Eaton H421K - 30A, 240V, 4-Pole, Safety Switch, NEMA 1

The Eaton H421K is built for reliable on/off isolation and dependable overcurrent protection in demanding industrial and commercial environments. With a 30A, 240V, 4-pole configuration and a NEMA 1-rated enclosure, this safety switch delivers full conductor isolation in a compact, maintainable fusible switch design. It’s purpose-built for motor disconnects, panelboards, and branch circuit protection where space is at a premium and serviceability matters.

Key specifications

• Model: H421K
• Amperage: 30 A
• Voltage: 240V
• Poles: 4-Pole
• NEMA Rating: NEMA 1

What sets the H421K apart

Designed for indoor use where reliability is non-negotiable, the H421K combines a rugged mechanical build with a compact footprint. Its 4-pole arrangement ensures complete isolation of all power conductors during maintenance, reducing downtime and simplifying safe service workflows. The fusible switch configuration adds a straightforward path for overcurrent protection right at the point of control, enabling streamlined electrical protection for motors and regulated circuits without sacrificing accessibility.

Ideal use cases

• Motor disconnects in small to mid-size machines or conveyors
• Inline protection for panelboards housing critical equipment
• Branch circuit protection in compact electrical rooms or utility spaces
• Maintenance shutoffs where quick disconnection minimizes downtime

Installation and practical considerations

When wiring the H421K, plan for a four-wire connection to ensure true full-isolation across all poles. The 240V system aligns with common motor and control circuits, while the compact form factor eases installation in crowded enclosures. Because it’s NEMA 1, it’s intended for indoor, dry environments with standard mounting conventions. Ensure the switch is wired in accordance with local electrical codes and the system’s protection coordination strategy.

Why choose this Eaton safety switch

If you need a dependable, field-serviceable disconnect that protects both people and equipment, the H421K delivers. Its combination of 4-pole isolation, 30A rating, 240V operation, and NEMA 1 protection makes it a practical choice for facilities aiming to minimize downtime, simplify maintenance, and maintain clear, safe control of powered equipment. In environments where space is tight and reliability is critical, this Eaton safety switch provides a focused, purpose-built solution.