Door communication and building communication systems, developed and manufactured in Furtwangen in the Black Forest
S. Siedle & Söhne Telefon- und Telegrafenwerke OHG
Furtwangen (DE) · Muttenz (CH) · Kontich (BE) · Hvidovre (DK)New on Amplifa
About Siedle
S. Siedle & Söhne is one of Europe's leading manufacturers of door communication and building communication systems. The family-owned company, headquartered in Furtwangen in the Black Forest, develops, manufactures and integrates systems for communication at and inside buildings: door bells, door intercom systems, video intercom systems, IP systems, access control and mailbox systems. Manufacturing takes place entirely at the headquarters; more than 80 percent of value creation is generated in-house, supported by digitally controlled production machines as well as an in-house printed circuit board production in which certified Fairtrade tin is processed. The electromagnetic compatibility of the devices is tested in the company's own Siedle Testlab according to industrial standards. The systems are used worldwide in residential buildings, companies, clinics, concert halls and museums. The portfolio is complemented by system planning, remote maintenance, repair service and cloud-based building management solutions (Vixinity Cloud).
- Site
- Furtwangen
- Processes
- Foundry (historical: casting of bells and clock parts), Electronics manufacturing: in-house production of printed circuit boards (installed in door, Series and one-off production with digitally controlled production machines, Electromagnetic compatibility testing (EMC) according to industrial standards incl. high-frequency, Lettering service for door stations and mailboxes (weatherproof, moisture-resistant), Access control, Mailbox systems, System planning and quotation preparation
- Materials
- Tin (soldering tin, Fairtin – certified Fairtrade tin from Peru), Fairtin – certified Fairtrade tin from Peru, EMC and high-frequency testing (Siedle Testlab), Printed circuit board production, Lettering service
- Certificates
- DIN EN ISO 9001, DIN EN ISO 14001, ISO 9001, ISO 14001
- Founded
- 1750
- Employees
- 450
- Industries
- Building communication, Residential construction (small and large residential complexes), Commercial/companies, Clinics, Culture (concert halls, museums), Electrical trade
- 01
Development and design
- 02
Printed circuit board production (in-house manufacturing)
- 03
Digitally controlled series and one-off production
- 04
Assembly
- 05
EMC and high-frequency testing (Siedle Testlab)
- 06
Lettering service
- 07
Warehouse and logistics (high-bay warehouse, automated small-parts warehouse)
- 08
System planning, service and remote maintenance
Materials and processes
Fairtin – certified Fairtrade tin from Peru
Soldering tin for the in-house manufactured printed circuit boards in door stations, indoor stations and power supplies; more than half a tonne in annual turnover.
EMC and high-frequency testing (Siedle Testlab)
Own testing laboratory for testing electromagnetic compatibility according to industrial standards, with high-frequency testing since 2024.
Printed circuit board production
In-house production of printed circuit boards for door stations, indoor stations and power supplies.
Lettering service
Weatherproof, moisture-resistant lettering for door stations and mailboxes.
Locations
Furtwangen
DEHeadquarters, development, production, logistics
- Lot size
- One-off and series production
- Materials
- Metal, plastic, electronics (soldering tin Fairtin)
- High-bay warehouse / logistics centre (1995)
- Automated small-parts warehouse (2021)
- Siedle Testlab – EMC and high-frequency testing (2024)
- Photovoltaic system 500 m² (2025)
- Digitally controlled production machines
Systems and components
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Foundry (historical: casting of bells and clock parts)Casting | – | – | – | – | – |
| Electronics manufacturing: in-house production of printed circuit boards (installed in doorJoining | – | – | – | – | Soldering tin (Fairtin, Fairtrade tin from Peru) |
| Series and one-off production with digitally controlled production machinesAssembly | – | – | – | – | – |
| Electromagnetic compatibility testing (EMC) according to industrial standards incl. high-frequencyTesting | – | – | – | – | – |
| Lettering service for door stations and mailboxes (weatherproof, moisture-resistant)Surface | – | – | – | – | – |
4 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| High-bay warehouse / logistics centre | – | – | – | 1995 | Furtwangen |
| Automated small-parts warehouse | – | – | – | 2021 | Furtwangen |
| EMC testing laboratory (Siedle Testlab) with high-frequency testing | – | – | – | 2024 | Furtwangen |
| Photovoltaic system | – | 1 | 500 m² | 2025 | Furtwangen |
Additional services
Reference customers
Quality and certification
Siedle works with certified management systems for quality (DIN EN ISO 9001) and environment (DIN EN 14001), which are regularly reviewed by independent auditors. The electromagnetic compatibility of the devices is tested in the company's own Siedle Testlab according to industrial standards.
| Evidence | Furtwangen | Muttenz | Kontich | Hvidovre |
|---|---|---|---|---|
| ISO 9001 | ||||
| ISO 14001 |
History
- 1750
Beginnings as a bell foundry of Matthäus Siedle at the Oberbregenbachhof near Furtwangen
- 1870
Salomon Siedle II founds a factory in Furtwangen (industrialisation)
- 1887
Production of the first telephones
- 1900
Growth of the factory, first steam engine
- 1935
Portavox, the first door loudspeaker
- 1953
Reconstruction after a major fire that destroyed almost all factory buildings
- 1970
Horst Siedle becomes managing director
- 1972
Video-Portavox, first video door surveillance system on the German market
- 1975
HT 311, first system telephone with key modules
- 1981
Siedle Vario 511, first modular door intercom system
- 1986
Siedle Multi, high-performance system for complex applications
- 1995
Logistics centre and high-bay warehouse go into operation
- 1998
Siedle Vario 611, versatile modular system
- 2000
Siedle Steel, custom-made high-end systems; transfer of the corporate group into a family foundation
- 2012
Entry into the digital world: IP system Siedle Access and Siedle App
- 2021
Investment in a new automated small-parts warehouse
- 2024
Expansion to the Siedle Testlab (EMC and high-frequency testing)
- 2025
New 500 m² photovoltaic system goes into operation; approx. 10 % of electricity demand
- 2026
News campaign "Enter"; opening of the art museum in Furtwangen planned