Summary
- SolarEdge is developing solid-state circuit breakers for 800V DC data centre distribution using Infineon silicon-carbide JFET devices.
- The protection layer is intended to isolate DC faults between solid-state conversion equipment and high-density compute racks within microseconds.
- The work extends an existing solid-state-transformer programme aimed at a more direct medium-voltage-to-rack DC power chain.
SolarEdge and Infineon Technologies have expanded their data centre power collaboration into solid-state circuit breakers designed to protect 800V DC distribution systems serving high-density AI computing infrastructure.
SolarEdge is leading development of the solid-state circuit-breaker, or SSCB, with Infineon supplying silicon-carbide JFET technology for the protection devices. The companies are targeting the distribution layer between solid-state power conversion equipment and the compute rack.
The work addresses one of the technical problems created by higher-voltage direct-current distribution. Unlike alternating current, DC does not naturally pass through a zero-current point every cycle, making interruption more difficult and increasing the challenge of controlling an electrical arc when conventional mechanical contacts open under fault conditions.
SolarEdge and Infineon say their solid-state approach is designed to interrupt faults within a few microseconds. That performance is a company design target rather than an independently verified deployment result, but it illustrates why semiconductor-based protection is being considered alongside emerging 800V DC architectures.
Fast selective isolation becomes more important as the value and power density of equipment connected to each distribution branch increases. A protection system needs to clear a fault quickly enough to limit damage while avoiding unnecessary interruption of healthy parts of the electrical system.
The collaboration builds on work announced by the two companies in November 2025 around SolarEdge’s solid-state transformer platform. That system is being designed to convert medium-voltage supplies in the 13.8kV to 34.5kV range directly to between 800V and 1,500V DC.
SolarEdge has claimed conversion efficiency above 99% for the transformer architecture. The commercial product remains part of a developing data centre power platform, so efficiency, availability, and operating performance will ultimately need to be demonstrated across deployed systems rather than assessed from component specifications alone.
The broader objective is to reduce the number of conversion stages between the grid connection and computing hardware. Conventional data centre electrical systems typically transform and convert power several times before it reaches server components. Each stage introduces losses, occupies physical space, creates heat, and adds equipment requiring protection and maintenance.
Higher-voltage DC distribution offers a route to simplify part of that chain, particularly for AI systems whose internal electronics ultimately consume DC power. Increasing distribution voltage also allows the same power to be moved at lower current, which can reduce conductor requirements and electrical losses as rack densities rise.
The protection problem becomes correspondingly important. Electrical architecture cannot be evaluated only on conversion efficiency: fault clearing, selectivity, maintainability, redundancy, safe isolation, and compatibility with backup-power systems all influence whether a new topology can support critical workloads.
Infineon’s silicon-carbide devices are being used because wide-bandgap semiconductors can operate efficiently at high voltages and switching speeds. In an SSCB application, the semiconductor performs the interruption electronically rather than waiting for mechanical contacts to separate.
SolarEdge describes the planned system as part of an 800V DC powertrain extending from the medium-voltage grid connection through conversion and distribution to the compute rack. If the architecture moves into large commercial deployments, the circuit-breaker layer will be one of the places where its resilience claims are tested most directly.
No commercial deployment, customer, rating range, or volume-production timetable for the new SSCB was disclosed with the announcement. The development therefore represents an engineering step towards a DC-native data centre power chain rather than evidence that 800V DC has displaced conventional architectures. The next stage will be proving that the protection technology can deliver its speed and efficiency targets under the fault conditions and redundancy requirements of operational AI facilities.
