Syntron Rectifier Assembly 57-957 SD-3311

The Syntron 57-957 SD-3311 is a rectifier assembly designed for use in vibratory feeder systems and material handling equipment. Manufactured by Syntron Material Handling (now part of Kadant), this component converts AC power to DC for electromagnetic vibrators, ensuring smooth and controlled operation in industrial applications such as bulk material feeding, screening, and conveying. Key features include a robust selenium rectifier stack with integrated heat sink fins for efficient thermal dissipation, allowing reliable performance in demanding environments. Advantages over similar products include high durability, low maintenance, and compatibility with Syntron's legacy vibratory systems, offering better vibration control and energy efficiency compared to modern solid-state alternatives, though it may lack the precision of newer digital controls. Drawbacks include potential obsolescence due to selenium technology, which is less common today, and higher heat generation requiring adequate ventilation. Ideal for food processing, mining, and packaging industries, this unit supports variable speed control and is built for long-term industrial use. Based on image analysis, this appears to be new old stock with minor surface oxidation on mounting hardware, but no signs of wear or damage.