Siemens Switchboards — Emergency Build & Same-Day Stock

When a Siemens switchboard fails or a project deadline shifts, you do not have 20 weeks to wait on a factory order. We stock and build Siemens low voltage switchboards from 1600A to 4000A and ship nationwide, often inside 24 to 48 hours. Whether you are replacing a damaged service entrance, expanding a commercial facility, or specifying gear for a new industrial install, our team can match the original Siemens configuration and get it on the truck while other suppliers are still confirming material availability.

Verified Breakers carries Siemens SB1, SB2 and SB3 front-connected switchboards alongside reconditioned and surplus units. Every assembly is tested, labeled, and built to your single-line drawing. Send us your specs and we will quote within hours.

The Siemens Switchboard Range We Stock

Siemens manufactures one of the deepest low voltage switchboard lines in North America, and we hold inventory across the most-requested variants. Our active stock covers front-connected designs rated up to 4000A on the main bus and custom builds up to 6000A through our fabrication partners.

Configurations we routinely supply:

• SB1 switchboards for limited-space service entrance applications up to 2000A
• SB2 switchboards with added capacity up to 4000A, supporting insulated case and molded case breakers
• SB3 switchboards custom-configured for high-fault industrial sites up to 6000A
• Group-mounted distribution sections with MCCBs from 100A through 1200A
• Service entrance sections with main breakers, ground fault protection and metering compartments
• NEMA 1 indoor and NEMA 3R outdoor enclosures, including seismically qualified options

Each Siemens switchboard we ship is built to UL 891 and NEMA PB-2 standards. Bus bracing is available up to 200kAIC for data center and industrial environments where fault current is non-negotiable.

Amp Ratings: 1600A Through 4000A Builds

Our highest-volume Siemens switchboard inventory sits in the 1600A to 4000A range. These are the assemblies most facilities specify for main service, sub-distribution and large mechanical loads. We carry the breakers, bus, and structural sections to build any standard amp rating from stock and have shipped emergency replacements for every size in this range.

1600A and 2000A Siemens Switchboards

The 1600A and 2000A class covers the bulk of commercial service entrance work. Typical builds are 480Y/277V, 3-phase 4-wire, with a main disconnect or main breaker section and three to five distribution sections. We supply these with fused disconnects, bolted-pressure switches, or WL insulated case breakers depending on your interrupting requirement. Standard interrupting ratings of 65kAIC and 100kAIC are kept on the shelf.

2500A Siemens Switchboards

2500A switchboards bridge commercial and light industrial demand. Common use cases include healthcare campuses, multi-tenant office buildings, and mid-size manufacturing plants. We build these in SB2 frames with mains-only or main-and-distribution configurations, with the option to add metering, surge protection, and ground fault relay packages.

3000A and 4000A Siemens Switchboards

The 3000A and 4000A range is where data centers, hospitals, and heavy industrial sites typically specify. These assemblies use Siemens WL insulated case circuit breakers or RL-frame power breakers as the main, with extra-depth distribution sections to accommodate higher-capacity bussing. We stock the structural sections, copper bus, and WL trip units required to build at this rating without waiting on factory shipments.

Voltage and Configuration Options

Most Siemens switchboards we sell are rated 480Y/277V or 208Y/120V, 3-phase 4-wire. We also build 240V delta and 600V Canadian-spec switchboards when projects call for them. Configurations are flexible: main breaker, main lug only (MLO), service entrance rated, or sub-distribution. Tell us what the upstream feeder looks like and we will configure the switchboard to match.

Common configuration combinations we build to order:

• Service entrance with utility metering compartment and main breaker
• Main lug only distribution for downstream feeders
• Double-ended switchboards with tie breaker for redundant supply
• Integrated ground fault protection with 1200A and larger mains
• Surge protection device sections for sensitive electronic loads
• Future-space sections sized for known expansion

Main and Distribution Section Specifications

Every Siemens switchboard we ship includes documentation that matches what your electrical contractor and AHJ expect to see. That covers single-line diagrams, breaker schedules, nameplate data, and test reports for the as-built assembly. We label every section, mark breaker positions, and confirm phase rotation before the unit leaves our facility.

On the breaker side, we hold inventory of Siemens FD, HFD, JD, HJD, LD, HLD, MD, and HMD frames for distribution sections, plus WL and RL power breakers for mains. If you need a specific trip unit, communications module, or shunt trip accessory, name it on the quote and we will confirm availability before pricing.

Why Buy Siemens Switchboards From Verified Breakers

Our entire business is built around one number: 24 to 48 hour turnaround when manufacturer lead times are 20+ weeks. That is the gap we close. When the factory quotes you a delivery date in Q4 and your project needs gear by Friday, we are the supplier you call.

What you get when you order a Siemens switchboard from us:

• In-stock structural sections, bus, and breakers across the 1600A to 4000A range
• Custom builds assembled, tested and shipped from our facility, not drop-shipped from elsewhere
• Nationwide shipping with same-day dispatch on stock units
• Surplus and reconditioned options when budget matters more than new-build lead time
• Full documentation package including single-line, breaker schedule, and test reports
• Direct phone support from people who have built and shipped this gear, not a call center

We sell to electrical contractors, facilities managers, data center operators, and industrial end users across the United States. Emergency procurement is what we do every week.

Request a Quote on Your Siemens Switchboard

Send us your single-line drawing, breaker schedule, or original Siemens part number and we will quote your switchboard the same day. If you need an emergency replacement, mention the deadline up front and we will confirm whether we can ship from stock or whether we need to build it. Either way, you will have a real answer within hours, not weeks.

Request a quote on your Siemens switchboard build, send your specs to our team, or call us directly to discuss your project. We will tell you exactly what we have on the shelf, what we can build, and when it can be on your site.