How to Choose a Control Panel Manufacturer in the USA

Disclosure: This guide is published by Cloom Tech. Cloom Tech is not one of the control panel manufacturers compared below — it is a wire harness and cable assembly manufacturer whose work often ends up inside a control panel enclosure — and the section about Cloom Tech near the end is a disclosed, sponsored element.

A control panel’s reliability depends on more than the enclosure — it depends on who built it, how they document the build, and whether the internal wiring was done to a verifiable standard. This guide does not rank suppliers. It sets out what to check before you shortlist a US control panel manufacturer, gives the same facts for each company so you can compare them yourself, and separately covers what to check on the wire-harness side of a panel build.

What should I check before shortlisting a control panel manufacturer?

Use these criteria for every company in this guide:

• Compliance credentials: which UL standard(s) the company says its panels are built to (UL 508A is the common baseline; UL 698A/UL 1203 apply to hazardous locations), and whether it also publishes an ISO 9001 or similar quality-system certification.
• Where the panel is actually built: the company’s own stated facility address(es) — some suppliers describe a national footprint but build out of a single plant.
• Scale and facility size: headcount, facility square footage, or years in business, where the company itself publishes a figure.
• Documentation and testing: whether the company describes its own testing process (e.g., functional testing before shipment) and build-record practices, not just a general claim of “quality.”
• Scope beyond the panel itself: whether the company also offers PLC/HMI programming, SCADA integration, switchgear, or field service, versus panel assembly only.

Figures below come from each company’s own website unless marked otherwise. Anything a company did not publish is left out, not estimated.

Which control panel manufacturers serve US buyers?

The six companies are listed in alphabetical order. Order does not indicate quality or preference.

Control Panel USA (Control Panels USA Inc.)

• Founded: not stated on the company’s own site.
• Locations: 4811 North IH35, Georgetown, Texas. No other facility is listed on the company’s own site.
• Certifications (company-stated): the company describes itself as a “UL508A, UL698A, & UL698B manufacturer of Control Panels and Relay Rack assemblies” and displays a UL mark. No ISO or other certification is published.
• Focus: custom control panels and relay rack assemblies for OEM, contractor, and end-user customers, across both large and small production runs. It also lists turnkey Instrumentation & Controls services — design, assembly, SCADA/PLC integration, and field services — and names water & wastewater, electric-utility relay racks, oil & gas, food & beverage, semiconductor, pharmaceutical, corrections, and commercial lighting/HVAC among the industries it serves.

Trade-offs:

• Strength: UL 508A, UL 698A and UL 698B scope in one shop covers both general industrial and hazardous-location panel work.
• Limit: a single Georgetown, Texas facility, so confirm lead time for your volume. Its own site does not publish an ISO certification, a founding year, or Professional Engineering licensing for its staff — ask directly if any of those matter to your project.

Design Ready Controls

• Founded: not stated; its current headquarters and production facility in Brooklyn Park, Minnesota was built in 2015, consolidating three prior sites.
• Locations: 9325 Winnetka Avenue N, Brooklyn Park, Minnesota (headquarters and main production). The company’s own site also references a Richmond-based facility (“Richmond Suite C”) without stating which state; this guide does not assume Oklahoma or Virginia, which appear in some third-party directory listings but were not confirmed on the company’s own site.
• Certifications (company-stated): “all our facilities are ISO 9001:2015 registered,” with the Richmond site noted as pending registration. The company says it manages UL compliance responsibility and completes quarterly audits for its customers, rather than stating that it holds its own UL certificate.
• Focus: OEM, custom, low-voltage and medium-voltage control panels and enclosed drive packages, built using its own proprietary APE® (automated quoting and schematic/BOM generation) and AME® (manufacturing) systems, Komax and Schleuniger wire-processing equipment, and integrated CNC equipment. It serves HVAC/building technology, water treatment and pumping, oil and gas, and alternative-energy OEM programs, and says it has served “more than 20 industries” overall.

Trade-offs:

• Strength: the APE®/AME® systems automate quoting, schematic and bill-of-materials generation, and give customers a live portal into records for their installed panels.
• Limit: a highly systemized, repeatable-build model that the company’s own site frames around OEM production programs, so a one-off or highly custom build may be a closer fit with a less automated shop. It manages UL compliance on customers’ behalf rather than stating a UL certificate of its own.

Enercon Power Solutions (Enercon Engineering, LLC)

• Founded: not stated as an exact year; the company’s own site describes “over four decades” of operation, growing from a 5,000 sq ft garage. Enercon was acquired by Generac in April 2026.
• Locations: 201 Altorfer Ln., East Peoria, Illinois — a 160,000 sq ft total facility, including a 50,000 sq ft electrical assembly area.
• Certifications (company-stated): UL 508A and UL 698A for industrial control panels; UL 891 and UL 1558 for switchgear and switchboards. No ISO certification is published on its site.
• Focus: industrial control panels grouped with low- and medium-voltage switchgear, generator and load-bank docking stations, power packaging (including generator enclosures), and in-house PLC/HMI programming and system integration, serving data center, hospital, utility, and manufacturing customers among others.

Trade-offs:

• Strength: pairs UL 508A/698A panel work with in-house switchgear and system-integration capability under one roof, plus a 2026 acquisition by Generac that could add resources.
• Limit: its broader switchgear and power-packaging scope means a buyer who wants a narrowly focused panel-only specialist should confirm how much of the quoted scope is actually needed. No ISO certification is published on its own site.

Panelmatic

• Founded: not stated as an exact year; the company’s own site cites “over 60 years of experience.”
• Locations: Houston and Conroe, Texas; Brookfield and Youngstown, Ohio; and Vancouver (Burnaby), British Columbia.
• Certifications (company-stated): UL 1558 (medium-voltage switchgear) and UL 891 (switchboards) are listed for the Houston, Texas and Burnaby, BC facilities. No ISO certification is published.
• Focus: control panels, relay protection panels, power distribution equipment, engineered enclosures, and medium-voltage switchgear, for data center, utility, industrial, and renewable-energy customers, with fabrication, assembly and testing performed in-house across its facilities.

Trade-offs:

• Strength: a multi-site footprint across three states/provinces with in-house fabrication, wiring and testing, suited to larger or multi-location programs.
• Limit: the facility count and scale that suit large programs may be more than a buyer with a small, single-panel job needs. No ISO certification is published on the company’s own site.

Simcona

• Founded: not stated as an exact year; the company’s own site cites “60+ years” of operation. Simcona was acquired by wire and cable distributor IEWC in a deal announced 2026-02-03; its control panel operations now sit inside IEWC’s Controls business.
• Locations: Rochester, New York — corporate headquarters at 275 Mt Read Blvd, with a separate control panel manufacturing facility at 525 Mile Crossing Blvd.
• Certifications (company-stated): UL 508A and UL 698/698A (its certifications page and a related graphic label this standard inconsistently as “UL 698” and “UL-698A”); ISO 9001:2015. Its control-panel assembly page also lists REACH, RoHS and CSA compliance.
• Focus: build-to-print custom industrial control panels, translating customer drawings into work instructions with digital, photo-and-drawing-supported build documentation; the company states 100% functional testing (continuity, insulation, and safety checks) before shipment, a supplier network supported by AI-driven sourcing tools, and more than 10,000 panels built and shipped to date (including 5,000+ for one named material-handling OEM case study).

Trade-offs:

• Strength: a stated 100%-functional-test regimen plus a published track record of 10,000+ panels built and shipped.
• Limit: ownership changed hands in a February 2026 acquisition by IEWC, so confirm directly whether production location, lead times, or support have changed since.

South Coast Controls

• Founded: 1984; family-owned since founding, per the company’s own site, with 168,000+ projects delivered (company-stated).
• Locations: a 38,000 sq ft manufacturing facility in Anaheim, California.
• Certifications (company-stated): UL 508A, UL 698A, UL 1203, ISO 9001:2015, and CSA.
• Focus: custom control panels including hazardous-location (explosion-proof and intrinsically safe) and purge panels, PLC/HMI programming (Allen-Bradley, Siemens, Schneider Electric, Modicon), SCADA integration (Ignition, Wonderware, FactoryTalk View SE, iFIX), robot integration, legacy panel upgrades, and a Steinhauer CNC modification center for enclosure cutting, drilling and tapping.

Trade-offs:

• Strength: UL 1203 hazardous-location certification alongside UL 508A/698A, plus a four-decade, family-owned track record.
• Limit: its hazardous-location specialization may be more than a simple, high-volume general-purpose panel job needs, and may cost more than a generalist shop for that kind of work. Its own site does not publish a dollar figure for stocked components or an on-time-delivery percentage — ask directly for current figures.

How do I choose between these control panel manufacturers?

1. Match the certification to the job. UL 508A covers general industrial control panels; UL 698A and UL 1203 apply specifically to hazardous-location work. Ask for the certificate that actually covers your installation location.
2. Confirm the build location. A national-sounding brand can still build out of one plant — ask for the address of the facility that will build your panel.
3. Ask how testing is documented. “Tested” and “100% functional tested with calibrated, documented equipment” are different claims — ask which one applies to your order.
4. Check scope fit. A full-service shop with switchgear, SCADA, and field service may be more (and cost more) than a straightforward panel-only job needs, and vice versa.
5. Ask about recent ownership changes. Two companies in this guide (Enercon, Simcona) have changed ownership within the last several months — confirm whether that has affected lead times, staff, or location.

What about the wire harnesses and cable assemblies inside the panel?

A control panel’s enclosure and internal wiring are usually sourced separately — the panel builder assembles the enclosure, but the harnesses and cable assemblies that connect its components are often built by a dedicated wire harness manufacturer, either in-house or through a separate supplier. Buyers assembling their own sourcing chain should apply the same checks (certifications, testing, documented build records) to that supplier as to the panel builder itself.

Sponsored (Cloom Tech): Cloom Tech is one example of a supplier in that category, and the publisher of this guide.

• Founded: “Since 2017” (cloomtech.com homepage statistics block, labeled “Industry Experience”).
• Locations: Shijiazhuang, Hebei, China (headquarters and plant, per cloomtech.com) — a “5000 sqm” factory per the homepage statistics block (“Factory Space”); Cavite, Philippines (plant, near Manila, per cloomtech.com); Medley, Florida, USA (office, per cloomtech.com).
• Certifications (company-stated): ISO 9001; IATF 16949 (named on cloomtech.com’s own pages, though no validity date is published on any live page); ISO 13485 (medical wire-harness production, named on cloomtech.com/about-us/); RoHS and REACH compliance (named on cloomtech.com).
• Focus: custom wire harnesses and cable assemblies built to customer specifications, for OEM programs including panel-internal wiring, with “1,000+” cumulative clients stated since 2017 (cloomtech.com homepage statistics block). Cloom Tech does not sell connectors separately, does not sell standard or pre-built harnesses, and does not offer panel or enclosure design services — it manufactures to customer specifications and offers consultation/recommendations.

Trade-offs:

• Strength: a named ISO 13485 certification for medical-grade wire-harness production, alongside ISO 9001 and IATF 16949.
• Limit: Cloom Tech builds in China and the Philippines and has a US office rather than US manufacturing, so confirm what that means for your lead time and landed cost; it does not build the panel enclosure itself, only the wire harnesses and cable assemblies that go inside one.

Ready to talk about your panel’s internal wiring?

Sponsored (Cloom Tech): If you want Cloom Tech to quote the wire harnesses or cable assemblies for your control panel program, send your drawing, expected volumes, and target certifications. Request a quote at the Cloom Tech contact page.