Ferraz Shawmut Amp-Trap A480R4R-1 Current Limiting Fuse

The Ferraz Shawmut Amp-Trap A480R4R-1 is a high-performance, R-rated current limiting fuse designed for medium voltage applications, particularly in motor protection circuits. This fuse operates at a maximum voltage of 5.08kV (commonly referred to as 4.8kV class) and is engineered to provide reliable short-circuit protection with minimal let-through current, reducing stress on equipment and enhancing system safety. Key features include its bolt-mount design for easy installation, high interrupting capacity up to 63kA symmetrical, and compliance with ANSI C37.46 standards for power fuses. It excels in industrial settings such as manufacturing plants, utilities, and motor control centers, where it safeguards transformers, feeders, and motors from overloads and faults. Advantages over similar products include superior arc-quenching technology for faster clearing times, robust construction with silver-plated elements for longevity, and a compact form factor that fits standard fuse clips. However, it may require specific mounting hardware and is not suitable for low-voltage applications. Drawbacks include higher cost compared to general-purpose fuses and the need for periodic inspection in high-vibration environments. Overall, this fuse offers excellent reliability and protection, making it a preferred choice for critical electrical systems.