Square D H321NRB - 30A, 240V, Disconnect Switch

Powerful, compact, and built for reliability, the Square D H321NRB 30A, 240V Disconnect Switch delivers clean on/off isolation and dependable overcurrent protection in demanding industrial and commercial environments. Designed to withstand tough electrical applications, this disconnect switch helps you safeguard equipment and personnel while keeping critical systems accessible for maintenance.

Key specifications

• Model: H321NRB
• Amperage: 30A
• Voltage: 240V

Ideal for motor disconnects, panelboards, and branch circuit protection where a compact, maintainable fusible switch is required, the H321NRB provides a streamlined solution for isolating circuits without sacrificing protection or serviceability. Its robust construction is intended for environments where space is limited but reliability cannot be compromised.

Where this fits your system

• Motor disconnects on small to medium industrial equipment—quickly isolate a powered motor for safe maintenance and service work.
• Panelboards where a dedicated disconnect helps meet electrical code requirements and improves fault isolation.
• Branch circuit protection for critical loads in commercial spaces, HVAC, pumps, conveyors, and other automated systems.

Why choose the Square D H321NRB

• Compact footprint designed for tight electrical rooms and crowded panels, reducing enclosure size without compromising safety.
• Clear on/off isolation paired with reliable overcurrent protection, improving maintenance workflows and reducing downtime.
• Trusted Square D build quality and a design that emphasizes maintainability, making routine inspections and servicing straightforward.

Practical tips for installation and use

• Plan mounting orientation and enclosure compatibility to ensure easy access to the disconnect handle during maintenance.
• Verify wiring clearances and conductors meet 240V branch circuit standards to maintain safe operation.
• Incorporate the disconnect switch as part of a broader safety and protection strategy for motor circuits and panelboard layouts.