SX460 AVR – Automatic Voltage Regulator

SX460 Voltage Regulator – Compact AVR for Stamford-Type Brushless Alternators

The SX460 is a compact, self-excited automatic voltage regulator (AVR) widely used in brushless AC alternators. Designed for Stamford-type generators, the SX460 offers reliable voltage control, ease of integration, and robust performance for a wide range of power generation applications.

It provides precise voltage regulation under varying load conditions and features built-in protection and adjustments, making it a dependable choice for standby and prime power systems.

Key Features:

• Single Phase Sensing: Voltage sensing from one phase for simplified installation and reduced wiring complexity.
• Self-Excited Design: Draws power directly from the generator terminals—no external power supply needed.
• Compact Form Factor: Easily fits within most generator control enclosures or behind control panels.
• Adjustable Voltage & Stability: Fine-tune output voltage and response speed with accessible potentiometers.
• Built-in Over-Excitation Protection: Protects the exciter and stator winding from excessive field current.
• Low Frequency Protection: Reduces voltage proportionally under low-speed conditions to prevent equipment damage.

Technical Specifications:

• Voltage Regulation: ±1%
• Sensing Input: 190 – 264 VAC single phase
• Power Input: 170 – 250 VAC at 50/60 Hz
• Max Output: 90 VDC at 207 Ω (max 3.0 A continuous, 7.5 A for 10 seconds)
• Frequency Compensation: Undervoltage protection with selectable knee point
• Operating Temperature: –40°C to +70°C
• Typical Use: Stamford-type or equivalent brushless alternators

Applications:

The SX460 is commonly used in small to mid-sized diesel or gas generator sets, especially for residential backup power, commercial standby systems, portable power units, and light industrial applications. Its compact design and proven reliability make it a popular choice for OEMs and replacement needs alike.