Schaefer
Schaefer is a privately held US manufacturer of rugged power conversion systems (DC-DC, AC-DC, DC-AC, AC-AC converters, active harmonic filters, energy storage) from 50W to 10MW+, serving military, rail, shipboard/subsea, oil & gas, and industrial automation customers globally.
- Company typePrivate
- Founded1975
- HeadquartersHopkinton, United States
- Headcount101–250
- GTM typeB2B
- OfferingHardware or Manufacturing
What Schaefer does
Schaefer, Inc. is a privately held US power conversion manufacturer founded around 1975 and headquartered in Hopkinton, Massachusetts, with additional operations in Germany (Europe) and the UAE (Middle East). The company designs and manufactures ruggedized AC-DC power supplies and battery chargers, DC-DC converters, DC-AC pure sine wave inverters, AC-AC frequency converters, active harmonic filters, energy storage systems, and electronic loads spanning 50W modules to 10MW+ system configurations. Schaefer's technology leverages industrial-grade components, sealed enclosures (up to IP69), ultra-wide temperature tolerance (-40°C to +75°C), and proprietary IGBT-based architectures (PowerStack series at 97% efficiency), with proprietary features including liquid-cooled active harmonic filters, subsea converters accepting up to 5000VDC, and MIL-STD-certified military product lines.
The company operates three product tiers: over 6,000 COTS (Commercial Off-The-Shelf) power solutions from 500W to 3MW, more than 100,000 MOTS (Modified Off-The-Shelf) units, and over 2,000 fully custom power solutions. Revenue is generated through direct enterprise hardware sales on a quote-based pricing model with multi-year contracts, supported by custom engineering services that include thermal analysis, FMECA, HALT/HASS, and MTBF testing — frequently delivered with little or no NRE. Schaefer's go-to-market is sales-led, targeting mission-critical applications in military and defense, heavy and light rail (EN 50155 compliant), shipboard and subsea, oil and gas, industrial automation, and alternative energy/utility storage. The company's competitive position rests on accumulated MIL-STD and ITAR certifications, five decades of harsh-environment engineering expertise, and a direct technical sales motion that supports complex specification-driven buying cycles in defense, transit, and process industry accounts.
Schaefer firmographics
Firmographics- Name
- Schaefer
- Legal name
- Schaefer, Inc.
- Website
- https://schaeferpower.com
- Company type
- Private
- Founded year
- 1975
- Operating status
- Operating
- Headcount range
- 101–250 employees
- Short description
- Schaefer is a privately held US manufacturer of rugged power conversion systems (DC-DC, AC-DC, DC-AC, AC-AC converters, active harmonic filters, energy storage) from 50W to 10MW+, serving military, rail, shipboard/subsea, oil & gas, and industrial automation customers globally.
- Ownership category
- akta.pro rank
Schaefer industry classification
Industry- Product category
- Industrial Power Conversion Systems
- NAICS
- Electrical Equipment Manufacturing (33531), Power, Distribution, and Specialty Transformer Manufacturing (335311), Relay and Industrial Control Manufacturing (335314)
- SIC
- Electronic & Other Electrical Equipment (No Computer Equip) (3600), Electronic Coils, Transformers & Other Inductors (3677), Power, Distribution & Specialty Transformers (3612)
- akta.pro primary industry
- DC-DC Converters & Power Modules (Isolated/non-isolated, POL modules) (IMAGADAB)
- akta.pro secondary industries
- High-Voltage & High-Power Conversion (HVDC supplies, traction/rail converters, large rectifiers) (IMAGADAH), Power Conversion Systems (PCS), Inverters & Transformers for BESS (EUAFAAAE), Solid-State Transformers (SST) & Power Electronic Transformers (EUAFAIAF)
Keywords
Where Schaefer is headquartered
LocationHeadquarters
- HQ city
- Hopkinton
- HQ country
- United States
- HQ region
- North America
Offices2 records
Markets served
Schaefer business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Personnel, Supply Chain, Operations, Technology or R&D, Infrastructure, Marketing or Sales
Revenue model
- Power Conversion Hardware Sales: Sales of standard COTS (Commercial Off-The-Shelf) power converters including DC-DC converters, AC-DC power supplies, DC-AC inverters, AC-AC frequency converters, and battery chargers. Products range from 50W to 40kW per module, with systems scalable to 10MW+. The company also manufactures over 100,000 MOTS (Modified Off-The-Shelf) units.
- Custom Power Solutions: Design and manufacture of fully custom power solutions for specific application requirements. With over 2,000 custom designed power products delivered, Schaefer provides engineering services from concept to production including thermal analysis, FMECA, HALT, HASS, and MTBF testing. Custom modifications typically with little or no NRE (Non-Recurring Engineering) charges.
- Energy Storage Systems: Sale of SCS (Energy Storage) family products including air or liquid cooled energy storage solutions for mission critical or remote location requirements. Systems operate up to 1200VDC and up to Megawatts when configured in system solutions.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | Custom Quote-Based Pricing |
Go-to-market motion1 record
Distribution channels4 records
Marketing channels4 records
Schaefer product offering
Product offeringCore offering
Schaefer designs and manufactures rugged power conversion systems including DC-DC converters, AC-DC power supplies, DC-AC inverters, AC-AC frequency converters, and active harmonic filters spanning 50W to 10MW+. The company offers more than 6,000 COTS (Commercial Off-The-Shelf), 100,000+ MOTS (Modified Off-The-Shelf), and 2,000+ Custom Power Solutions engineered for harsh environments in military, ship/subsea, railway, industrial automation, oil & gas, and alternative energy sectors. Products feature MIL-STD certifications, ITAR compliance, sealed enclosures up to IP69, and ultra-wide operating temperature ranges from -40°C to +75°C.
Product overview
Schaefer is a manufacturer of rugged power conversion solutions offering over 6,000 COTS Power Solutions from 500W to 3MW, over 100,000 MOTS, and over 2,000 Custom Power Solutions. The product portfolio centers on power conversion technology across multiple form factors and power ranges. Core product lines include: (1) AC-DC Power Supplies and Battery Chargers spanning the C/B 600 through C/B 6600 Series (500W to 30kW), (2) DC-DC Converters with similar power ranges and input voltages up to 800VDC, (3) Active Harmonic Filters including the PB Series, PB-W Wall Mount, and PBAF 690-560 Liquid Cooled models for power quality management, (4) DC-AC Pure Sine Wave Inverters including the Series IT and IV (700W to 45kVA), (5) AC-AC Frequency Converters, (6) Energy Storage Solutions including the SCS Family and PowerStack Series (400kW to 10MW+ at up to 97% efficiency), (7) Electronic Loads including the LW 5100 Series Gen 2, and (8) Specialized Military Power Solutions including the MIL-K Series for COTS and MOTS applications. The company also offers Custom Power Solutions with design engineering services and no/low NRE. Products serve harsh environments in transit/railway, military, ship/subsea, oil and gas, industrial automation, and alternative energy industries.
Differentiator
Problem solved
Functional benefit
Products and services
- Active Harmonic Filters Active harmonic filter systems (PB Series, PB-W Wall Mount, Power Balance Kxxx, and PBAF 690-560 liquid cooled) that monitor current signals and compensate for unwanted harmonic elements, improving power factor and meeting IEEE-519 (5% TDD) and Mil-Std-1399 (<3% THDi). Compensation current ranges from 60A to 1000s of amps across modular cabinet configurations.
- AC-DC Power Supplies & Battery Chargers Complete C/B Series line of AC-DC power supplies and battery chargers from 500W (C/B 600 Series) up to 30kW (C/B 6600 Series), including high voltage C5800HV (up to 3000VDC output) and high input voltage C4500HV (up to 3000VDC input) variants. Over 100 standard models per major series with DC input ranges from 10VDC to 800VDC and output voltages from 5VDC to 400VDC at efficiencies up to 95%.
- DC-DC Converters DC-DC converter modules including C/B 600, C/B 3500, C/B 3700, C/B 4500, CB 4800, C/B 5100, CB 5600, C/B 5800, C/B 6600, and C4500HV/C5800HV high voltage series. Power ratings from 500W to 30kW with multiple standard DC input ranges (10VDC to 800VDC) and output voltages (5VDC to 400VDC). Efficiencies up to 95%.
- DC-AC Pure Sine Wave Inverters Broad range of DC-AC pure sine wave inverters with power ratings from 700W to 45kVA. Includes Series IT (6kVA to 90kVA single or three-phase switch mode inverter systems with integrated UPS and parallel capabilities), Series IV (3-phase output with synchronized switch mode inverters and output transformers, 0.6 to 45kVA), and Signal Redundancy DC/AC Inverter Systems (5-70 kVA).
- AC-AC Frequency Converters Rugged AC-AC frequency inverters offering power ratings from 0.5KVA to 45KVA with pure sine wave output, single or three-phase inputs, and industrial design suitable for complex loads.
- DC-DC Step-up Converters
Quantifiable outcome
- Up to 97% efficiency on PowerStack series
- +3 more outcomes
Companies that use Schaefer
Customer profileSegments7 records
Ideal customer profiles4 records
Schaefer technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature5 records
Schaefer partnerships and signals
Strategic signalScale indicators4 records
Recent moves6 records
Expansion highlights5 records
Schaefer competitors and assessment
Company assessmentDirect peers
- XP Power: Global supplier of AC-DC power supplies, DC-DC converters, and high-voltage power solutions for industrial, healthcare, and defense applications; comparable to Schaefer across topologies and ruggedized product positioning.
- SynQor: Specialist in military-grade DC-DC converters, AC-DC supplies, and rugged power conversion for defense and industrial markets; closely aligned with Schaefer's MIL-K and C/B-series defense offerings.
- North Atlantic Industries (NAI): Supplier of rugged COTS power supplies, intelligent I/O, and embedded computing for defense and industrial applications, with overlapping MIL-STD power conversion products.
- TDK-Lambda: Manufacturer of industrial and programmable DC power supplies, DC-DC converters, and EMI filters, with MIL-spec variants targeted at defense, rail, and industrial automation — directly overlapping Schaefer's C/B-series converter portfolio and ruggedized AC/DC line.
- Vicor Corporation: Designs high-density DC-DC converters and AC-DC front-end modules for defense, industrial, and rail applications, overlapping with Schaefer's high-efficiency PowerStack and converter modules.
- Astrodyne TDI: Manufacturer of power supplies, EMI filters, and rugged power conversion products for industrial, medical, and military customers; directly comparable as a mid-sized private/public power conversion peer.
Broad incumbents
- Eaton: Diversified power management company serving industrial, aerospace, and defense markets with rugged converters, power supplies, and power quality products that overlap Schaefer's defense and industrial portfolios.
- Crane Aerospace & Electronics: Division of Crane Co. supplying rugged power conversion, sensing, and electronic systems for defense and commercial aerospace; broader incumbent with overlapping MIL-spec power products.
- ABB: Global industrial and power technology major offering power conversion, drives, and grid solutions across rail, oil & gas, renewables, and industrial automation, providing a much larger incumbent benchmark for Schaefer's high-power and rail businesses.
Emerging players
- Aegis Power Systems: Custom power supply manufacturer focused on military, industrial, and rugged applications; comparable niche custom-engineering business model to Schaefer's custom solutions group.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
Schaefer social profiles
Digital presenceSchaefer compliance and trust
Trust signalCompliance26 records
Schaefer financial estimates
Financial estimateRevenue estimate
Valuation estimate
Schaefer leadership team
Management profileNumber of profiles
Schaefer funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Schaefer 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 Schaefer
What does Schaefer do?
Schaefer designs and manufactures rugged power conversion systems including DC-DC converters, AC-DC power supplies, DC-AC inverters, AC-AC frequency converters, and active harmonic filters spanning 50W to 10MW+. The company offers more than 6,000 COTS (Commercial Off-The-Shelf), 100,000+ MOTS (Modified Off-The-Shelf), and 2,000+ Custom Power Solutions engineered for harsh environments in military, ship/subsea, railway, industrial automation, oil & gas, and alternative energy sectors. Products feature MIL-STD certifications, ITAR compliance, sealed enclosures up to IP69, and ultra-wide operating temperature ranges from -40°C to +75°C.
Is Schaefer a public or private company?
Schaefer is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Schaefer founded?
Schaefer was founded in 1975. It employs 101 to 250 people.
Where is Schaefer based?
Schaefer is headquartered in Hopkinton, United States, in the North America region.
How does Schaefer make money?
Three revenue lines are on record. Power Conversion Hardware Sales are the primary driver. The others are custom Power Solutions and energy Storage Systems.
Who are Schaefer's main competitors?
Direct peers on record are XP Power, SynQor, North Atlantic Industries (NAI), TDK-Lambda, Vicor Corporation and Astrodyne TDI. Broad incumbents are Eaton, Crane Aerospace & Electronics and ABB. Aegis Power Systems is listed as an emerging player.
Does Schaefer have an API?
No public API is recorded for Schaefer.
What industry is Schaefer in?
Schaefer's product category is Industrial Power Conversion Systems. Its primary akta.pro industry code is IMAGADAB, DC-DC Converters & Power Modules (Isolated/non-isolated, POL modules), with a secondary code of IMAGADAH, High-Voltage & High-Power Conversion (HVDC supplies, traction/rail converters, large rectifiers). Its NAICS code is 33531 and its SIC code is 3600.