Siemens Smart Infrastructure has introduced a new portfolio of direct current (DC) protection and switching solutions, aimed at supporting more efficient and reliable low-voltage power distribution. The range includes the SENTRON 3QD2 semiconductor circuit breaker and the SIRIUS 3RF5 solid-state switching device.
Designed for applications such as data centres, industrial facilities and battery storage systems, the portfolio addresses growing demand for efficient and sustainable power systems. The solutions can be integrated into systems such as SIVACON S8 switchboards and SIVACON 8PS busbar trunking.
The transition from alternating current (AC) to DC is gaining importance as renewable sources such as photovoltaics and battery storage operate on DC. By reducing conversion losses and enabling direct integration, DC systems offer improved efficiency compared to traditional AC grids.
A central component of the new offering is the SENTRON 3QD2, which uses semiconductor technology and protection algorithms to interrupt short circuits in microseconds, significantly faster than conventional systems. The device combines protection, switching, monitoring and energy management in one unit and operates without mechanical wear parts.
The SIRIUS 3RF5 complements the portfolio as a solid-state switching device designed for high-frequency switching of resistive loads, supporting reliable and low-wear operation in industrial environments.
According to Siemens, the use of DC systems can reduce peak power demand by up to 80 % in certain applications and cut cabling material requirements by up to 50 percent. The company will present the new portfolio at Hannover Messe 2026.
Source: Siemens
