240V Switchgear NEMA 1/3R
- 240V switchgear, NEMA 1 & 3R options
- UL Listed & EUSERC Approved certified
- Genuine Siemens components, built tough
UL 891 Certified
EUSERC Approved
Siemens Approved OEM
DEI Power's 400 Amp Power Distribution Boxes include UL 891-certified switchboards, panelboards, switchgear, service entrance sections, and remote power panels built with genuine Siemens components. Designed for commercial, industrial, and utility applications, these NEMA 1/3R-rated assemblies deliver reliable, code-compliant power distribution for high-demand environments.
Talk to our product experts for custom solutions.
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For a 400-amp service, you typically need 1000 kcmil copper conductors or 1250 kcmil aluminum conductors per phase, though exact sizing depends on the installation method, conduit fill, temperature rating, and local code requirements. Always consult a licensed electrician and refer to NEC Article 310 for conductor ampacity tables. DEI Power's specialists can provide configuration guidance for your specific application.
Talk to our experts for custom solutions and tailored guidance.
400A distribution boxes deliver code-compliant, heavy-duty power management for office buildings, retail centers, and campuses.
Heavy-duty switchgear and panelboards protect large electrical loads in demanding industrial and manufacturing environments.
Remote power panels and switchgear provide structured branch circuit distribution for data center rows and colocation deployments.
EUSERC-approved service entrance switchgear and SES units support reliable utility-grade power distribution and infrastructure projects.
Talk to our experts for custom solutions and tailored guidance.
As an approved Siemens OEM, every assembly uses genuine Siemens components and meets UL 891 standards for dependable, code-compliant power distribution.
Built and assembled in our 50,000 sq. ft. Ontario, CA facility, our in-house manufacturing enables faster builds, fewer delays, and delivery in 3–5 business days.
From specification through installation, our specialists provide dedicated project support, custom configuration guidance, and 24/7 assistance for time-sensitive deployments.
Submit your project details and a DEI Power specialist will respond with pricing, configuration guidance, and lead time confirmation.
For immediate assistance, feel free to give us a direct call at (866) 773-8050. You can also send us a quick email at sales@deipower.com.
For immediate assistance, feel free to give us a direct call at (866) 773-8050. You can also send us a quick email at sales@deipower.com.