Square D H321NRB - 30A, 3-Pole, Heavy-Duty, Fusible, Safety Switch

Square D H321NRB is a 30A, 3-Pole, heavy-duty fusible safety switch engineered for reliable on/off isolation and overcurrent protection in demanding industrial and commercial environments.

This compact, maintainable fusible switch delivers confident power control where space is at a premium, making it an ideal choice for motor disconnects, panelboards, and branch circuit protection. By combining switching and fuse protection in a single rugged enclosure, it helps crews quickly isolate circuits for safe maintenance while providing dependable fault interruption when protection is needed.

Key benefits

• Three-pole design for 3-phase loads: Balanced switching ensures smooth operation of motors and equipment across all three phases.
• Fusible protection: Replaceable fuse elements provide fast, targeted interruption to safeguard wiring and connected machinery.
• Heavy-duty construction: Built to withstand demanding industrial and commercial environments, delivering long service life in harsh operating conditions.
• Compact footprint: Designed for panelboards and motor control centers where space efficiency matters without sacrificing protection.
• Maintainnable by design: Optimized for straightforward maintenance and fuse replacements to minimize downtime.

Ideal applications and use cases

• Motor disconnects in manufacturing lines, pumps, conveyors, and HVAC equipment where reliable isolation is essential.
• Panelboard protection where integrated switching and fuse protection reduce the need for separate components.
• Branch circuit protection in spaces with limited enclosure footprint, delivering compliant isolation for servicing and emergency stops.

Specifications at a glance

• Model: H321NRB
• Amperage: 30A
• Poles: 3-Pole
• Duty: Heavy
• Fusible: Yes