Leroy Somer R438

Leroy Somer R438 voltage regulator. Original product. The Leroy Somer R438 is an analog A.V.R. It is designed for alternators with a AREP or PMG excitation. R438 controls the excitation current in order to maintain the output voltage of the alternator. R438 is performant in terms of voltage regulation, simple to set , to use and is reliable. It can run without LAM (U/f), or with LAM, selection is done by strap ST5.