Eaton R9E4400U - 400A, 4-Pole, Disconnect Switch

The Eaton R9E4400U is a high-performance disconnect switch engineered for industrial and commercial environments that demand safe, reliable electrical isolation. With a 400‑ampere rating across four poles, this device delivers dependable disconnection under load while supporting rigorous lockout/tagout procedures. Built for long-term durability, it helps facilities maintain safety and uptime during maintenance and outages.

Why choose the Eaton R9E4400U

• Four-pole isolation provides comprehensive clearance for all conductors in typical electrical systems, reducing the risk of partial energization during service.
• 400A capacity handles substantial loads common in industrial feeders and equipment controls without compromising reliability.
• Lockout/Tagout compatibility supports standard safety practices, helping your team secure energy sources during maintenance and inspections.
• Durable, dependable operation built to withstand demanding environments and repetitive cycling, promoting long service life.
• Versatile industrial/classroom-ready safety suitable for a range of applications from manufacturing lines to commercial electrical rooms.

Real-world use cases

Use the Eaton R9E4400U to safely isolate heavy equipment before service, perform planned shutdowns, or establish a controlled energy isolation point during maintenance. Its robust construction and clear, decisive disconnection help technicians work confidently, knowing the system is fully de‑energized.

What problems it solves

In environments where safety and uptime are critical, partial energization and ambiguous off states can lead to costly downtime or safety incidents. The R9E4400U provides complete, compliant isolation that supports effective lockout/tagout programs, reduces the risk of accidental re-energization, and minimizes maintenance delays.

Ideal for

• Maintenance teams in manufacturing facilities and logistics centers
• Electrical contractors installing or servicing motor feeders and power distribution
• Facilities managers overseeing commercial electrical rooms and service panels

Specifications at a glance

• Amperage Rating: 400A
• Number of Poles: 4-Pole
• Product Type: Disconnect Switch
• Brand: Eaton
• Model: R9E4400U

Choosing this over simpler alternatives

Compared with smaller or single-pole disconnects, the R9E4400U delivers complete isolation for multi-conductor systems, enhancing safety during maintenance and aligning with stringent OSHA-style safety practices. Its combination of high current capacity, four-pole design, and LO/TO alignment makes it a smarter, longer-lasting choice for demanding environments.