Marathon PM500 – Voltage Regulator for Marathon Generators

The Marathon PM500 is a high-performance automatic voltage regulator designed for Marathon AC generators. It provides precise control of the exciter field current to maintain a stable generator output voltage, even under heavy load changes. This AVR is built for reliability, durability, and smooth generator performance.

Key Features

• Supports single-phase and three-phase sensing

• Wide voltage sensing range: 175–600V AC

• Excellent voltage regulation accuracy: ±0.25%

• Strong short-circuit and motor-start capability

• Remote voltage adjustment available (0–10V DC or ±5V)

• Built-in protection features:

  • Over-excitation

  • Under-frequency roll-off

  • Over-voltage protection

• Rugged industrial design for harsh environments

• Compact and easy to install inside the generator terminal box