Alternator Spare Parts

The AS440 is an analogue, 2-phase sensing, self-excited automatic voltage regulator (AVR). The AS440 incorporates Surface Mount Technology (SMT) to its design.
The AS440 is supplied as standard to the STAMFORD® S4 and STAMFORD® HC5 alternators and is an option for the STAMFORD® UC22 and UC27 alternators.

Attention please!
The AVR SX460 is now obsolete and replaced by the AVR AS440. The production of original Stamford AVR SX460 is definitely discontinued.
The SX460 is an analogue, 2-phase sensing, self-excited automatic voltage regulator (AVR). The AVR is linked with the main stator windings and the exciter field windings to provide closed loop control of the output voltage.
The SX460 is most commonly used on Stamford alternator UC range and are supplied as standard to the UC22 and UC27 alternators.

The MX321 analogue, 3-phase sensing, permanent magnet generator (PMG) powered automatic voltage regulator (AVR) provides isolation from the effects of non-linear loads, improved motor starting performance and sustained short circuit current.
The MX321 AVR is provided as standard for the STAMFORD S6 and HC6 alternators and can also be provided as an option across the STAMFORD range.

The MX341 is an analogue, 2-phase sensing, permanent magnet generator (PMG) powered automatic voltage regulator (AVR) providing isolation from the effects of non-linear loads. It has improved motor starting performance and sustained short circuit current.
The MX341 is provided as standard for the STAMFORD P6, STAMFORD P7 and STAMFORD S7 alternators.

The AS480 is an analogue, 2-phase sensing, self-excited automatic voltage regulator (AVR) incorporating an interface for the optional Excitation Boost System (EBS) for improved motor starting performance and sustained short circuit.
The AS480 is provided as standard on STAMFORD P0 and P1 alternators.

Leroy Somer AVR R220, for shunt alternators.
For LSA40 & LSA42.3 series alternators.
R220 is an analog AVR with power controled by transistors. It is designed for small alternators with a SHUNT excitation.
R220 controls the excitation current in order to maintain the output voltage of the alternator. R220 is performant in terms of voltage regulation, simple to set , to use and is reliable.
It is in compliance with I.E.C. 60034-1 standard and U.L. 508 / C.S.A. approved.

Leroy Somer AVR R250, for shunt alternators.
For LSA44.3, LSA46.3 & LSA47.2 series alternators.​
R250 is an analog AVR with power controled by transistors. It is designed for small alternators with a SHUNT excitation.
R250 controls the excitation current in order to maintain the output voltage of the alternator. R250 is performant in terms of voltage regulation, simple to set, to use and is reliable.
It is in compliance with I.E.C. 60034-1 standard and U.L. 508 / C.S.A. approved.