
Develops and produces full-wave soft starters (VSA) for air-conditioning compressors and heat pumps.
Weigel AG
Wattwil (SG) · headquarters with development, production and salesNew on Amplifa
About Weigel AG
Weigel AG is a Swiss family-owned company based in Wattwil in the Toggenburg region (canton of St. Gallen) that has been working with electronic devices since 1980. Its core product is the patented full-wave soft starter VSA for air-conditioning compressors, which is based on analog NTC technology and enables a sinusoidal, harmonics-free starting current without phase-angle control. The company covers the entire value chain from development through electronics assembly to 100% final inspection; repairs and tests are carried out exclusively in its own laboratory. The entire VSA product line is ready for dispatch within 24 hours. Customers are heat pump and air-conditioning technology manufacturers in Switzerland, Germany, the entire EU and worldwide; in addition, customer-specific solutions with a free feasibility study are offered. Since 2016, Christoph Weigel has been leading the company in its second generation.
- Site
- Wattwil
- Processes
- Development of electronic devices (Engineering by Design, customer-specific solutions), Production of full-wave soft starters (VSA) for air-conditioning compressors (electronics assembly,, 100% testing of all devices and incoming inspection of components (quality control), Repairs, tests and quality inspections of electronic devices in the company's own laboratory (spare, Manufacture of three-phase full-wave soft starter VSA (patent 1986), Manufacture of single-phase full-wave soft starter VSA (patent 2000), Replacement and successor products for older models, Spare parts and repairs (exclusively in the company's own laboratory)
- Materials
- Tin, Tantalum, Tungsten, Gold, NTC resistors (temperature-dependent ohmic resistors), Tantalum capacitors, Soldering agents / tin finishes (solder, tin finishes), VDR resistors and thermal fuses
- Certificates
- ISO 9001:2015, REACH Regulation (EC) No. 1907/2006, RoHS Directive (2011/65/EU, amended by (EU) 2015/863), POP Regulation (EU) 2019/1021, TSCA (USA), California Proposition 65, CMRT (Conflict Minerals Reporting Template, Rev. 6.5), REACH / RoHS / POP / TSCA / CP65 compliance, CMRT (conflict minerals, Rev. 6.5)
- Founded
- 1980
- Industries
- Air-conditioning technology, Heat pumps, Refrigeration technology, Energy sector
- 01
Engineering / customer-specific development
- 02
Incoming inspection of components
- 03
Electronics assembly (assembly)
- 04
100% final inspection of all devices
- 05
Sales and shipping from stock
- 06
Service, repairs and tests in the company's own laboratory
Materials & Components
NTC resistors (temperature-dependent ohmic resistors)
Core of the NTC technology; at switch-on it reduces the terminal voltage at the compressor and enables a harmonics-free start-up.
VDR resistors and thermal fuses
Protect the VRT device generation against transient overvoltages (Burst EN 61000-4-4, Surge EN 61000-4-5).
Tin, tantalum, tungsten, gold
Conflict minerals in components such as tantalum capacitors and tin finishes, sourced from suppliers with RMAP-validated smelters in accordance with the CMRT.
Site

Wattwil
CHHeadquarters: development, production (electronics assembly), quality control, laboratory, sales
- Materials
- NTC resistors, VDR resistors, thermal fuses, tantalum capacitors, tin finishes
- Own laboratory for repairs, tests and quality inspections
Products & Components



Inside the production




Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Development of electronic devices (Engineering by Design, customer-specific solutions)Engineering | – | – | – | – | – |
| Production of full-wave soft starters (VSA) for air-conditioning compressors (electronics assembly,Assembly | – | – | – | – | Tin, Tantalum, Tungsten, Gold |
| 100% testing of all devices and incoming inspection of components (quality control)Testing | – | – | – | – | – |
| Repairs, tests and quality inspections of electronic devices in the company's own laboratory (spareTesting | – | – | – | – | – |
| Manufacture of three-phase full-wave soft starter VSA (patent 1986)Assembly | – | – | – | – | – |
| Manufacture of single-phase full-wave soft starter VSA (patent 2000)Assembly | – | – | – | – | – |
Additional services
Quality & Certification
Strict incoming inspection of all components as well as 100% testing of all devices, including NTC retests. All repairs, tests and quality inspections are carried out exclusively in the company's own laboratory in Wattwil.
| Evidence | Wattwil |
|---|---|
| ISO 9001:2015 | |
| REACH / RoHS / POP / TSCA / CP65 compliance | |
| CMRT (conflict minerals, Rev. 6.5) |
History
- 1980
Founding of R. Weigel Elektronik in Neu St. Johann by Roland Weigel; projects with companies such as Hemair, Menerga and Mani + Fink.
- 1985
Design of heat pump heat-recovery controls and heat pump controls for systems such as Resolair.
- 1986
Patenting of the three-phase full-wave soft starter VSA.
- 2000
Patenting of the single-phase full-wave soft starter VSA.
- 2004
Renaming of R. Weigel Elektronik to Weigel Elektronik AG.
- 2011
First certification according to ISO 9001:2008.
- 2014
Further development of VRT with VDR resistors and thermal fuses for protection against transient overvoltages.
- 2016
Generational change: Christoph Weigel takes over the management.
- 2017
Renaming of Weigel Elektronik AG to Weigel AG.
- 2020
Development of the new soft starter generation WaveStart (WS).