Marelli AVR M40FA640A – Automatic Voltage Regulator

The Marelli M40FA640A is a high-performance Automatic Voltage Regulator (AVR) designed for large Marelli Motori alternators and medium- to high-capacity generator systems. It provides precise voltage regulation by controlling excitation current, ensuring stable output under varying load and environmental conditions. Built with advanced electronic circuitry and heavy-duty components, the M40FA640A guarantees superior performance, long-term reliability, and efficient operation in demanding industrial applications.

Key Specifications:

• Voltage Regulation: ±1% steady-state accuracy

• Input Supply: 50/60 Hz, 190–480 V AC sensing

• Output Current: Up to 10 A continuous

• Excitation System: Compatible with SHUNT, AREP, and PMG excitation

• Protection: Built-in over-excitation, thermal, and under-frequency protection

• Design: Rugged and compact design for easy installation and serviceability

• Compatibility: Suitable for Marelli Motori MJB, MXB, and large industrial alternators