SolarEdge and Infineon extend partnership to develop solid-state circuit breakers for 800 VDC AI data centers

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, targets one of the more stubborn engineering gaps in high-voltage direct-current distribution: protecting circuits from faults without the limitations of conventional mechanical breakers.

The two companies are betting that solid-state protection is the missing piece needed to complete a fully DC-native power path — from the medium-voltage grid all the way to the compute rack.

SolarEdge and Infineon broaden their partnership into solid-state circuit breakers

This isn’t a new relationship. SolarEdge and Infineon had already announced a joint effort around SolarEdge’s solid-state transformer (SST) platform, which uses Infineon silicon carbide (SiC) semiconductor components. The new agreement pushes the partnership further down the power chain, into circuit protection.

The SSCB addresses the distribution layer between the SST and the rack, and according to the company, that segment was the last major unresolved piece of the chain.

SolarEdge is leading the SSCB design, with Infineon supplying the SiC components that make it viable at 800 VDC. The collaboration aligns with leading industry frameworks for 800 VDC architecture — a standard gaining traction fast as AI workloads drive up power density across hyperscale facilities.

Why DC fault protection at high voltage requires a new approach

The push toward higher-voltage DC distribution isn’t arbitrary. As AI compute density rises, operators need to move more power more efficiently, and cutting multiple AC-to-DC conversion stages reduces energy losses while simplifying infrastructure. But going DC-native at 800 volts introduces a protection problem that AC systems simply don’t share.

In AC circuits, current naturally passes through zero 50 or 60 times per second. That zero crossing gives a mechanical breaker a clean moment to interrupt the circuit. DC has no such moment — without it, mechanical interruption risks sustaining an arc, a continuous electrical discharge that’s both dangerous and damaging.

Conventional electromechanical breakers are also comparatively slow. In a high-density AI environment, where fault currents can escalate rapidly, that speed gap isn’t just inconvenient — it’s a real reliability risk. The outcome is a critical unresolved segment in the distribution layer sitting between the solid-state transformer and the compute rack.

SSCB technology is designed to interrupt faults in microseconds with no mechanical contacts

Solid-state circuit breakers sidestep the arcing problem entirely. No mechanical contacts means nothing to arc. Interruption is handled electronically, and it happens fast — within a few microseconds, which is orders of magnitude quicker than what electromechanical breakers can achieve.

That speed matters enormously in an 800 VDC environment. Faster fault interruption means less energy released during a fault event, which translates directly to safer operation and better protection of expensive compute hardware. For hyperscale operators running thousands of AI accelerators, that kind of reliability isn’t optional. Eliminating mechanical wear also removes a maintenance variable that, at data center scale, adds up quickly.

The SSCB fills the final gap in SolarEdge’s grid-to-rack DC powertrain

SolarEdge is building what it describes as an 800 VDC powertrain for AI factories — a DC-native chain running from the medium-voltage grid connection through conversion, distribution, and protection, all the way to the compute rack. Every segment has to work. The SSCB addresses the distribution layer between the SST and the rack, and according to the company, that segment was the last major unresolved piece of the chain.

This work draws on a foundation SolarEdge has been building for more than two decades. The company brings over 20 years of experience in DC-coupled power electronics — a background rooted in photovoltaic inverter systems that has since expanded into storage, EV charging, and grid services. That heritage gives SolarEdge a credible starting point for tackling DC power architecture at data center scale.

Company profiles and market context

SolarEdge is a global smart energy technology company. Best known for DC-optimized inverter solutions for photovoltaic systems, its portfolio now spans battery storage, EV charging, and grid services. The data center powertrain initiative represents a significant expansion into a new vertical.

Infineon Technologies AG is a global semiconductor leader focused on power systems and the Internet of Things. The company had around 57,000 employees worldwide as of end of September 2025 and generated revenue of approximately $16.3 billion (€14.7 billion) in its 2025 fiscal year. Infineon trades on the Frankfurt Stock Exchange under the ticker IFX, and on the US OTCQX market under IFNNY.

The broader context is straightforward enough. AI workloads are consuming more power, and data center operators are under pressure to deliver that power efficiently and reliably. DC-native architectures offer real efficiency advantages by cutting unnecessary conversion stages, but they require a full stack of purpose-built components to work safely — which is exactly the gap SolarEdge and Infineon are working to close.

SSCB completes the distribution layer

The announcement confirms that SolarEdge and Infineon have extended their collaboration beyond the SST platform into solid-state circuit protection. SolarEdge is designing the SSCB; Infineon is providing SiC components. The technology targets 800 VDC AI data center architectures and is designed to interrupt DC faults within microseconds — far faster than conventional mechanical breakers.

With circuit protection now in development, the SSCB completes the distribution layer in SolarEdge’s grid-to-rack powertrain, addressing the segment between the solid-state transformer and the compute rack. Together, the two companies are positioning this as a comprehensive solution for the power challenges that high-density AI infrastructure is creating across the industry.

Kelly Lippke

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.