The A059F437 is a Genuine OEM AS540 AVR Assembly for STAMFORD generators. This automatic voltage regulator maintains stable output voltage across varying load conditions in Cummins alternators. Professional-grade reliability. The AS540 is an Automatic Voltage Regulator from STAMFORD supporting both self-excited (shunt) and Permanent Magnet Generator (PMG) excitation modes. It is the modern AVR for the S0 alternator family and select compact STAMFORD frames.

Key features

• Dual-mode operation: self-excited or PMG-powered
• Compact footprint with screwdriver-accessible trim adjustments
• Soft-start, UFRO, droop, and stability settings
• 50-60 Hz operation