Development and production of intelligent electronics: battery management systems, measurement technology, transformer soft-start switches and E²MS contract manufacturing.
FSM AG
KirchzartenNew on Amplifa
Intelligent Electronics from Kirchzarten
FSM AG, headquartered in Kirchzarten near Freiburg, develops and produces intelligent electronics for customized applications. The company supports its customers in four business areas: battery management systems and protection and charging circuits for lithium-ion batteries, measuring transducers and measuring systems (including pressure transducers), transformer soft-start switches for avoiding inrush current surges, as well as development and manufacturing services for electronic components (E²MS). As part of its contract manufacturing, the portfolio covers complete electronics assembly on two SMD lines with a capacity of 1,200 components per hour each, conformal coating technology, final assembly up to the fully tested printed circuit board, as well as the assembly of accumulators. Manufacturing quality is ensured by electronic and optical inspection methods and a final functional test; QR codes on the printed circuit boards enable component-level traceability across all manufacturing parameters. The industries covered include medical technology and mobile power supply. Founded in 1989, the company employs 125 staff and generated revenue of €29.5 million in 2025; it has been operating climate-neutrally since December 2021.
- Site
- Kirchzarten
- Processes
- SMD assembly (electronics manufacturing), Contract manufacturing of electronic components including electronics assembly, conformal coating, Conformal coating technology, Electronic and optical inspection methods, test and control concepts, final functional testing, Development and manufacturing service for electronic components (consulting, development,, Development and production of battery management systems, protection and charging circuits for, Assembly of accumulators, Development, production and sale of transformer soft-start switches (inrush current limiters)
- Materials
- Accumulators (lithium-ion), Accumulators (NiCd), SMD Assembly, Contract Manufacturing of Electronic Components, Lithium-Ion Battery Technology, NiCd Battery Technology, Transformer Soft-Start Switches
- Certificates
- ISO 9001:2015, ISO 14001:2015
- Founded
- 1989
- Employees
- 125
- Industries
- Medical Technology, Mobile Power Supply / Battery Technology, Electronics Industry
- 01
Consulting and Design
- 02
Development
- 03
Material Procurement
- 04
SMD Assembly
- 05
Conformal Coating
- 06
Final Assembly
- 07
Inspection and Functional Testing
- 08
Sales
Processes and Technologies
SMD Assembly
Two assembly lines with 1,200 components per hour each for electronics manufacturing.
Contract Manufacturing of Electronic Components
Complete contract manufacturing including engineering services, conformal coating and final assembly up to the fully tested printed circuit board.
Lithium-Ion Battery Technology
Protection and charging circuits as well as battery management systems and assembly of accumulators.
NiCd Battery Technology
Charging technology for NiCd batteries since 1992, the foundation of the mobile power supply business.
Transformer Soft-Start Switches
Inrush current limiters, optionally with half-cycle failure detection according to EN 61000-4-11 for medical devices.
Site
Kirchzarten
DEHeadquarters with development, production and administration
- Lot size
- Small to medium series, customized
- Materials
- Electronic components, printed circuit boards, accumulators
- 2 SMD assembly lines
- Conformal coating technology
- Inspection and test systems
- Final assembly
Products and Assemblies
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| SMD assembly (electronics manufacturing)Assembly | – | – | – | – | Electronic components, Printed circuit boards |
| Contract manufacturing of electronic components including electronics assembly, conformal coatingAssembly | – | – | – | – | Electronic components, Printed circuit boards |
| Conformal coating technologySurface | – | – | – | – | Printed circuit boards |
| Electronic and optical inspection methods, test and control concepts, final functional testingTesting | – | – | – | – | – |
| Development and manufacturing service for electronic components (consulting, development,Engineering | – | – | – | – | – |
| Development and production of battery management systems, protection and charging circuits forEngineering | – | – | – | – | – |
| Assembly of accumulatorsAssembly | – | – | – | – | Accumulators (lithium-based, NiCd) |
| Development, production and sale of transformer soft-start switches (inrush current limiters)Engineering | – | – | – | – | – |
| Development, production and sale of measuring transducers/systems (including pressure transducers)Engineering | – | – | – | – | – |
| USB-C chargers (product development/production)Engineering | – | – | – | – | – |
2 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| SMD assembly line | – | 2 | Assembly capacity: 1,200 components per hour (per line) | – | Kirchzarten |
| SMD assembly system (first line) | – | 1 | 600–1,200 components per hour | 2000 | Kirchzarten |
Additional services
Quality and Environmental Management
Manufacturing quality is ensured through modern electronic and optical inspection methods, comprehensive test and control concepts, and a final functional test. QR codes on the printed circuit boards enable traceability at component level and across all manufacturing parameters.
| Evidence | Kirchzarten |
|---|---|
| ISO 9001:2015 | |
| ISO 14001:2015 |
Company History
- 1989
Foundation of FSM Elektronik GmbH by Bela Fekete, Hubert Schlegel and Eugen Molz; first pressure transducer developed and sold.
- 1992
Development of the first charging technology for NiCd batteries.
- 1993
Expansion of the operating area to 300 m² by converting a barn.
- 1998
License to use a patent for avoiding inrush current surges in transformers; first transformer soft-start switches.
- 2000
Relocation to Kirchzarten with 1,100 m² of operating area; commissioning of the first SMD production line.
- 2001
Development and production of the first lithium-ion protection circuits.
- 2005
Building raised to 2,400 m²; acquisition of the second SMD assembly line.
- 2008
Founder Bela Fekete leaves the company and sells his shares to Jürgen Schlegel, Andreas Schlegel and Konrad Molz.
- 2012
Renaming to FSM AG.
- 2016
Move into the new building with 4,600 m² of operating area; founders move to the supervisory board.
- 2021
Climate-neutral operation since December 2021; second place at the New Work Award (XING).
- 2023
Awarded as Job Engine of Southern Baden.
- 2025
Revenue €29.5 million; the board consists of Konrad Molz and Benjamin Schlegel.