4000 amp NEMA 3R switchgear is built for large-scale outdoor power distribution in demanding commercial, industrial, utility, and infrastructure electrical systems. Manufactured in the USA and supported by high-demand inventory, 4–6 week lead times, and fulfillment from our 50,000 sq. ft. warehouse, we help keep critical projects moving.
4000 amp NEMA 3R switchgear manufactured in the USA for reliable high-capacity outdoor power distribution. With high-demand inventory, 4–6 week lead times, and fulfillment from our 50,000 sq. ft. warehouse, we help keep projects moving.
Every 4000 amp NEMA 3R switchgear system we manufacture is purpose-built to meet your project’s exact specifications. From layout and voltage to breaker configuration, each unit is engineered for seamless integration into your existing power infrastructure while maintaining compliance with UL 891, NEC, and CSA standards.
Built for demanding environments
Designed for heavy-duty performance, our systems support large-scale industrial and commercial electrical loads without compromise. NEMA 3R-rated enclosures shield components from rain, snow, dust, and corrosive elements—ensuring uninterrupted operation in outdoor and challenging installation sites.
Precision fit and seamless integration
Our engineering process ensures every switchgear system matches your site requirements precisely, reducing installation time and minimizing costly modifications. CAD modeling, copper bus fabrication, and in-house CNC machining guarantee consistent quality and reliable, code-compliant operation from day one.
NEMA 3R enclosures safeguard components from rain, sleet, and snow, making them ideal for exposed or partially sheltered installations. Combined with the robust 4000 AMP capacity, these systems deliver dependable performance for the most demanding high-load applications.
NEMA 3R enclosures are best suited for:
Utility yards and substations
Exterior plant distribution points
Rooftop or pad-mounted installations
Outdoor event or temporary power
Engineered for sustained high-capacity performance in outdoor settings, our 4000 amp NEMA 3R systems deliver efficiency, durability, and reduced maintenance requirements—helping your operation run without costly interruptions.
Every enclosure and busbar is manufactured to exact specifications
NEMA 3R construction shields components from the elements
Designed for easy inspection and servicing to reduce operating costs.
UL 891, NEC, and CSA standards are integrated into every design.
We engineer and manufacture every system in the USA for performance, safety, and faster lead times. With in-house production, we control each stage of the process to deliver the exact gear you ordered, on schedule, and built for long-term service.
“Working with DEI Power has been a game-changer for our operations. Their custom panelboards are expertly built, and the in-house bus bar manufacturing gives them a level of precision and flexibility that’s hard to find…”
“The custom panelboard was solid, cleanly wired, and built exactly to spec. It dropped right into place without a hitch. You can tell they take pride in their work. We’ll definitely be coming back for future projects.”
“We’ve worked with a few manufacturers before, but no one does bus bars like DEI Power. The bends were precise, the plating was clean, and everything lined up exactly the way we needed.”
Our NEMA 3R switchgear are purpose-built for operations where capacity, uptime, and compliance are non-negotiable. Each system is tailored to its environment, delivering reliable, outdoor-rated performance for industries that can’t afford power interruptions.
Switchgear for reliable power in high-uptime and critical environments
Switchgear built for heavy loads and industrial durability
Scalable switchgear for flexible power distribution layouts
Code-compliant switchgear for safe power distribution
Our NEMA 3R switchgear are purpose-built for operations where capacity, uptime, and compliance are non-negotiable. Each system is tailored to its environment, delivering reliable, outdoor-rated performance for industries that can’t afford power interruptions.
Your electrical infrastructure needs switchgear that can stand up to the harshest conditions. Our 4000 amp NEMA 3R solutions are built for unmatched outdoor performance, rapid deployment, and full compliance—without compromise on quality or safety.
Emergency and overnight shipping
We deliver California-manufactured switchgear with the quickest turnaround times in the industry. By keeping production local, we eliminate delays and ensure faster delivery statewide. Our streamlined process guarantees UL 891 certified low voltage switchgear arrives on schedule, ready for installation.
Whether you’re looking for backup power systems, industrial energy storage, or sustainable energy consulting, we’re ready to support your project needs. Be as specific as possible so we can connect you with the right expert.
+1 (866) 773-8050
4725 Troy Ct. Jurupa Valley, CA 92509
sales@deipower.com
© 2026 DEI Power Solutions, Inc. All Rights Reserved.
Privacy Policy | Terms & Conditions
The Importance of UL 891 Switchgear in Modern Facilities
The Future of Switchgear in Data Centers
Office Location
4725 Troy Ct.
Jurupa Valley, CA 92509
Contact Info
Phone: +1 (866) 773-8050
Email: sales@deipower.com
The Future of Switchgear in Data Centers
The Importance of UL 891 Switchgear in Modern Facilities
What Is a Custom Panelboard—and Do You Need One?
5 Signs Your Facility Needs a Panelboard Upgrade
