Traditional mechanical circuit breakers are giving way to solid-state solutions, but silicon-based SSCBs face critical limitations at high voltages and currents. Silicon carbide offers a game-changing advantage: SiC dies can be 10× smaller than silicon equivalents while switching 1000× faster and operating at twice the temperature powerelectronicsnews. With modules now achieving on-resistance as low as 1.7mΩ at 1,200V, SiC is enabling the next generation of intelligent circuit protection – exactly the technology foundation behind our SiC REM201 innovation.
Silicon Carbide: The Future of Solid-State Circuit Breakers
As electrical systems and EVs adopt increasingly higher voltages, the demand for ultra-fast, reliable circuit protection has never been greater. Solid-state circuit breakers (SSCBs) are replacing traditional mechanical breakers due to their robustness, faster switching (microseconds vs. milliseconds), remote configuration capabilities, and elimination of arcing.
However, conventional SSCBs based on silicon TRIACs and MOSFETs face significant limitations. High-current MOSFET-based SSCBs require large heatsinks at high output currents, preventing them from achieving the same power density as mechanical circuit breakers. For emerging 800V+ EV systems, achieving the required low on-resistance (approximately 4mΩ at 500A) is not currently achievable with single silicon devices
Enter Silicon Carbide (SiC)
A SiC die can be up to 10× smaller than its silicon equivalent for the same rated voltage and on-resistance, while switching at least 100× faster and operating at peak temperatures more than twice that of silicon powerelectronicsnews. Companies like Onsemi are now offering EliteSiC power modules with on-resistance values as low as 1.7mΩ for 1,200V devices, integrating multiple SiC MOSFETs in back-to-back configurations to achieve ultra-low resistance and optimized thermal performance.
The Path Forward
As SiC process technology advances and device costs fall with increasing EV adoption, SSCBs constructed from SiC-based devices will inevitably become the norm powerelectronicsnews. The combination of fast switching, zero arcing, maintenance-free operation, and continuously improving cost-effectiveness makes SiC the clear choice for next-generation circuit protection.
Relevance to KIT-WISe
Our development of SiC-based smart electricity management (we do not want to call breaker to get the impression that we are another breaker) technology at the edge of the utility positions us at the forefront of this transition. The superior thermal performance, fast fault response, and compact form factor of SiC devices align perfectly with the intelligent protection and energy management capabilities we’re building into our platform.
