Siemens Smart Infrastructure has unveiled a new end-to-end portfolio of direct current (DC) protection and switching solutions, reinforcing its push into next-generation power distribution and industrial electrification.
The launch includes the SENTRON 3QD2 semiconductor circuit breaker and the SIRIUS 3RF5 solid-state switching device, both designed to support fast-growing demand for efficient, low-loss DC-based systems in data centers, AI-driven facilities, production plants, battery storage, and renewable energy integration.
The solutions are engineered for integration into systems such as the SIVACON S8 low-voltage switchboard and SIVACON 8PS busbar trunking systems.
The shift from alternating current (AC) to DC is central to the energy transition, driven by renewables like photovoltaics and battery storage, which inherently generate and store DC power. By cutting conversion losses and enabling more direct integration of renewables, Siemens says DC systems can significantly improve efficiency and sustainability in modern grids.
At the core of the new portfolio is the SENTRON 3QD2, which uses semiconductor technology and intelligent protection algorithms to interrupt short circuits in microseconds—up to 1,000 times faster than conventional systems.
Siemens says this leap is critical for stable DC grids and higher system availability.
“With the consistent development of our pioneering semiconductor switching technology, we enable a new level of electrical safety also for the DC era,” said Andreas Matthé, CEO of Electrical Products at Siemens.
The device integrates protection, switching, monitoring, and energy management in a compact unit, reducing component count and space requirements. With no mechanical wear parts, it is designed for maintenance-free operation and high uptime in critical infrastructure.
“Our new DC portfolio equips customers with innovative solutions that not only enhance energy efficiency but also enable them to build a more resilient, future-ready infrastructure. This is a crucial contribution to the decarbonization of our industries and a testament to our commitment to creating technologies with purpose," Andreas Matthé added.
Alongside it, the SIRIUS 3RF5 solid-state switching device brings high-frequency DC switching for resistive loads, improving durability and reducing wear in industrial environments. It also carries the Siemens EcoTech Label, signaling a focus on sustainable product design.
Together with SIVACON systems and integrated DC architectures, Siemens says the portfolio enables major gains in efficiency, reliability, and material savings. In industrial applications such as robotics-heavy manufacturing, DC-based energy recovery and storage could cut peak power demand by up to 80%, while reducing copper usage by up to 50%.
