Manufacturer of custom transformers, inductors and injection-moulded parts including encapsulation, toolmaking and module assembly.
Weiss Elektrotechnik GmbH
Johanniskirchen (DE) · Ostermiething (AT) · Poland (manufacturing site)New on Amplifa
About Weiss Elektrotechnik
Weiss Elektrotechnik GmbH has been developing and manufacturing customer- and application-specific wound components since 1979, specialising in small and medium production volumes. The portfolio includes single- and multi-phase mains transformers with power ratings up to 15 kVA, DC power supplies up to 500 W, and inductors for low- and high-frequency applications such as coils, chokes, transformers, transducers and high-frequency components – from the coreless air coil to the vacuum-encapsulated high-voltage transformer. The offering is complemented by an in-house plastics injection moulding facility with shot weights up to 250 g, its own toolmaking operation, and encapsulation systems for vacuum and atmospheric-pressure potting with epoxy and polyurethane resins. In addition, the company offers module assembly, final assembly of subassemblies, development and prototype construction, as well as support with certifications (VDE, TÜV, UL). ATEX-approved transformers of the KLF-Ex series provide galvanic isolation for intrinsically safe circuits in hazardous areas. Production takes place at the headquarters in Johanniskirchen as well as at sites in Austria and Poland.
- Site
- Johanniskirchen
- Processes
- Transformer manufacturing (single- and multi-phase mains transformers, 50 Hz), DC power supplies / direct current power units, Inductor manufacturing (coils, chokes, transformers, transducers, high-frequency components), Plastic injection moulding, Toolmaking (injection moulds: development, CAD design, hardening, final adjustment), Contract potting (vacuum and atmospheric-pressure potting, casting into housings, potting with, Module assembly (transformer plus application-specific electronic circuit), Final assembly of electronic components and subassemblies
- Materials
- Polyamide 6 GF30, Ultramid A3x2G5, Luran S, Terblend ABS, Makrolon, Epoxy resin, Polyurethane resin, Copper enamelled wire
- Certificates
- DIN EN ISO 9001:2015, ATEX QA certificate (Directive 2014/34/EU, Module D/E), UL component approval, DIN EN ISO 9001:2015 (TÜV Süd), ATEX QA certificate (2014/34/EU, Module D/E), UL component approval E466710 · E125651, RoHS / REACH compliance
- Founded
- 1979
- Employees
- 50
- Industries
- Electronics/Electrical engineering, Hazardous areas (ATEX), Beekeeping equipment, Beekeeping equipment (comb foundation embedding iron)
- 01
Development / prototype construction
- 02
Toolmaking
- 03
Winding of coils and transformers
- 04
Plastic injection moulding (housings, bobbins)
- 05
Encapsulation (vacuum / atmospheric pressure)
- 06
Module assembly / final assembly
- 07
Piece-by-piece testing prior to shipping
Materials & Processes
Polyamide 6 GF30
Glass-fibre-reinforced thermoplastic for stressed injection-moulded parts such as bobbins and housings.
Ultramid A3x2G5
Polyamide injection-moulding material for custom plastic parts.
Luran S
ASA material for injection-moulded parts depending on the area of application.
Terblend ABS
ABS blend material for individually coloured moulded parts.
Makrolon
Polycarbonate for injection-moulded parts with individual requirements.
Epoxy resin
Common potting material for transformers and electronic components.
Polyurethane resin
Potting material depending on the application, also with special resin-hardener systems.
Copper enamelled wire
Base material for the windings of coils, chokes and transformers.
Locations
Johanniskirchen
DEHeadquarters / Production
- Part weight / size
- Shot weight up to 250 g
- Lot size
- from 1,000 pieces/year (injection moulding, project-related)
- Materials
- Plastics (PA6 GF30, Luran S, Makrolon, among others), epoxy/polyurethane resins
- 6 injection moulding machines with clamping forces up to 95 t
- Encapsulation systems (vacuum or atmospheric pressure)
- Toolmaking with CAD design
Ostermiething
ATManufacturing site (acquired from Frauscher 2009)
Polen (ehem. Ulmer Transformatoren GmbH)
PLManufacturing site (acquired 2020)
Components & Products
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Transformer manufacturing (single- and multi-phase mains transformers, 50 Hz)Assembly | – | – | – | up to 15 kVA power | – |
| DC power supplies / direct current power unitsAssembly | – | – | – | up to 500 W | – |
| Inductor manufacturing (coils, chokes, transformers, transducers, high-frequency components)Assembly | – | – | – | – | Copper enamelled wire |
| Plastic injection mouldingPlastics | – | – | 250 g shot weight | from 1,000 pieces/year (project-related) | Polyamide 6 GF30, Ultramid A3x2G5, Luran S, Terblend ABS, Makrolon |
| Toolmaking (injection moulds: development, CAD design, hardening, final adjustment)Engineering | – | – | – | – | – |
| Contract potting (vacuum and atmospheric-pressure potting, casting into housings, potting withSurface | – | – | – | – | Epoxy resins, Polyurethane resins, special resin-hardener systems on request |
| Module assembly (transformer plus application-specific electronic circuit)Assembly | – | – | – | – | – |
| Final assembly of electronic components and subassembliesAssembly | – | – | – | – | – |
| ATEX transformers (KLF-Ex series, galvanic isolation of intrinsically safe circuits)Assembly | – | – | – | – | – |
2 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Injection moulding machines | – | 6 | Clamping forces up to 95 t | – | Johanniskirchen |
| Encapsulation systems (vacuum or atmospheric pressure) | – | – | – | – | Johanniskirchen |
Additional services
Quality & Certification
The quality management system is regularly audited to DIN EN ISO 9001:2015 by TÜV Süd. Every wound component is tested piece by piece before shipping; shop-floor data collection, file management and the 5S method support process optimisation.
| Evidence | Johanniskirchen |
|---|---|
| DIN EN ISO 9001:2015 (TÜV Süd) | |
| ATEX QA certificate (2014/34/EU, Module D/E) | |
| UL component approval E466710 · E125651 | |
| RoHS / REACH compliance |
History
- 1979
Founded by Karl Weiss in Oberham as a manufacturer of transformers serving customers in Germany and Austria.
- 1989
Production relocated to Johanniskirchen; integration of the plastics engineering and toolmaking departments.
- 2005
The company becomes part of STEMAS AG and expands its customer base.
- 2009
Acquisition of Frauscher in Ostermiething (Austria) – expansion of the inductive components business.
- 2012
Acquisition of BHR-Elektronik with a significant increase in the share of inductors.
- 2014
Acquisition of Schaffer GmbH & Co. KG: ATEX transformers, PCB transformers, special coils; 50 employees at the Johanniskirchen site.
- 2017
Launch of the online shop, development of the comb foundation embedding iron and establishment of the modules business area.
- 2020
Acquisition of the intangible assets and the Polish manufacturing site of Ulmer Transformatoren GmbH.