Leroy Somer AVR D550 – Automatic Voltage Regulator
The D550 is a high-performance Automatic Voltage Regulator (AVR) developed by Leroy Somer for precise voltage control in brushless alternators. It ensures exceptional voltage stability, fast response to load changes, and reliable operation in demanding environments. The D550 features advanced protection, easy configuration, and compatibility with digital monitoring systems — making it ideal for industrial, commercial, and marine generator applications.

Key Specifications:

• Voltage Sensing: 190–520V AC (single or three phase)

• Frequency Range: 15–100 Hz

• Excitation Voltage: Max 110V DC @ 4A continuous (10A for 10s)

• Regulation Accuracy: ±0.5%

• Operating Temperature: –40°C to +70°C

• Build Type: Fully encapsulated, resistant to vibration, dust, and moisture

• Compatibility: Designed for Leroy Somer alternators and compatible generator systems

• Special Features: Advanced protection, digital adjustment options, and high transient performance