The IPUA448 is an replacement alternator automatic voltage regulator for Leroy Somer R448, R449 and R438.

Aftermarket replacement AVR for Leroy Somer Partner range alternators. This self excited automatic voltage regulator ‘drops straight in’, fitting permanent magnet, AREP and auxiliary winding type Leroy Somer generators. Replaces Leroy Somer part number R448.

Also replaces:

  • FG Wilson 922-124
  • Leroy Somer 9AR448
  • Leroy Somer AEM110RE016
  • Leroy Somer R438
  • Leroy Somer R448
  • Leroy Somer R449


  • Load acceptance module (LAM)
  • Under frequency & exc. max protection
  • Single phase or three phase voltage sensing optional
  • Soft start voltage ramping
  • Normal rapid response time (option)
  • Control Functions – VOLT, STAB, UFRO, EXC MAX, STAT