Siemens Smart Infrastructure has launched a comprehensive portfolio of direct current protection and switching solutions at Hanover Messe 2026. The new offering, including the Sentron 3QD2 semiconductor circuit breaker and the Sitius 3RF5 solid-state switching device, is designed to meet the growing demand for sustainable, efficient, and reliable low-voltage power distribution and industrial switching technology. Integrated in power distribution systems such as SIVACON S8 low-voltage switchboard and SIVACON 8PS busbar trunking systems, these solutions are particularly crucial for high-performance applications such as data centres, production facilities and battery storage systems, as well as for the integration of renewable energies.
The shift from widely used alternating current systems towards DC technology is a critical step in the global energy transition. Renewable energy sources like photovoltaics and battery storage systems generate or store electricity as direct current. By reducing DC to AC conversion losses and enabling the direct integration of renewable energy sources, DC systems offer a more efficient and sustainable alternative to traditional AC grids. Siemens is at the forefront of this transformation, particularly in its active participation in initiatives like the Open Direct Current Alliance (ODCA) and Current/OS.
A key innovation in the new portfolio is the Sentron 3QD2 semiconductor circuit breaker. Based on semiconductor technology and smart protection algorithms, it enables ultra-fast interruption of short circuits in the microsecond range, up to 1000 times faster than conventional systems, offering much greater protection for sensitive components. This is mandatory for DC grids and offers a significant increase of protection and system availability.
The new circuit breaker combines protection, switching, monitoring, and energy management in a single compact and multifunctional unit, says Siemens, replacing multiple components and saving significant space. Being maintenance-free with no mechanical wear parts, the Sentron 3QD2 offers a long service life and maximum plant availability, making it ideal for critical infrastructure.
Solid state switching
Complementing the Sentron 3QD2 is the new SIRIUS 3RF5 solid-state switching device, the first of its kind for DC applications. It is designed for high-frequency switching of resistive loads, offering a low wear and durable solution that enhances the efficiency and availability of industrial plants. The SIRIUS 3RF5 also carries the Siemens EcoTech Label, to emphasise its sustainable and transparent product design.
These products, together with the SIVACON S8 low-voltage switchboard (with Siemens EcoTech Label), SIVACON 8PS busbar trunking systems as well as integrated DC protection and switching devices, Siemens asserts that it is paving the way for new DC solutions, supporting a high level of reliability and efficiency in production or infrastructure.
The advantages of DC solutions extend beyond individual products. For example, in a manufacturing setting with the use of robots, applying DC technology combined with energy recuperation and storage can reduce peak power demand by up to 80 %. And DC systems eliminate the need for reactive power compensation, and require less copper in cabling, resulting in substantial savings and a smaller environmental footprint.
