Switchgear
- UL 891 low-voltage switchboard certified
- 400A–4000A scalable amperage range
- In-house build for faster delivery schedule
UL 891 Certified
EUSERC Approved
Siemens Approved OEM
DEI Power's NEMA 3R Switchboards with Main Circuit Breaker solutions deliver UL 891-certified, weather-resistant power distribution for commercial, industrial, and utility applications. Built with genuine Siemens components, these outdoor-rated switchboards handle 400A to 4000A across multiple voltage configurations, ensuring code-compliant performance in demanding environments.
Talk to our product experts for custom solutions.
Apply Filters
Under the National Electrical Code (NEC), a switchboard is a large single panel or assembly of panels that contains switches, overcurrent devices, and buses. Switchboards are designed for controlling and distributing electrical power, typically installed where they are accessible from the front and rear. They must comply with NEC Article 408 and are commonly used in commercial and industrial facilities.
Talk to our experts for custom solutions and tailored guidance.
NEMA 3R switchboards provide reliable main circuit breaker power distribution for office campuses and retail facilities.
Heavy-duty switchboards control and protect large electrical loads in manufacturing plants and processing facilities.
UL 891-certified, EUSERC-approved switchgear built to utility specifications for substations and infrastructure projects.
High-amperage switchgear solutions supporting continuous uptime for hyperscale and enterprise data center power systems.
Talk to our experts for custom solutions and tailored guidance.
As an approved Siemens OEM, DEI Power builds every switchboard with genuine Siemens components, ensuring precision-engineered reliability and long-term serviceability.
In-house manufacturing at our 50,000 sq. ft. Ontario, CA facility means faster builds, fewer delays, and free shipping with delivery in 3–5 business days.
From custom utility specifications to post-installation assistance, our dedicated project and technical support team keeps your project on schedule and compliant.
Submit your project requirements and a DEI Power specialist will respond with configuration guidance, compliance details, and pricing within one business day.
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.