FSM
FSM AG is a privately held German electronics manufacturer founded in 1989 in Kirchzarten that designs and produces Battery Management Systems, measurement technology, transformer switching relays, and contract electronics manufacturing services (E²MS) for enterprise customers in medical, industrial, and e-mobility end markets.
- Company typePrivate
- Founded1989
- HeadquartersKirchzarten, Germany
- Headcount101–250
- GTM typeB2B
- OfferingHardware or Manufacturing
What FSM does
FSM AG is a privately held German electronics manufacturer founded in 1989 and headquartered in Kirchzarten near Freiburg, Germany. The company designs and produces intelligent electronic subsystems that are typically integrated as components inside customer end products across four business areas: Battery Management Systems (BMS) for lithium-ion battery packs, measurement technology, transformer switching relays (Trafosanfteinschalter / inrush current limiters), and E²MS — a full-service Electronics Development & Manufacturing offering spanning electronics and software design, prototyping, SMD/THT assembly, conformal coating, CNC machining, and lifecycle support. Its flagship BMS offering combines a standardized catalog line (BMSmart S/M/L for 2–10 cell series applications, with published unit pricing) with custom-engineered BMS solutions, complemented by a proprietary bidirectional USB-C universal charger (up to 240W, 48V).
FSM serves enterprise B2B customers in safety- and reliability-sensitive industries including medical devices (Boehringer Ingelheim, Fresenius Kabi, Weinmann Emergency), building automation (BELIMO), industrial measurement (JUMO), safety systems (HEKATRON), battery technology (VARTA), marine electric propulsion (Torqeedo), and automotive diagnostics (Hella Gutmann). The company monetizes through two complementary revenue streams: (i) hardware sales of BMS, measurement, and transformer switching products, and (ii) professional services across BMS development and E²MS contract manufacturing, with project lifecycles spanning consulting, design, prototyping, series production, and long-term after-sales support.
FSM operates a single manufacturing and engineering site in Kirchzarten with 125 employees, reached approximately EUR 29.5M in revenue in 2025, and is led by an Executive Board of Konrad Molz and Benjamin Schlegel under the Chairmanship of Eugen Molz. The company differentiates through functional safety expertise (IEC 61508, ISO 13849, ISO 26262), regulatory compliance support (UN 38.3, IEC 62133, UL 62133, EU Battery Regulation including digital Battery Passport), proprietary inline ICT/FCT test systems with a custom cell simulator, 2D QR-code traceability on every PCB, and a Germany-based vertically integrated production footprint.
FSM firmographics
Firmographics- Name
- FSM
- Legal name
- FSM AG
- Website
- https://fsm.ag
- Company type
- Private
- Founded year
- 1989
- Operating status
- Operating
- Headcount range
- 101–250 employees
- Short description
- FSM AG is a privately held German electronics manufacturer founded in 1989 in Kirchzarten that designs and produces Battery Management Systems, measurement technology, transformer switching relays, and contract electronics manufacturing services (E²MS) for enterprise customers in medical, industrial, and e-mobility end markets.
- Ownership category
- akta.pro rank
FSM industry classification
Industry- Product category
- Industrial Electronics Manufacturing
- NAICS
- Relay and Industrial Control Manufacturing (335314), Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables (334513), Electrical Equipment Manufacturing (3353)
- SIC
- Electronic & Other Electrical Equipment (No Computer Equip) (3600), Industrial Instruments For Measurement, Display, And Control (3823), Switchgear & Switchboard Apparatus (3613)
- akta.pro primary industry
- Battery Management Systems (BMS) & Battery Electronics (IMAGAHAC)
- akta.pro secondary industry
- Battery Management System (BMS) & HV Control Electronics Manufacturing (IMACACAH)
Keywords
Where FSM is headquartered
LocationHeadquarters
- HQ city
- Kirchzarten
- HQ country
- Germany
- HQ region
- Europe
Offices2 records
Markets served
FSM business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Personnel, Operations, Technology or R&D, Supply Chain, Marketing or Sales, Infrastructure
Revenue model
- Battery Management Systems (BMS) Products: Sale of customized battery management systems including standard BMSmart product line (S, M, L variants) and custom BMS solutions. Products are typically integrated into customer end products as key electronic components.
- BMS Development Services: Comprehensive development services covering electronics, software, layout, and mechanical development from initial product idea through prototyping to series production and product maintenance.
- E²MS (Electronics Development & Manufacturing Services): Full-service electronics manufacturing including SMD/THT assembly, conformal coating, testing, and device assembly. Services span product engineering, supply chain management, industrial engineering, and packaging/logistics.
- Measurement Technology Products: Measurement technology products and systems for various industrial applications.
- Transformer Switching Relay Products: Inrush current limiters (TrafoSanfteinschalter) for transformer protection.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Unit Pricing | Pay-as-you-go | BMSmart S - Small series BMS (2-4 cells) |
| Unit Pricing | Pay-as-you-go | BMSmart M - Medium series BMS (4-6 cells) |
| Unit Pricing | Pay-as-you-go | BMSmart L - Large series BMS (7-10 cells) |
| Unit Pricing | Pay-as-you-go | Bidirectional USB-C Universal Charger |
Go-to-market motion2 records
Distribution channels1 record
Marketing channels5 records
FSM product offering
Product offeringCore offering
FSM AG designs, develops, and manufactures intelligent electronic components and subsystems, with four core business areas: Battery Management Systems (BMS) for lithium-ion batteries, Measurement Technology (Messtechnik), Transformer Switching Relays (Trafosanfteinschalter), and E²MS (Electronics Development & Manufacturing Services). Most work is customer-specific and becomes an integrated part of the customer's end product.
Product overview
FSM AG is a German manufacturer of intelligent electronics offering four integrated business areas: Battery Management Systems (BMS), Measurement Technology, Transformer Switching Relays (Trafosanfteinschalter), and E²MS (development and manufacturing services for electronic components). The BMSmart product line provides standardized battery management systems (S, M, L variants) for quick deployment in 2-10 cell applications, complemented by a Bidirectional USB-C Universal Charger supporting up to 240W. Custom BMS development, prototyping, and series production services are available through E²MS. Manufacturing capabilities include SMD/THT assembly, press-fit technology, conformal coating, and mechanical processing. The company emphasizes functional safety compliance and regulatory certification support across all product areas.
Differentiator
Problem solved
Functional benefit
Brands
- BMSmart: Standard Battery Management System product line offering quick delivery and cost-effective solutions for small quantities, including BMSmart S, M, and L models.
- E²MS
- BMS (Batterie-Management-Systeme)
- Messtechnik
- Trafosanfteinschalter
Products and services
- BMSmart Standard Battery Management System Product Line Standardized battery management system product family (BMSmart S for 2-4 cells, BMSmart M for 4-6 cells, BMSmart L for 7-10 cells) featuring SMBus interface, gas gauging, balancing, over/under-voltage protection, short-circuit protection, temperature shutdown, and Second Level Protection. Targeted at manufacturers needing quickly available, cost-effective BMS for small production quantities.
- Bidirectional USB-C Universal Charger Integrated bidirectional charger supporting nearly any voltage up to 48V with up to 240W power delivery. Enables batteries to function as powerbanks. Designed for OEMs integrating USB-C charging into battery-powered products.
- Custom Battery Management System (BMS) Solutions Customer-specific Battery Management Systems for lithium-ion batteries with monitoring of voltage, current, and temperature. Includes 1st Level Protection (reversible) and 2nd Level Protection (irreversible), with BUS-system communication (I2C, SMBus, CAN, LIN, RS232). Built for manufacturers needing tailored BMS integrated into their end products.
- Measurement Technology (Messtechnik) Measurement technology products and systems for various industrial measurands and applications. Offered as one of FSM's four core business areas for industrial customers.
- Transformer Switching Relays (Trafosanfteinschalter) Soft-switching devices (inrush current limiters) for transformer protection. Offered as one of FSM's four core business areas for industrial customers requiring controlled transformer energization.
- E²MS (Electronics Development & Manufacturing Services) Full-service development and manufacturing services for electronic components covering product engineering, supply chain management, industrial engineering, testing technology, SMD/THT production, conformal coating, assembly, and packaging/logistics. Targets customers needing a single partner from consulting and development through series production.
- Battery Certification and Compliance Services Regulatory certification support for lithium-based battery packs covering UN 38.3 transport testing, IEC 62133 / UL 62133 safety certification with CB Report and UL certification options, UL 2054 certification for household and commercial devices, and EU Battery Regulation (EU 2023/1542) compliance including digital Battery Passport with lifecycle data, CO2 footprint, and recycling information.
Quantifiable outcome
- Up to 98% efficiency for USB-C charger technology
- +3 more outcomes
Companies that use FSM
Customer profileNamed customers11 records
Segments4 records
Ideal customer profiles4 records
FSM technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature6 records
FSM partnerships and signals
Strategic signalScale indicators5 records
Recent moves6 records
Expansion highlights5 records
FSM competitors and assessment
Company assessmentBroad incumbents
- VARTA AG: German battery manufacturer spanning microbatteries, lithium-ion cells and energy storage solutions. Listed as an FSM customer (battery technology) but also a potential competitor in lithium-ion systems and integrated BMS at significantly larger scale.
- Analog Devices (BMS portfolio): Global semiconductor vendor offering battery management ICs and reference designs used inside industrial BMS boards. Comparable as the silicon platform that FSM competes against or integrates with, and as a broad incumbent in the underlying BMS technology stack.
- AKASOL (BorgWarner): German high-performance battery systems manufacturer for commercial vehicles, now part of BorgWarner. Overlaps with FSM's BMS and pack activities for e-mobility and industrial customers, but operates at much larger scale and is owned by a global Tier-1 supplier.
- Texas Instruments: Major semiconductor company whose battery monitor and protector IC family underpins much of the industrial BMS market. Competes with FSM at the silicon-reference-design layer and sets the cost benchmark that FSM's custom BMS designs must justify.
Emerging players
- IES Synergy: French designer and manufacturer of battery chargers and BMS for industrial, EV and stationary applications. Comparable niche specialist competing in the same BMS/charger space as FSM, with overlap on industrial and e-mobility customers.
- Ewert Energy Systems: US-based smaller BMS and battery monitoring product company serving EV, industrial and stationary storage OEMs. Comparable to FSM as a niche specialist competitor with overlapping customer use cases, though with a more standardized product go-to-market.
Direct peers
- Zollner Elektronik: Large German EMS provider offering electronics development and manufacturing services across medical, industrial and automotive customers. Directly comparable on the E²MS side of FSM's business and on customer type, though at materially larger scale and broader portfolio.
- BMZ Group: German manufacturer of lithium-ion battery systems and BMS solutions serving e-mobility, medical, industrial and power tool customers. Comparable in geography, vertical scope (cells-to-BMS-to-pack) and customer overlap with FSM, though larger in scale.
- Lithium Balance: Danish BMS specialist designing and manufacturing lithium-ion battery management systems for mobility, marine and industrial applications. Closest direct peer to FSM in product category, target customer profile (OEMs needing safety-certified BMS) and company scale.
- Elithion: US-based BMS developer offering custom and standard battery management systems for industrial, EV and stationary storage applications. Directly comparable as a small specialist BMS design house competing for similar OEM design wins.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights6 records
Customer concentration
FSM social profiles
Digital presenceFSM financial estimates
Financial estimateRevenue estimate
Valuation estimate
FSM leadership team
Management profileNumber of profiles
Profiles8 records
FSM funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
FSM 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 FSM
What does FSM do?
FSM AG designs, develops, and manufactures intelligent electronic components and subsystems, with four core business areas: Battery Management Systems (BMS) for lithium-ion batteries, Measurement Technology (Messtechnik), Transformer Switching Relays (Trafosanfteinschalter), and E²MS (Electronics Development & Manufacturing Services). Most work is customer-specific and becomes an integrated part of the customer's end product.
Is FSM a public or private company?
FSM is a private company. It is classified as family owned and is currently operating.
When was FSM founded?
FSM was founded in 1989. It employs 101 to 250 people.
Where is FSM based?
FSM is headquartered in Kirchzarten, Germany, in the Europe region.
How does FSM make money?
Five revenue lines are on record. Battery Management Systems (BMS) Products are the primary driver. The others are BMS Development Services, E²MS (Electronics Development & Manufacturing Services), measurement Technology Products and transformer Switching Relay Products.
Who are FSM's main competitors?
Broad incumbents on record are VARTA AG, Analog Devices (BMS portfolio), AKASOL (BorgWarner) and Texas Instruments. Emerging players are IES Synergy and Ewert Energy Systems. Direct peers are Zollner Elektronik, BMZ Group, Lithium Balance and Elithion.
Does FSM have an API?
No public API is recorded for FSM.
What industry is FSM in?
FSM's product category is Industrial Electronics Manufacturing. Its primary akta.pro industry code is IMAGAHAC, Battery Management Systems (BMS) & Battery Electronics, with a secondary code of IMACACAH, Battery Management System (BMS) & HV Control Electronics Manufacturing. Its NAICS code is 335314 and its SIC code is 3600.