Square D D323 Fusible Safety Switch, 100A, 240V, 3-Pole, NEMA 1

The Square D D323 is a heavy-duty fusible safety switch designed for reliable power disconnection in industrial, commercial, and residential applications. This 3-pole switch is rated for 100 amps at 240 volts AC, making it suitable for motor circuits, lighting, and general electrical distribution systems where overcurrent protection is required. It features a NEMA 1 indoor enclosure, providing basic protection against contact with live parts and suitable for dry, non-hazardous environments. Key benefits include robust construction for long-term durability, visible blade disconnect for safety verification, and compatibility with Class H, K, R, or J fuses for customizable protection. Compared to non-fusible switches, it offers integrated overcurrent protection, reducing the need for separate fusing. Drawbacks may include the need for fuse replacement after faults and slightly higher maintenance compared to circuit breakers. Its compact design facilitates easy installation, and it's ideal for service entrance equipment or branch circuit isolation. Square D's reputation for quality ensures compliance with UL standards, enhancing safety and reliability over generic alternatives. This used unit shows signs of wear but remains functional for cost-effective upgrades.