ZUG, Switzerland, Apr 15, 2026 – Siemens Smart Infrastructure deployed direct current (DC) protection and switching hardware for low-voltage networks in data centers, AI factories, and energy systems. The portfolio includes the SENTRON 3QD2 semiconductor circuit breaker and SIRIUS 3RF5 switching device, integrated with SIVACON S8 switchboards and SIVACON 8PS busbar trunking to control power flow across production facilities, battery storage systems, and renewable energy infrastructure.
The SENTRON 3QD2 uses semiconductor technology and protection algorithms to interrupt short circuits in microseconds, up to 1,000 times faster than conventional circuit breakers. This response meets protection requirements in DC grids and maintains system operation during fault events.
“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 parametrizable SENTRON 3QD2 combines protection, switching, monitoring, and energy management in a single compact and multifunctional unit, replacing multiple components and saving significant space. Being maintenance-free with no mechanical wear parts, the SENTRON 3QD2 ensures a long service life and maximum plant availability, making it ideal for 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.
The SIRIUS 3RF5 switching device performs high-frequency switching of resistive loads in DC applications. Its solid-state design reduces mechanical wear during switching cycles and supports continuous operation in industrial systems. The device carries the Siemens EcoTech Label, highlighting its sustainable and transparent product design.
Siemens Smart Infrastructure integrates these devices with SIVACON S8 low-voltage switchboards (with Siemens EcoTech Label) and SIVACON 8PS busbar trunking systems to manage power distribution in production facilities and infrastructure systems using DC architectures.
DC solutions reduce conversion steps between DC and AC, allowing direct connection of photovoltaic generation and battery storage. In manufacturing environments using robots, DC grids combined with energy recovery and storage can reduce peak power demand by up to 80%. DC systems also remove reactive power compensation requirements and reduce copper use in cabling by up to 50%.
Siemens Smart Infrastructure will present the Open Direct Current Alliance and Current/OS portfolio at Hannover Messe 2026 (Hall 27, booth A 48).
Source: Siemens
About Siemens Smart Infrastructure
Siemens Smart Infrastructure, a division of Siemens AG, is headquartered in Zug, Switzerland. The division integrates energy systems, buildings and industrial processes to improve efficiency and support modern infrastructure needs. It provides HVAC controls, fire safety systems, security technologies, energy-performance services, grid-resilience tools and electric-vehicle charging equipment. Its offerings serve sectors such as data centers, energy and manufacturing. The division develops systems that span the energy value chain, from power generation to end use, and focuses on addressing challenges related to urbanization and climate change. It also places emphasis on cybersecurity to support secure and reliable operation in increasingly digital environments. Siemens Smart Infrastructure employed about 79,000 people worldwide.