SCiBreak is hiring!

2020 is a big year for SCiBreak. We have started our first major customer project, providing grid protection for the Swedish Transport Administration, and we will also develop medium voltage DC switchgear as part of an upcoming EU research project. With our growing commitments ahead, our team needs to be expanded.

We are currently looking for a development engineer, a Swedish-speaking senior development engineer, and a summer intern. To see more, go the Careers section

SCiBreak wins order from Trafikverket

SCiBreak has been selected by Trafikverket (the Swedish Transport Administration) to develop and supply equipment for the Swedish rail network. Swedish railways are seeing increasing passenger streams, resulting in a need for more traffic. The power supply system needs to be upgraded, but this often leads to excessive short-circuit currents in case of faults, which are damaging, and therefore are not allowed. SCiBreak will provide ultra-fast circuit breakers that can interrupt fault currents before damage is done.

“The technology provided by SCiBreak can enable us at Trafikverket to upgrade the railway power supply network at low cost as well as to avoid damage to equipment and distortions to rail traffic”, says Mårten Eklund, project leader at Trafikverket.

“We are proud of the confidence shown in us and our technology, by Trafikverket,  and we will do our best to meet their expectations”, says Staffan Norrga, CEO of SCiBreak.

The total order sum is 38 MSEK which includes development work, delivery and commissioning of ten circuit breakers.

For more information, contact Staffan Norrga (070-5601584,


SCiBreak AB is a Swedish company founded in 2014 to commercialize new technology for interrupting electric current. Our unique and patented technology allows users to protect electric power systems against short-circuit faults at minimum cost. We are located in Järfälla outside Stockholm, and our roots are with the KTH Royal Institute of Technology in Stockholm. We have been supported by Innoenergy during our development.

LimBreak-Rail: New EUREKA-project together with Arcteq Oy on ultra-fast fault detection in railway applications

A bidirectional, ultra-fast DC-breaker, such as the breaker technology offered by SCiBreak, can with great benefits be used also in AC-systems. Especially in 16.7 Hz railway applications, the ability to dramatically reduce the total fault clearance time brings a unique and valuable tool to the grid owners.

The requirements on and possibilities enabled by a fast-acting fault detection system will be investigated in the form of a EUREKA-project called LimBreak-Rail.

LimBreak-Rail partners

The project will be carried out as a collaboration together with the innovative Finnish SME Arcteq, which develops detection systems for both 50 Hz and 16.7 Hz applications. A fault detection system will, as a part of the project, be demonstrated and tested in the grid of the Swedish national railway operator, Trafikverket.


SCiBreak’s DCCB module tested at KEMA

During last week, SCiBreak AB tested a DC circuit breaker module prototype at the KEMA laboratories of DNV GL, as a task within the EU-project PROMOTioN. A fault current of 10.8 kA was delivered by short circuit generators and was interrupted against a transient voltage exceeding 40 kV.

These tests verify the function of the developed technology and constitute a major milestone for SCiBreak. The fault current was interrupted, and the corresponding energy of 0.6 MJ was dissipated in surge arresters included in the module. An artificial zero-crossing was created in the vacuum interrupter by an oscillating current excited by a power electronic converter. An ultra-fast Thomson coil actuator created the necessary contact separation in less than 3.5 milliseconds after the trip order was received by the DCCB module.

The photo below shows the tested module surrounded by engineers from KEMA Laboratories and SCiBreak.

Concept proved for 10 kA and 40 kV

SCiBreak got some good news for Christmas, a significant milestone was reached. For the first time, a 10 kA current was interrupted against a recovery voltage of 40 kV with SCiBreak’s technology. After ramping up the ratings of the prototype during the whole year of 2017, we thus reached our initial target.

The current was successfully commutated to the energy absorption branch within 3 ms after the trip order was given to the circuit breaker. This was achieved thanks to the ultra-fast main interrupter which is operated with our Thomson-coil actuator.

In the picture below, the measured resonant current reaches the same value as the fault line current at 800 us. At that moment, the arc is extinguished and the voltage across the breaker increases to a voltage level of nearly 40 kV.

These current and voltage levels correspond to the test that will be performed at the KEMA laboratory next june. To be continued!

Entry into PROMOTioN

SCiBreak has been accepted as a partner in the PROMOTioN project, which is part of the EU-financed Horizon 2020 program. The project seeks to develop meshed HVDC offshore grids on the basis of cost-effective and reliable technological innovation. It gathers more than 30 partners among manufacturers, TSOs, consultants and academia and has a budget of more than 50 MEUR.

SCiBreak will contribute in several ways to the project.

SCiBreak moves into new facilities

SciBreak is moving into new facilities in Kallhäll north of Stockholm. The new facilities comprise 100 m2 in the ground floor for test setup and workshop and 100 m2 office is available on the upper floor.

Project HIBREAK started

SCiBreak will,together with the Swedish TSO Svenska Kraftnät and the Belgian university KU Leuven, carry out  a development project — HIBREAK — to develop and verify a high-speed DC circuit breaker module for 40 kV, 10 kA with operation time below 5 ms. The project runs during 2017-2018 and includes testing for Proof Of Concept for validation of SCiBreak’s DC circuit breaker technology.

The project will be funded by Innoenergy, the Swedish Energy Agency and Svenska Kraftnät.