Electrical planning with passion. Our company accompanies you from the planning of complex technical systems and installations to commissioning. We are happy to pass on our expertise to you. In an all-round carefree package that guarantees quality. Our services related to building electrical engineering Are you looking for a competent partner in building electrical engineering? Whether new construction, conversion or renovation - we advise you individually and purposefully. We accompany you and your project from A to B and beyond. From the preliminary project to the tender to operation. Together with you we plan your project, monitor deadlines and budget. On request, we will be happy to take over the coordination of the specialist construction or the management of the building owner. We live electrical engineering - and understand planning, building and management as a holistic process. As an independent engineering office, we offer individual consulting and planning services for electrotechnical building equipment. Our offer is particularly suitable for builders, investors, general planners and architects in the following sectors: Chemistry, pharmaceuticals, biotechnology Banks, Insurance, Telecom, Services Private and public administrations industrial and commercial buildings data center What we do: high-voltage systems Medium voltage systems, transformer stations low-voltage distribution systems Emergency power supply systems, backup power systems and UPS systems substation control systems busbar and cable systems Power installations, installation systems Lighting installations, lighting controls low-voltage installations Audio and visual systems Room controls and bus systems Communication systems (image, data, voice) IT, WAN- LAN systems Security systems (fire, value protection and intrusion) Lightning protection and EMC Specialist site management for technical building equipment The TGA specialist construction management ensures that the process and building technology systems are implemented according to the specifications of the planner by the executing contractors and installers. To ensure the overall function, we carry out an integrated test. This enables us to show the interactions between the various trades, systems and system parts and to rectify any defects immediately. I

Based in Sarmenstorf, Switzerland, Retrotec is your reliable partner for custom technology solutions. From electrical engineering and IT networks to control systems and electronics, we bring your visions to life. With Swiss precision, extensive experience, and state-of-the-art technology, we deliver the highest quality standards to realize your projects efficiently and sustainably. Electrical Engineering: Tailored Solutions for Industrial Applications Retrotec provides bespoke control systems, energy management solutions, and custom machinery and prototypes. • Energy Efficiency & Security: Optimize your systems for sustainable energy use and transition to renewable resources with our expertise. • Custom Control Systems: Unique solutions designed to meet your specific needs, ensuring flexibility and operational excellence. Let us transform your challenges into solutions, from concept to commissioning. Electronics: Repair, Optimize, Innovate From developing innovative prototypes to restoring older systems, Retrotec offers comprehensive electronic services. • Retrofit: Modernize existing machines for enhanced performance and sustainability – an affordable alternative to new purchases. • Prototyping: Bring your product ideas to life with precision and attention to detail. • Repairs: Our extensive component inventory and reverse engineering expertise enable us to restore nearly any device. At Retrotec, innovation and sustainability are at the core of everything we do. Control Systems & Machinery: Custom-Made for Your Business Retrotec specializes in building customized machinery and control systems tailored to your exact requirements. • Specialized Solutions: From small series production to fully customized designs, we deliver what your business needs. • Industrialization Support: Transition smoothly from prototype to mass production with our expertise. Our mission is to exceed your expectations with intelligent engineering and top-tier quality. IT & Networks: High-End Technology for Maximum Performance In today’s digital age, Retrotec is your trusted partner for secure and high-performance IT and network solutions. • Data Centers: Efficient, scalable server rooms designed for maximum uptime and reduced operational costs. • Network Infrastructure: High-performance solutions featuring the latest hardware and connectivity technologies. • Cybersecurity: Safeguard your data with firewalls, VPNs, two-factor authentication, and more. Boost productivity, security, and speed with IT solutions designed by Retrotec. Why Choose Retrotec? • Swiss Quality: All our development, design, and manufacturing is proudly Swiss-made, ensuring precision and durability. • Sustainability: We prioritize eco-friendly processes and resource-efficient solutions. • Customer Focus: From initial consultation to delivery, our dedicated team supports you every step of the way. Start your next project with us! Visit our website at www.retrotec.ch to learn more about our services and capabilities.

Electro H. Frei AG – Your Partner for Electrical Installations in Aargau Electro H. Frei AG is a premier company in the electrical industry with three locations in Hunzenschwil , Birr , and Auenstein . We provide comprehensive electrical services across the entire Aargau region, distinguished by our highly skilled employees, cutting-edge technology, and tailored solutions. Our Services Custom Electrical Concepts : At Electro H. Frei AG, we develop customized electrical concepts designed to perfectly meet your needs. Whether for commercial buildings or residential properties, we offer innovative and efficient solutions that adhere to the highest safety standards. Professional Electrical Installations : Our experienced electricians ensure precise and professional installation of all electrical systems. From home installations to industrial setups and smart home systems, we provide a full range of services under one roof. High-Quality Industrial Service : We place great emphasis on providing excellent industrial services. Our team ensures the smooth operation of your industrial equipment through regular maintenance and prompt repairs, minimizing downtime and ensuring continuous operational readiness. Electrical Engineering Consulting : Our expert team offers comprehensive consulting in all areas of electrical engineering. We assess your needs and provide tailored solutions that are both economically and technically optimal. Maintenance and Support for Electrical Systems : In addition to installation, we offer extensive maintenance and support for your electrical systems and equipment. Our services include regular inspections, preventive maintenance, and rapid response times for any issues or failures. Why Choose Electro H. Frei AG? • Experience and Expertise : With years of experience and extensive technical knowledge, we are your reliable partner for all electrical engineering needs. • Proximity to Clients : With locations in Hunzenschwil, Birr, and Auenstein, we are always close to you and can quickly respond to your requirements. • Quality and Reliability : We use high-quality materials and modern technology to provide durable and safe solutions. • Tailored Consulting : Our customized electrical concepts and solutions are precisely tailored to your specific needs. Contact us for personalized advice or a no-obligation quote. Visit us at one of our locations in Hunzenschwil , Birr , or Auenstein and discover how Electro H. Frei AG can handle your projects in Aargau with the utmost professionalism and expertise. We look forward to assisting you.