Spares / Alternators and Spares / Leroy Somer Alternators and Spares / Leroy Somer AVR

Leroy Somer D350 AVR

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$1,339.80$1,071.40 inc GST($974.00 ex GST)
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Genuine Leroy Somer D350 digital automatic voltage regulator (AVR) for industrial alternators provides excitation current up to 5A with excellent reliability for permanent magnet (PMG) or AREP (auxiliary winding) excitation types.

Designed to fit LSA40 to LSA52.3 and TAL 40 to TAL 49 alternators with SHUNT, permanent magnet (PMG) or AREP (auxiliary winding) excitation types.

These are new and GENUINE LEROY SOMER AVRs direct from the factory.

Replaces the Analog R438 AVR.


Leroy Somer stopped production of the R438, superseding this to the new D350 Digital AVR. 

These new Digital AVR types requires -

  • The installation of new plugs and pins to suit the D350 AVR,
  • The AVR needs to be programmed with Easy Reg software using with the appropriate config cables.
  • NFLink Configuration Cable Kit.

For customers wanting a direct Plug n Play replacement, we can offer the MAXIAVR R438 AVR.

D350 includes advanced protections such as over-excitation limitation and voltage sensing loss. It also includes speed detection capabilities, with over- and under-speed alarms. D350 also features voltage droop for Genset parallel operation, and it is equipped with a Load Acceptance Module (LAM) to handle load impact events.

Key specifications

Excitation modeSHUNT, AREP, PMG
Rated excitation current5 A
Regulation accuracy (+/- %)0.25 %
Frequency range10 – 100 Hz
Voltage setting range (+/- %)10 %
kU/F limitation0.5 < k< 3
Loss of sensing voltage
Over-excitation limitation
Short circuit current limitation
Voltage droop
Parallel operation between alternators
Load Acceptance Module (LAM)

Compatible products

LSA 40
LSA 42.3
LSA 44.3
LSA 46.3
LSA 47.2
LSA 49.3
LSA 50.2
TAL 40
TAL 42
TAL 44
TAL 46
TAL 47
TAL 49

Configuration & setup

D350 can be configured using the Leroy-Somer EasyReg Advanced software.

NFLink Configuration Module for LEROY SOMER AVR