AS440 AVR Automatic Voltage Regulator

AS440 Voltage Regulator – High Performance AVR for Stamford-Type Alternators

The AS440 is a powerful, self-excited automatic voltage regulator (AVR) designed for use in Stamford-type brushless alternators. It provides accurate voltage regulation, excellent transient response, and enhanced control features, making it suitable for demanding industrial and commercial generator applications.

Unlike more basic models, the AS440 supports optional external voltage sensing and includes robust protection systems, making it ideal for systems where voltage precision and fault tolerance are critical.

Key Features:

• Self-Excited and External Sensing: Compatible with self-excited alternators and offers optional external voltage sensing for improved regulation accuracy.
• Voltage Regulation Accuracy: Maintains output within ±1% under steady-state conditions.
• Built-in Protection: Includes over-excitation, loss of sensing, and under-frequency protection features.
• Adjustable Parameters: User-adjustable voltage, stability, and under-frequency settings using onboard potentiometers.
• Soft Start & Voltage Ramp: Gradual voltage buildup on startup for protection of connected loads.
• Robust Construction: Designed for harsh environments with high reliability and long service life.

Technical Specifications:

• Voltage Regulation: ±1%
• Power Input: 170 – 264 VAC @ 50/60 Hz
• Voltage Sensing: 190 – 264 VAC single phase (external 2-phase sensing optional)
• Max Output: 110 VDC @ 2.7 A (continuous), 6 A for 10 seconds
• Under-Frequency Protection: With adjustable slope
• Operating Temperature: –40°C to +70°C
• Compatibility: Stamford-type brushless alternators and equivalents

Applications:

The AS440 is ideal for industrial generators, standby power systems, mobile generators, and prime power units. It’s a popular upgrade for users requiring greater control, higher regulation precision, and more robust protective features compared to basic AVRs like the SX460.