DC and AC power systems
Rectifier-charger, battery and protected distribution in a single cabinet.
- Output
- 24, 48, 110, 127, 220 V DC or 230 V AC
- Power
- 1 to 150 kW (48 V – 3,000 A)
- Backup
- up to 8 days
Power conversion and AC/DC backup power systems
Power electronics design office and workshop since 2001. Rectifier-chargers, inverters, DC/DC and DC/AC converters and battery-backed DC power systems, designed, built and serviced in Meyzieu, France, as one-offs or in series.
24 – 220 V DCDC voltages
50 · 60 · 200 · 400 HzAC outputs
600 VA – 160 kVADelivered ratings
3,000 ALargest 48 V DC system
Products
Every unit is sized from your power budget: input and output voltages, backup time, battery technology and installation constraints. The figures below come from delivered projects.
Chargers and rectifiers
Battery charging and float maintenance, supply of auxiliaries and safety circuits.
- Delivered
- 48 V – 500 A, 110 V – 190 A
- Booster
- cell charger 12 V – 75 A
- Batteries
- lead-acid, Ni-Cd, Ni-MH
Static converters
Voltage and frequency matching between a source and your equipment.
- Types
- DC/DC, DC/AC, AC/AC
- Frequencies
- 50, 60, 200, 400 Hz
- Delivered
- 400 Hz up to 160 kVA
- Form factor
- 19″ rack, enclosure, cabinet
Inverters
PWM inverters, fixed or on-board, and uninterruptible power supplies.
- On-board
- 48 V DC → 115 V 400 Hz, 600 VA
- Application
- SNCF rolling stock
- Locomotive
- 72 V DC → 230 V AC, 3,000 VA
Battery and protection cabinets
Ventilated battery cabinets with protection and distribution, delivered ready to connect.
- UPS
- 20 to 200 kVA
- Sizes
- 600×600×1000, 600×800×1800, 1000×650×1400, 850×850×1870 mm
- Drawings
- CAD, drilling plans supplied
Transformers and inductors
Isolation, voltage matching and filtering, cabinet-mounted or supplied on their own.
- Delivered
- 2 × 63 kVA three-phase in cabinet
- Bypass
- three-phase 60 kVA enclosure
Renewable energy
Stand-alone photovoltaic power for remote sites, with charge control and storage.
- Delivered
- ATEX solar system, offshore platform
- Storage
- battery sized for the required autonomy
Custom designs
Power and control boards developed when no off-the-shelf product fits.
- Power stage
- IGBT, SiC gate drivers
- Control
- microcontroller, C firmware
How a DC power system works
The rectifier-charger feeds the DC bus and keeps the battery on float charge. On mains failure, the battery, floating on the bus, takes over the load with zero transfer time. The inverter rebuilds the AC output, and a maintenance bypass lets you service the system without interrupting the loads.
Mains present: the rectifier feeds the DC bus and keeps the battery on float.
Design office and workshop
Design, manufacturing and commissioning are all done in-house. We also service power systems from other manufacturers.
More about our engineering office →
Power electronics
- Rectifiers, choppers, PWM inverters
- IGBT modules, SiC transistor gate drivers
- Magnetics design: transformers, filter inductors
Control and monitoring
- Microcontroller control boards, C firmware
- Modbus communication, serial / Ethernet gateways
- Fault signalling and remote monitoring
Integration
- Layout and wiring in cabinets, enclosures or 19″ racks
- CAD mechanical and drilling drawings
- Prototypes, small series, build-to-print
Multi-brand service
- Battery replacement, repair and recommissioning
- Eaton, Vertiv (Emerson), Chloride and Eltek equipment
- Backup-time sizing on existing sites
References
Selected projects in France and abroad.
| Project | Ratings | Customer / location |
|---|---|---|
| High-power telecom DC power system48 V rectifiers, batteries and distribution | 48 V DC – 3,000 A 150 kW | Snef, for Gabon Télécom |
| Frequency converterExport, Middle East | 400 Hz – 160 kVA | Export |
| Locomotive invertersRailway rolling stock | 72 V DC → 230 V AC 3,000 VA | Deutsche Bahn |
| Uninterruptible power supplyTwo parallel 80 kVA UPS units, batteries | 160 kVA | Kuwait |
| No-break AC power systemSeismograph supply, battery cabinet + electronics cabinet | 24 V DC – 100 A 8-day autonomy | Kenya |
| Stand-alone solar power systemOffshore oil platform | ATEX zone | Offshore |
| Telecom DC power systemsIndoor and outdoor versions | 48 V DC – 8 kW 48 V DC – 1 kW | Monaco Telecom |
| On-board inverterRolling stock | 48 V DC → 115 V 400 Hz 600 VA | SNCF |
| DC power systemTramway network | 48 V DC – 3 kW 3 rectifier modules | TAM, Montpellier |
| Transformer cabinet | 2 × 63 kVA three-phase | Montpellier |
| Bypass enclosure | Three-phase 60 kVA | Industrial |
| Power transformer | 60 kVA | Monaco |
| DC power system | 24 V – 60 Ah, Ni-MH | Industrial customer |
Customers and main contractors
- SNCF
- Deutsche Bahn
- RATP
- RTE
- EDF
- Engie
- Storengy
- Aéroports de Paris
- IFP Énergies nouvelles
- Eau du Grand Lyon
- Vinci
- Spie
- Snef
- Ineo / Equans
- Vertiv
- Eaton
- Chloride
- Eltek
Export projects: Kuwait, United Arab Emirates, Kenya, Gabon, Senegal, Seychelles, Monaco.
Sectors: industry, energy, petrochemicals, transport and rail, telecoms, electrical contractors, environment, solar, public sector.
The company
Charles Caumont founded CAUM.ELEC in 2001, after more than 30 years in power electronics. An electronics engineer by training, he gave the company a rigorous, quality-driven approach from day one.
Based in Meyzieu, east of Lyon, CAUM.ELEC designs systems around each customer's requirements, very often custom-built, balancing quality, efficiency and cost.
In 2026 the company passed to a new generation. The workshop, methods and know-how remain the same.
Contact
For a quotation, please give at least the input and output voltages, the power and the required backup time. An engineer will reply to you directly.
Phone+33 6 03 84 43 97
+33 6 09 15 29 55
Emailcontact@caum-elec.com
Address8 rue du Professeur Roux, 69330 Meyzieu, France