SolarEdge and Infineon extend partnership to develop solid-state circuit breakers for 800 VDC AI data center power systems
SolarEdge and Infineon Technologies have extended their existing collaboration to develop solid-state circuit breaker (SSCB) technology for 800 VDC power architectures in AI data centers. The announcement, made September 8, 2026, marks a new phase in a partnership that previously focused on SolarEdge’s solid-state transformer platform using Infineon silicon carbide components.
The expansion targets a specific gap in the DC power chain — fault protection between the transformer and the compute rack — at voltage levels where conventional mechanical breakers struggle to perform reliably.
SolarEdge and Infineon expand partnership into solid-state circuit breakers
These two companies have history. Their original collaboration centered on SolarEdge’s Solid-State Transformer platform, which uses Infineon silicon carbide components to convert and distribute power inside next-generation data centers. The new agreement extends that work into a different — but closely related — problem: protecting the DC distribution layer when something goes wrong.
In alternating current systems, current naturally crosses zero 50 or 60 times per second — giving a mechanical breaker a clean moment to interrupt the circuit.
The SSCB work aligns with a leading industry framework for 800 VDC architecture, meaning both companies are building toward a broadly adopted standard rather than a proprietary niche. For data center operators watching the 800 VDC space, that alignment matters as much as the technology itself.
Why DC fault protection at high voltage requires a new approach
Protecting a DC circuit is fundamentally different from protecting an AC one. In alternating current systems, current naturally crosses zero 50 or 60 times per second — giving a mechanical breaker a clean moment to interrupt the circuit. DC has no such zero crossing.
Without that natural pause, a mechanical breaker interrupting a high-voltage DC fault has to physically separate contacts while current is still flowing. That creates an arc: sustained, destructive, and slow to extinguish. At 800 VDC, the problem gets considerably worse.
As AI compute density rises, the industry is shifting toward higher-voltage DC distribution to move more power more efficiently. That shift exposes a real gap. The protection hardware between the solid-state transformer and the compute rack hasn’t kept pace, and conventional mechanical breakers — already challenged at lower DC voltages — become a genuine liability at 800 V.
SSCBs sidestep the problem entirely, interrupting a fault within a few microseconds. They use semiconductor switches instead of mechanical contacts. There’s nothing to separate, no arc to manage, no mechanical wear accumulating over time. That’s the engineering case.
What the extended collaboration delivers for data center operators
The SSCB solution is designed to fill the distribution-layer gap between the solid-state transformer and the compute rack — completing a continuous, DC-native power chain that runs from the medium-voltage grid connection all the way through to the servers drawing power.
SolarEdge is leading the SSCB design; Infineon is contributing the semiconductor components, consistent with its role in the SST platform. The division mirrors the earlier collaboration: SolarEdge owns the system architecture, Infineon supplies the underlying power semiconductors.
The combined 800 VDC powertrain is designed to support higher rack density, a pressing concern as AI workloads push power draw per rack well beyond what earlier data center designs anticipated. The companies also say the architecture is intended to improve reliability and reduce environmental impact, though specific performance figures weren’t disclosed.
Background: SolarEdge’s DC power strategy and Infineon’s semiconductor role
SolarEdge has spent more than two decades working in DC-coupled power electronics, primarily in solar energy systems. That background gives the company a specific kind of expertise — managing DC power at scale, across voltage levels, with a focus on conversion efficiency. Extending that competency into AI data centers is a logical move, even if the application looks quite different.
The company’s vision is a fully DC-native chain: power enters from the medium-voltage grid, gets converted and distributed through the SST, protected by the SSCB, and delivered to the compute rack — all without the losses that come from repeated AC-to-DC conversion steps. Most data centers today aren’t built this way. That’s the point.
Infineon brings a different kind of scale, employing around 57,000 people worldwide and reporting approximately $16.3 billion in revenue for fiscal year 2025, making it one of the largest semiconductor companies focused specifically on power systems. For a project that lives or dies on the performance of its switching components, that’s a meaningful credential.
The collaboration also reflects something broader happening across the industry. Traditional data center power infrastructure relies heavily on AC distribution, with multiple conversion stages between the utility grid and the server. DC-native architectures cut those conversion steps, reducing losses and simplifying the power path — an efficiency difference that’s harder to ignore as AI workloads drive consumption higher.
What this announcement means in practice
The September 8 announcement confirms that SolarEdge and Infineon are moving beyond the transformer layer and tackling the full distribution stack. The SSCB work closes the last major gap in their grid-to-rack DC power chain.
For the data center industry, the practical takeaway is fairly direct: two established companies with complementary capabilities are jointly developing the fault-protection technology that 800 VDC architectures need before they can be deployed at scale. SolarEdge brings system design and DC power expertise; Infineon brings semiconductor components and manufacturing depth.
No timelines for commercial availability have been announced, and the companies haven’t disclosed specific performance benchmarks for the SSCB solution. What the announcement does establish is scope and direction — a complete, DC-native power architecture built for the demands of AI infrastructure.
Kelly is an experienced writer with 15 years of experience exploring the big stories that shape our world, from tech breakthroughs and space exploration to climate, energy, and the fascinating quirks of science. She has a talent for turning complex ideas into sharp, memorable insights that stay with readers long after they’ve finished reading.
