power electronics
and power supply
for 75 years!

We are celebrating our company anniversary! Gustav Klein has been supplying power supply devices and systems for 75 years. The know-how and experience of our qualified employees offer you reliability and competence in solving your specific requirements. The continuous development of our product portfolios will ensure that truly secure systems will continue to be available in the future.

NEW: Infeed Test System
up 1200 V & 1200 A

Testing and simulation

For electromobility, development and industry

To test batteries, fuel cells, e-drive trains and other components, we offer uni- and bidirectional power supply solutions. A clear design, reliable components and easy maintenance characterize our source/sink systems.

Highly available power supply

For industry, hospital and railway

For more than seven decades, Gustav Klein has been your reliable partner for a safe power supply – from consulting and planning to implementation, commissioning and service. Maximum service life and ease of servicing are the hallmarks of our systems.

Technology, competence, reliability, quality & innovation

Your partner for
power supply - worldwide.

Technology, competence, reliability, quality & innovation

Always stay up to date

Unser kostenloser Newsletter informiert Sie regelmäßig per E-Mail über interessante Themen und bevorstehende Termine.

We are a long-term partner

Our exclusive service

We do not only want to deliver our systems, but also to accompany them. With our extensive range of services, we are always happy to assist you and offer you tailor-made solutions specifically to your requirements.


We offer customised maintenance contracts and maintenance concepts for your systems.

System replacement

We help you renew your power supply.

24h hotline

We are available for you around the clock.

Material exchange

Wear parts or ageing components should be replaced at certain intervals.

News, press and more

We go forward - more
news from Gustav Klein

IHK graduation spring 2024

We are proud of you! We would like to congratulate our four former trainees on passing their final exams as office management assistants and our electronics technicians for devices and systems. In spring 2024, for the 11th time in a row, at least one of our trainees passed the exam with an A. We are […]

Exceptional service, recognised by our customers!

In 2023, we once again received top customer feedback on our service: With a score of 1.06, we can proudly say that our service is excellent. 💡 What characterises our service? Qualified and dedicated service staff: Our employees have in-depth training and a genuine passion for our customers and products wide range of services: From […]

Now available: The proven test system with up to 1200 V & 1200 A

Infeed Test System up to 1200 V / 1200 A I-TS-3870: Single-channel system MI-TS-3871: Multi-channel system Outstanding properties and a wide range of design variants: • Various input voltages • Highest safety standards • Simple integration through various interfaces • Many other options available e.g. insulation monitoring, battery simulator / battery tester switchable and much more […]

Join our team!

For over 75 years, the medium-sized family business Gustav Klein has been developing and manufacturing reliable solutions in the field of power supply as well as test / simulation systems for e-mobility in Schongau and Inzing.