Infineon and SolarEdge extend SiC collaboration to DC circuit breakers
Image: Infineon
Infineon Technologies and SolarEdge Technologies have extended their collaboration to cover solid-state circuit breaker (SSCB) technology aimed at 800 VDC power distribution in AI and hyperscale data centres, the companies announced on 9 September 2026.
SolarEdge is leading design of the SSCB solution, with Infineon supplying its CoolSiC silicon carbide (SiC) JFET devices as the switching core. The companies describe the work as addressing fault protection in the distribution layer between a solid-state transformer (SST) and the compute rack, part of what they term a DC-native power chain from medium-voltage grid connection to the rack.
Why DC fault interruption is different
According to the companies, direct current lacks a natural current zero, meaning mechanical breakers face arcing challenges and interrupt faults comparatively slowly. Infineon and SolarEdge state that SSCBs are designed to interrupt faults within a few microseconds without mechanical contacts, which they say is orders of magnitude faster than electromechanical breakers.
Builds on earlier SST work
The SSCB collaboration extends SolarEdge's SST platform using Infineon SiC components, first announced in November 2025. That SST is designed, according to the companies, to convert directly from 13.8-34.5 kV medium voltage to 800-1500 VDC at over 99 percent efficiency, collapsing multiple conversion stages into one unit.
SolarEdge chief executive Shuki Nir said high-density AI infrastructure at 800 VDC demands both efficiency and protection, and that Infineon's SiC technology makes solid-state protection practical at scale. Infineon's Andreas Weisl said the combination targets faster, safer and more reliable operation as data infrastructure becomes more exposed to electrical faults. These are vendor statements rather than independently verified performance data.
No shipping product, timeline or detailed device specifications were disclosed alongside this collaboration announcement.
