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 1,000 times faster than conventional systems.

Siemens Smart Infrastructure has introduced a portfolio of direct current protection and switching products for low-voltage power distribution and industrial switching applications. The portfolio includes the SENTRON 3QD2 semiconductor circuit breaker and the SIRIUS 3RF5 solid-state switching device, and is intended for use in systems such as SIVACON S8 low-voltage switchboards and SIVACON 8PS busbar trunking systems. Target applications include data centers, AI facilities, production sites, battery storage systems and renewable energy integration.

The use of direct current systems is increasing as more renewable energy and battery storage installations are deployed. Photovoltaic systems and battery storage operate with direct current, and DC distribution can reduce losses associated with DC-to-AC conversion while enabling more direct integration of these energy sources. Siemens is involved in this area through research and development and through participation in industry groups including the Open Direct Current Alliance and Current/OS.

SENTRON 3QD2 semiconductor circuit breaker

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 1,000 times faster than conventional systems. This is mandatory for DC grids and offers a significant increase of protection and system availability.

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, highlighting its sustainable and transparent product design.

SIRIUS 3RF5 solid-state switching device

Together with the SIVACON S8 low-voltage switchboard, SIVACON 8PS busbar trunking systems and integrated DC protection and switching devices, the portfolio is intended to support DC power distribution in production and infrastructure applications.

DC systems can also affect overall system design and resource use. In manufacturing environments using robots, DC technology combined with energy recuperation and storage can reduce peak power demand by up to 80 percent. DC systems also do not require reactive power compensation and can use less copper in cabling, with material savings of up to 50 percent.