National Breaker Services
National Breaker Services is a privately held U.S. manufacturer of Citadel® medium-voltage vacuum circuit breakers and custom switchgear, serving utilities, industrial plants, and critical infrastructure with engineered roll-in replacements for obsolete OEM breakers.
- Company typePrivate
- Founded1999
- HeadquartersMiddlebury, United States
- Headcount11–50
- GTM typeB2B
- OfferingHardware or Manufacturing
What National Breaker Services does
National Breaker Services L.L.C. (NBS) is a privately held U.S. manufacturer founded in 1999 and headquartered in Middlebury, Connecticut. The company specializes in medium-voltage vacuum circuit breakers and custom switchgear, with its flagship Citadel® 2.0 product line engineered as direct roll-in replacements for legacy breakers originally manufactured by GE, Westinghouse, Siemens Allis, Allis Chalmers, ITE, Federal Pacific, and McGraw. Voltage coverage spans 4,160V to 38kV, with current ratings up to 5,000 amps at 15kV and 3,000 amps at 38kV, all self-cooled. The Citadel platform is complemented by OUTLOOK Reclosers for distribution automation, TPPU transformer primary protection units, Citadel Remote Racking systems for arc-flash safety, and a range of custom walk-in, outdoor, and free-standing switchgear configurations rated to 38kV.
The underlying technology is built around vacuum interruption architecture with IEEE/ANSI standards compliance and UL 891 certification. NBS's core value proposition is life-extension of aging switchgear infrastructure: rather than forcing customers to replace entire switchgear lineups when a single obsolete breaker fails, the Citadel breaker drops into the existing cubicle footprint, eliminating costly downtime and capital outlays. The company's competitive position rests on proprietary Citadel designs, registered trademarks (Citadel, American Rugged, "Switchgear Like it Used to Be"), and patents covering the replacement architecture.
Commercially, NBS operates a direct factory-sales model with no intermediary distributors. Sales occur through an 800-number, website contact form, and engineer-led quoting for custom configurations. Revenue streams include one-time hardware sales of Citadel breakers and custom switchgear, plus professional services revenue from Match & Line measurement, fabrication, installation, startup, training, and retrofill projects. The company serves three primary verticals — power generation utilities, industrial facilities (manufacturing, refining, mining), and critical infrastructure (water/wastewater, hospitals, data centers) — exclusively within the U.S. market. NBS is bootstrapped with no external institutional investment, parent company, or publicly disclosed management team.
National Breaker Services firmographics
Firmographics- Name
- National Breaker Services
- Legal name
- National Breaker Services L.L.C.
- Website
- https://nationalbreakerservices.com
- Company type
- Private
- Founded year
- 1999
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- National Breaker Services is a privately held U.S. manufacturer of Citadel® medium-voltage vacuum circuit breakers and custom switchgear, serving utilities, industrial plants, and critical infrastructure with engineered roll-in replacements for obsolete OEM breakers.
- Ownership category
- akta.pro rank
National Breaker Services industry classification
Industry- Product category
- Medium Voltage Switchgear
- NAICS
- Switchgear and Switchboard Apparatus Manufacturing (335313), Power, Distribution, and Specialty Transformer Manufacturing (335311)
- SIC
- Switchgear & Switchboard Apparatus (3613), Power, Distribution & Specialty Transformers (3612)
- akta.pro primary industry
- Medium-Voltage Distribution Components (MV breakers, disconnects, reclosers, MV terminations & joints) (IMAGAEAL)
- akta.pro secondary industries
- Circuit Breakers, Disconnectors, Earthing Switches & Switchgear Components (EUADACAH), Testing, Commissioning, Maintenance & Retrofit/Modernization (Substations/Switchgear) (EUADACAL), Switchgear, Breaker & Buswork Retrofit Services (AIS/GIS) (EUAEALAF), Transformers (Power, Distribution, Instrument, Specialty) (IMAGAAAA)
Keywords
Where National Breaker Services is headquartered
LocationHeadquarters
- HQ city
- Middlebury
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
National Breaker Services business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Supply Chain, Operations, Personnel, Technology or R&D, Marketing or Sales
Revenue model
- Circuit Breaker Sales: Sale of new Citadel brand vacuum circuit breakers, including roll-in replacement breakers for 5kV, 15kV, and 38kV applications. Products include Citadel 2.0 series breakers compatible with GE, Westinghouse, Siemens Allis, and other legacy brands.
- Custom Switchgear: Engineered-to-order switchgear including indoor, outdoor, walk-in, and free-standing configurations. Dog house switchgear for 15kV to 40.5kV applications.
- Engineering Services: Turnkey installation services including Match & Line precision measurement, fabrication, installation, startup, and training services.
- Switchgear Retrofitting: Retrofill services to upgrade existing switchgear with modern Citadel breakers, extending the life of installed infrastructure.
Go-to-market motion1 record
Distribution channels1 record
Marketing channels3 records
National Breaker Services product offering
Product offeringCore offering
National Breaker Services designs, manufactures, and installs the Citadel line of medium-voltage vacuum circuit breakers (4,160V to 38kV) as direct roll-in replacements for obsolete GE, Westinghouse, Siemens Allis, Allis Chalmers, ITE, McGraw, and Federal Pacific breakers. The company also supplies custom engineered switchgear (indoor, outdoor, walk-in, and free-standing "Dog House" configurations up to 38kV/4000A/44kA), Transformer Primary Protection Units (TPPU), OUTLOOK Reclosers, and turnkey engineering/fabrication/installation services.
Product overview
National Breaker Services is a manufacturer of medium and high-voltage electrical distribution equipment. Their core product is the Citadel® 2.0 vacuum breaker line—a family of roll-in replacement circuit breakers designed to replace aging equipment from multiple original manufacturers including GE, Westinghouse, Siemens Allis, McGraw, Federal Pacific, ITE, and Allis Chalmers. The Citadel product family spans voltage classes from 5kV to 38kV with current ratings up to 5000A and interrupt ratings to 63kA. Beyond breakers, NBS offers complementary switchgear products (indoor, outdoor, walk-in configurations), OUTLOOK Reclosers, TPPU (Transformer Primary Protection Units), and related services including Match & Line fabrication/installation, retrofills, and engineering services. The company also provides the Citadel™ Remote Racking system as an accessory for safe remote operation.
Differentiator
Problem solved
Functional benefit
Brands
- Citadel: The Citadel™ is the company's flagship product line of vacuum circuit breakers, including Citadel 2.0 models for various voltage applications (5kV, 15kV, 38kV) and amperage ratings. Marketed as American Rugged® and Utility Grade Only.
- Citadel Remote Racking
- OUTLOOK Reclosers
- TPPU
- NBS/Crown-Sulator
Products and services
- Citadel 2.0 Vacuum Circuit Breaker
Companies that use National Breaker Services
Customer profileNamed customers1 record
Segments3 records
Ideal customer profiles3 records
National Breaker Services technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature5 records
National Breaker Services partnerships and signals
Strategic signalScale indicators4 records
Recent moves6 records
Expansion highlights5 records
National Breaker Services competitors and assessment
Company assessmentBroad incumbents
- Eaton: Eaton is a major diversified power management manufacturer producing medium-voltage switchgear, breakers, and retrofill/replacement solutions across voltages. Competes with NBS across both full switchgear lineups and replacement breakers, with much broader portfolio and global reach.
- ABB: ABB manufactures medium- and high-voltage circuit breakers, switchgear, and modular substations for utility and industrial customers globally. NBS competes in the same voltage classes with narrower niche focus on legacy replacements.
- GE Vernova: GE Vernova (successor to GE Industrial) produces medium- and high-voltage switchgear, generator circuit breakers, and grid equipment. NBS's Citadel GE-Magneblast replacement breakers directly target legacy GE installed base.
- Schneider Electric: Schneider Electric (Square D) manufactures medium-voltage switchgear, protection relays, and circuit breakers for utility, industrial, and commercial applications. Overlaps with NBS's MV breaker and switchgear portfolio at much larger scale.
- Hubbell: Hubbell manufactures electrical products including medium-voltage switchgear, reclosers, and components for utility and industrial markets. Comparable breadth in adjacent electrical equipment categories to NBS.
- Siemens Energy: Siemens Energy produces medium- and high-voltage switchgear, vacuum breakers, and grid modernization solutions. Competes with NBS across switchgear and replacement breakers, including for legacy Siemens Allis installations.
Others
- Federal Pacific: Federal Pacific is a legacy manufacturer of dry-type transformers and switchgear components whose installed equipment NBS specifically targets with Citadel replacement breakers (e.g., Federal Pacific DST 15-5000). NBS benefits from Federal Pacific's aging installed base but does not directly compete.
Direct peers
- S&C Electric Company: S&C Electric manufactures medium-voltage switching and protection equipment, including reclosers and switchgear, for utility distribution and industrial power systems. Comparable to NBS's Citadel breaker, OUTLOOK Recloser, and switchgear product lines.
- G&W Electric: G&W Electric produces medium-voltage switchgear, reclosers, and solid-dielectric switchgear for utility and industrial applications. Direct overlap with NBS's medium-voltage switchgear and recloser offerings.
- Powell Industries: Powell Industries designs and manufactures custom-engineered medium-voltage switchgear, breakers, and integrated electrical house solutions for utilities and industrial customers. It competes most directly with NBS in custom MV/LV switchgear and power distribution equipment.
Market position
Strengths4 records
Weaknesses3 records
Competitive moat4 records
Key risks6 records
Key highlights6 records
Customer concentration
National Breaker Services social profiles
Digital presenceNational Breaker Services financial estimates
Financial estimateRevenue estimate
Valuation estimate
National Breaker Services leadership team
Management profileNumber of profiles
National Breaker Services funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
National Breaker Services M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about National Breaker Services
What does National Breaker Services do?
National Breaker Services designs, manufactures, and installs the Citadel line of medium-voltage vacuum circuit breakers (4,160V to 38kV) as direct roll-in replacements for obsolete GE, Westinghouse, Siemens Allis, Allis Chalmers, ITE, McGraw, and Federal Pacific breakers. The company also supplies custom engineered switchgear (indoor, outdoor, walk-in, and free-standing "Dog House" configurations up to 38kV/4000A/44kA), Transformer Primary Protection Units (TPPU), OUTLOOK Reclosers, and turnkey engineering/fabrication/installation services.
Is National Breaker Services a public or private company?
National Breaker Services is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was National Breaker Services founded?
National Breaker Services was founded in 1999. It employs 11 to 50 people.
Where is National Breaker Services based?
National Breaker Services is headquartered in Middlebury, United States, in the North America region.
How does National Breaker Services make money?
Four revenue lines are on record. Circuit Breaker Sales are the primary driver. The others are custom Switchgear, engineering Services and switchgear Retrofitting.
Who are National Breaker Services's main competitors?
Broad incumbents on record are Eaton, ABB, GE Vernova, Schneider Electric, Hubbell and Siemens Energy. Federal Pacific is listed as an others. Direct peers are S&C Electric Company, G&W Electric and Powell Industries.
Does National Breaker Services have an API?
No public API is recorded for National Breaker Services.
What industry is National Breaker Services in?
National Breaker Services's product category is Medium Voltage Switchgear. Its primary akta.pro industry code is IMAGAEAL, Medium-Voltage Distribution Components (MV breakers, disconnects, reclosers, MV terminations & joints), with a secondary code of EUADACAH, Circuit Breakers, Disconnectors, Earthing Switches & Switchgear Components. Its NAICS code is 335313 and its SIC code is 3613.