Designer and Manufacturer: We act as architects, developers, and producers of electronic solutions (boards, cables, enclosures, etc.) and associated testing equipment (test benches, test rigs, etc.) for small to medium production runs.
SEF Power is a French SME specializing in high value-added electronic systems
SEF Power is a French SME specialized in the design, manufacturing, and commercialization of high value-added electronic systems, primarily intended for the railway, defense, and aerospace sectors.
We support our clients throughout the entire product lifecycle, from prototype to small or large-scale production, adapting our approach to your technical, regulatory, and industrial constraints.
Comprehensive expertise, from design office to final integration
Our organization relies on an internal design office with expertise in both hardware and software, as well as a production workshop certified IPC-A-610 Class 3, ensuring manufacturing quality that meets the most stringent standards.
We offer turnkey solutions in critical technical areas such as:
- Power conversion
- Motor control
- Embedded and ruggedized electronic systems
A complete offering in electronic subcontracting (EMS)
In addition to our engineering activities, SEF Power provides electronic subcontracting (EMS) services, including:
- Component sourcing
- PCB assembly (SMT and wired)
- Mechanical integration
- Functional testing of your equipment
This approach allows us to offer a comprehensive, responsive, and customized solution, tailored to the needs of both large corporations and industrial SMEs.
Strong references and national recognition
Among our clients are leading players such as SNCF, MBDA, Thales, Safran, and Eurotunnel, as well as numerous SMEs in the industrial and technological sectors.
ISO 9001 and EN 9100 certified, SEF Power was also a recipient of the French Recovery Plan in 2022 — a strong mark of recognition for our contribution to industrial sovereignty and national economic recovery.
As part of its Corporate Social Responsibility (CSR) commitments, SEF Power implements responsible industrial practices, including optimizing energy consumption, recycling and recovering electronic waste, and selecting components that comply with international environmental directives (RoHS, REACH).
All the staff are located in a modern facility in the Paris area.
Company History
1993 – Creation of SEF Industrie
2020 – Activities taken over by Samuel ROGNON under the name SEF Power
2022 – SEF Power certified ISO 9001 and EN 9100
2022 – Creation of the holding company Altes, integrating SEF Power and acquiring CNB Electronique
2022 – SEF Power awarded the French Recovery Plan (Plan de Relance). The company invests heavily in design and electronic production capabilities
2024 – SDS High Voltage joins the Altes group, expanding expertise in high-voltage power conversion for medical and laser markets
2024 – SEF Power awarded PM'UP Ile de France. This support enables new investments to strengthen the design office and production capabilities
2025 – Co-development SEF Power / CNB Electronique and commercialization of a new generation of high-performance modular converters and motor control systems for the defense market:
- AC/DC Power Supply: ACM 750 Series
- DC/DC Converter: DCM 500 Series
- Brushless Motor Control