High-voltage power supplies

Insulation is a very important aspect for high voltage applications. Be it sufficient functional insulation so that the system is available without problems in the long term, or safety-relevant insulation to prevent damage to users, machines and the environment.

In these applications, various auxiliary voltages are usually required to supply gate drivers, measurement technology or other electronics. The reference point for these voltages is often not at ground potential, but at a high or even switched voltage. Our highly insulating power supplies are designed to be able to safely transmit and provide these auxiliary voltages.

With insulation values from 15kV to 80kV (AC partial discharge-free) and output powers from 5W to 300W, our product range covers a large number of possible applications.

At Siebel Elektronik, we focus on the manufacture of specialized high-voltage power supplies that are tailored to the demanding requirements of medium-voltage and high-voltage technology. Our high-insulation power supplies have been used in power plants, substations and offshore wind turbines around the world for over 20 years.

With our commitment to innovation and reliability, our products ensure smooth operation and optimal performance for efficient operation of every medium-voltage converter.

Advantages of our high-voltage power supplies:

  • High insulation strength: With a focus on the development of the insulation distance, we achieve the highest insulation voltages in the world for auxiliary power supply devices. Due to our focus on the long-term stability of the insulation, our basic assessment of the dielectric strength always applies to partial discharge-free operation. Even with thousands of devices that have been in use around the world for decades, we have not yet received any reports of insulation failure.
  • Reliability: Our power supplies are further developed with many years of experience and subjected to rigorous quality tests in order to offer high reliability even in the most demanding environments. Thanks to their robust construction and advanced technology, they can withstand high temperatures, vibrations and the highest insulation requirements and ensure continuous operation without compromise.
  • Customization options: We are aware of the diverse requirements of our customers and offer customizable solutions tailored to specific applications and operational requirements. From voltage and current specifications to form factors and interfaces, we work closely with our customers to develop tailor-made solutions that perfectly match their requirements.
  • Comprehensive support: At Siebel Elektronik, customer satisfaction is our top priority. In addition to our products, we offer comprehensive technical support during integration and the entire product life cycle. Our dedicated team of experts is happy to accept your inquiries and work with you to develop the optimal solution.
  • Future-proof technology: Due to the increasing integration of renewable energies, the world's energy supply networks are changing. The need for power electronics in the medium-voltage and high-voltage range is increasing for stabilization and energy conversion. Our products are already designed for these requirements and represent a key component for applications in this area.


Of course, we will also advise you on additional or special developments according to your desired criteria and specifications and manufacture the highly insulating energy supply solution that is right for you.
Do not hesitate to contact us, we will be happy to advise you.

For integration of our products into already existing installations or scheduled concepts we offer you competent assistance and solutions. Please see also our further information for » Application support

DU15-15G

Number of channels: 1
Input current: 10 A AC (30-100 kHz)
Output voltage: 15 V DC (+/-0.5V)
Output power: 6 W
Insulation voltage: 15 kV AC partial discharge (PD)-free
Data sheet: Download data sheet

DU15-24G

Number of channels: 1
Input current: 10 A AC (30-100 kHz)
Output voltage: 24 V DC (+/-0.5V)
Output power: 6 W
Insulation voltage: 15 kV AC partial discharge (PD)-free
Data sheet: Download data sheet

DU20-15G

Number of channels: 1
Input current: 10 A AC (50-100 kHz)
Output voltage: 15 V DC (+/-0.5V)
Output power: 5 W
Insulation voltage: 20 kV AC partial discharge (PD)-free
Data sheet: Download data sheet

DU20-24G

Number of channels: 1
Input current: 10 A AC (50-100 kHz)
Output voltage: 24 V DC (+/-0.5V)
Output power: 5 W
Insulation voltage: 20 kV AC partial discharge (PD)-free
Data sheet: Download data sheet

SW15-25G

Number of channels: 1
Input voltage: 24 V DC
Output voltage: 25 V DC (+/-1.0 V)
Output power: 25 W
Insulation voltage: 15 kV AC partial discharge (PD)-free
Data sheet: Download data sheet

SW32-24D35U

Number of channels: 1
Input voltage: 24 V DC
Output voltage: 35 V DC 35 V AC (70 kHz)
Output power: 80 W
Insulation voltage: 32 kV AC partial discharge (PD)-free
Data sheet: Download data sheet

SW32-24D10A

Number of channels: 1
Input voltage: 24 V DC
Output current: 10 A AC (70 kHz)
Output power: 80 W
Insulation voltage: 32 kV AC partial discharge (PD)-free
Data sheet: Download data sheet

SW50-24D10A

Number of channels: 1
Input voltage: 24 V DC
Output current: 10 A AC (70 kHz)
Output power: 80 W
Insulation voltage: 50 kV AC partial discharge (PD)-free
Data sheet: Download data sheet

GIS18-35AD

Number of channels: 4
Input voltage: 150 - 250 V AC or DC
Output voltage: 35 V DC 35 V AC (70 kHz)
Output power: 300 W (max. 150 W p. Kanal)
Insulation voltage: 18 kV AC partial discharge (PD)-free
Data sheet: Download data sheet

GIS18-24V-35AD

Number of channels: 4
Input voltage: 24 V DC
Output voltage: 35 V DC 35 V AC (70 kHz)
Output power: 300 W (max. 150 W p. Kanal)
Insulation voltage: 18 kV AC partial discharge (PD)-free
Data sheet: Download data sheet

GIS40-35AD

Number of channels: 4
Input voltage: 150 - 250 V AC or DC
Output voltage: 35 V DC 35 V AC (70 kHz)
Output power: 280 W (max. 120 W p. Kanal)
Insulation voltage: 40 kV AC partial discharge (PD)-free
Data sheet: Download data sheet

GIS80-24AD

Number of channels: 4
Input voltage: 150 - 250 V AC or DC
Output voltage: 24 V DC 24 V AC (70 kHz)
Output power: 400 W (max. 100 W p. Kanal)
Insulation voltage: 80 kV AC partial discharge (PD)-free
Data sheet: Download data sheet

HSC30

Number of conductors: 1
Conductor cross-section: 2.5mm² (14 AWG) stranded copper
Outer diameter: 10 mm
Shield: none
Sheath material: polyurethane
Data sheet: Download data sheet

HSC30-2

Number of conductors: 2
Conductor cross-section: 1.0mm² (18 AWG) stranded copper
Outer diameter: 10 mm
Shield: braided copper
Sheath material: polyurethane
Data sheet: Download data sheet

Application support

For integration of our products into already existing installations or into a planned concept we offer competent support and are available for your questions.

Hereinafter we show some potential applications:

An output voltage of 35VDC with a power of 80W is suitable to supply an IGCT gate unit. With a GIS18 / GIS 40 up to four loads can be powered at the same time. To connect between supply and loads we recommend our HSC30 cable.

A current slope system consists of a supply device SW32-24D-10A and multiple DU15 decoupling units. The supply unit includes the first isolation barrier to the current slope. The slope itself is also isolated to the output voltage of the decoupling units. Each of these units can power its own load. Datasheet isolation values are only applicable in combination with HSC30 cable. For further information please look at our Application Note.

Some of our power supplies additionally provide an AC output voltage with a frequency of 70kHz. This can be used to feed one or more transformers for further potential separation.

For loads with less power consumption the smaller units SW15 and SW25 are an appropriate solution.