 A6762/05
- Brand Stamford Leroy Somer, France Marelli Motori, Mecc Alte, Italy Genuine OEM, Multi-brand equivalent Leroy Somer / Nidec
- Country of Origin UK / France /China
- Voltage Options 400V, 600V
- Warranty offered by the Manufacturer
- Bulk supply: Minimum order quantity applies. Request bulk pricing based on your required volume
- Compatible · Olympian, FG Wilson, Caterpillar
- Pictures are for referency only Not sure which AVR you need? Send us the part number stamped on your existing AVR, or your generator's make and model, and we'll confirm the correct match before you order.
Generator AVR, Automatic Voltage Regulators
If your generator’s output voltage is unstable, or you’re replacing a failed AVR, you’re usually searching one of three ways: by the part number printed on the old unit, by your generator brand, or by the alternator brand. Five real models are built out fully below, jump to yours.
Not sure which one fits? Send us the part number on your existing AVR, or your generator’s make and model, and we’ll confirm before you order.
Stamford AVR AS440
AS440 Stamford · Genuine OEM Genuine Stamford automatic voltage regulator, manufactured in the UK and France, built for precise voltage control on Stamford-fitted diesel generator alternators.
- Genuine Stamford manufacture, not an equivalent or aftermarket copy
- Manufactured in the UK and France
- Available in 400V and 600V configurations
Fits Stamford alternator ranges on prime and standby generators
AVR M40FA610A
M40FA610ACompatible · Olympian, FG Wilson, CaterpillarCompatible automatic voltage regulator confirmed for Olympian, FG Wilson, and Caterpillar diesel generators, a direct replacement for failed factory-fitted units on these brands.
- Confirmed fitment for Olympian generator sets
- Confirmed fitment for FG Wilson generator sets
- Confirmed fitment for Caterpillar generator sets
- Compact housing, straightforward like-for-like replacement
AVR R250
R250 Leroy Somer / Nidec Automatic voltage regulator for brushless alternators, manufactured under the Leroy Somer and Nidec brands, built to hold stable output under varying generator load.
- Leroy Somer / Nidec brand manufacture
- Built for brushless alternator systems
- Suited to diesel and gas generator applications
AVR MX341
MX341 Stamford-equivalentStamford-equivalent automatic voltage regulator for brushless synchronous generators, a compatible replacement where a genuine Stamford unit isn’t required.
- Equivalent specification to Stamford MX341
- Built for brushless synchronous generator systems
- Suited to industrial and commercial generator sets
AVR AJ37-J10
AJ37-J10 Multi-brand equivalent Compatible automatic voltage regulator offered as an equivalent to Stamford, Leroy-Somer, Mecc Alte, Basler, and Marathon models, for buyers needing a cross-brand replacement.
- Cross-compatible with Stamford, Leroy-Somer, Mecc Alte, Basler, and Marathon equivalents
- Suited to generators where the original brand’s AVR is unavailable
AVR M31FA600A / MEC-20
- Built for Marelli Motori MJB / MXB-E synchronous alternator ranges
- Three-phase voltage sensing for improved accuracy under unbalanced load
- Suited to high-end marine and oil & gas gensets where OEM-exact interchange matters
- Also cross-referenced as MEC-20, M31FA600A-MEC-20, and 11000317
AVR R450M
- Compatible with SHUNT, AREP, and PMG excitation systems
- Rated excitation current up to 6A with ±0.5% regulation accuracy
- Integrated Load Acceptance Module (LAM) for sudden load impact events
- Over-excitation limitation, loss-of-sensing protection, and voltage droop for genset paralleling
- “M” variant fitted with Mate-N-Lok connectors for standard LSA 42.2–50.2 alternators
AVR D350
- Compatible with SHUNT, AREP, and PMG excitation systems
- Rated excitation current up to 5A with tighter ±0.25% regulation accuracy
- Configurable via Leroy-Somer’s EasyReg Advanced software
- Speed detection with over- and under-speed alarms, plus Load Acceptance Module (LAM)
- Fits LSA 40, 42.3, 44.3, 46.3, 47.2, 49.3, 50.2 and TAL alternator ranges
AVR DSR A6762/05
- Standard-fit regulator for Mecc Alte ECO and ECP series alternators
- Fast on/fast-off connector block for quick reconnection on 12-wire machines
- Connects via RS232, USB, or RS485 Modbus for remote monitoring and alarm log download
- Compatible with MAUX auxiliary winding systems and PMG excitation without changing regulator
- Firmware revision 05 supports current diagnostic and communication software
AVR SX460
- Self-excited design draws power directly from the generator terminals
- Compact form factor fits most existing control enclosures
- Built-in over-excitation and low-frequency (under-speed) protection
- Also cross-referenced as 305-0982 / 3050982 on some genuine Stamford listings
- Note: Stamford’s OEM line lists the SX460 as superseded by the AS440 , this listing covers the widely-stocked compatible equivalent
No additional information available.
