- Quick comparison: ten SSCB names buyers keep seeing
- When an SSCB is the right buy — and when it is not
- The four questions that decide the RFQ
- The manufacturers in detail
- 1. ABB
- 2. Siemens
- 3. Eaton
- 4. Schneider Electric
- 5. Atom Power
- 6. LS Electric
- 7. Fuji Electric
- 8. Mitsubishi Electric
- 9. Blixt Tech
- 10. Infineon Technologies
- Finished breaker vs “SSCB kit”: do not mix the PO
- Common procurement mistakes
- Frequently asked questions
- Who makes the best solid-state circuit breaker?
- How fast is a solid-state breaker compared with a mechanical one?
- Can SSCBs replace MCCBs in every panel?
- Do solar projects need solid-state breakers?
- Related components on the DC side
Mechanical breakers clear faults in tens of milliseconds. That is fine for most AC branch circuits. It is not fine for an 800 VDC AI rack, a battery container, or a DC microgrid where a short can dump destructive energy before the contacts finish moving.
That is why solid-state circuit breakers (SSCBs) — also called semiconductor circuit breakers — are showing up in RFQs. For a B2B buyer, the hard part is not memorizing brand names. It is telling a finished, certified breaker apart from a semiconductor evaluation board, and knowing when an SSCB is the wrong tool entirely.
This guide profiles ten manufacturers that procurement teams actually meet in 2026 SSCB conversations. We do not invent market-share percentages. Order reflects product maturity, public certification signals, DC portfolio depth and how often each name appears in data-center, industrial and storage sourcing — treat the list as a shortlist to pressure-test, not a league table.
Quick comparison: ten SSCB names buyers keep seeing
| # | Company | What they actually sell | Typical buyer |
|---|---|---|---|
| 1 | ABB | Finished DC SSCB platforms (e.g. SACE Infinitus) | Data centers, marine, industrial DC |
| 2 | Siemens | SENTRON semiconductor breakers (e.g. 3QD2 direction) | Factories, building DC, AI halls |
| 3 | Eaton | Wide-bandgap / Polaris-class static DC breakers | Commercial & industrial DC distribution |
| 4 | Schneider Electric | 800 VDC power + protection concepts | Hyperscale / rack power packages |
| 5 | Atom Power | UL-listed digital solid-state breaker / panel direction | North American commercial projects |
| 6 | LS Electric | DC protection devices for data centers & renewables | Asian and export DC projects |
| 7 | Fuji Electric | Industrial semiconductor-based protection | Industrial power and OEM packages |
| 8 | Mitsubishi Electric | Industrial and storage DC protection | Factory boards, ESS packages |
| 9 | Blixt Tech | IEC-oriented residential / light-commercial SSCB | European building pilots |
| 10 | Infineon | SiC modules and SSCB reference platforms | OEMs designing their own breaker |
Note: Infineon is on this list as an enabling semiconductor supplier, not as a drop-in panelboard brand. Several “SSCB manufacturer” roundups blur that line. We keep it explicit so purchasing does not quote Infineon as if it were ABB.
When an SSCB is the right buy — and when it is not
Buy an SSCB when fault energy on a DC bus can destroy semiconductors or capacitors before a mechanical device opens, or when you need remote diagnostics, high cycle life and software-defined trip behavior. Typical fits: 800 VDC AI distribution, BESS DC links, EV charging DC stages, marine and industrial DC grids.
Do not force an SSCB into a normal AC residential panel just because the datasheet mentions “solid-state.” Conduction losses, cooling, price and listing paths are different. For PV string protection, a conventional DC MCB / MCCB or fuse still does most jobs — an SSCB is a different product class.
The four questions that decide the RFQ
- Voltage class. 240–500 VDC covers many server and telecom buses; ~800 VDC is the AI data-center conversation; 1000–1500 VDC shows up in storage and large PV DC. Quote the bus you actually have, not a marketing round number.
- Clearing time and let-through. Microsecond-class interruption is the selling point. Ask for published interruption time, peak let-through and the inductance assumptions behind the test. Marketing “1,000× faster” claims are useless without the baseline.
- Listing path. IEC 60947-2 for many global LV switchgear projects; UL 489 / related North American paths for panel builders. A press release is not a certificate for the exact frame you are ordering.
- SiC vs IGBT vs hybrid. SiC MOSFET designs chase lower conduction loss and fast turn-off. IGBT can be more rugged at very high current. Hybrid mechanical-plus-semiconductor designs trade some speed for lower losses. Match the topology to duty, not to the coolest acronym.
The manufacturers in detail
1. ABB
ABB is the name most engineers mention first for commercial DC SSCBs. SACE Infinitus and related platforms are positioned as finished breakers with serious current ratings and an IEC 60947-2 certification story that competitors still chase. Public materials have discussed multi-kiloamp frames and sub-25 µs interruption on specific configurations — always verify the exact order code.
Why buyers choose it: a complete breaker, not a reference board; channel and documentation that large projects can take to lenders and consultants.
What to check: cooling method, bidirectional vs unidirectional protection, communication options, and whether your short-circuit current and cable inductance sit inside the published envelope.
2. Siemens
Siemens SENTRON semiconductor breakers (including the 3QD2 direction announced for DC protection) target factories and AI data-center DC distribution. Public collaboration with Infineon on 1200 V CoolSiC modules is a useful signal: the breaker is a power-electronics product, not a rebadged contactor.
Why buyers choose it: SENTRON ecosystem familiarity and microsecond-class DC protection messaging for industrial buyers.
What to check: released catalogue codes for your voltage/current, regional availability, and whether the unit is sold as a breaker or as part of a wider DC portfolio package.
3. Eaton
Eaton has worked on wide-bandgap static breakers for years and publishes 800 VDC reference architectures aimed at commercial and industrial distribution. Polaris-class solid-state DC breakers are discussed for roughly 800–1500 VDC with interruption in the tens of microseconds.
Why buyers choose it: fits buyers already standardized on Eaton UPS, PDUs and switchgear.
What to check: whether the SSCB is orderable as a standalone device in your country or only inside an Eaton-designed DC architecture.
4. Schneider Electric
Schneider’s 2025–2026 public story around 800 VDC conversion and protection is aimed at hyperscale and high-density compute. Buyers often evaluate Schneider as a system package — conversion, protection and serviceability — rather than as a single breaker SKU.
Why buyers choose it: rack-level and facility-level integration, especially where Live Swap / service concepts matter.
What to check: get the coordinated BOM. Quoting “a Schneider SSCB” without the surrounding DC architecture usually fails in engineering review.
5. Atom Power
Atom Power helped put UL-listed solid-state breakers and digital panelboards on the North American map, including commercial building and EV-charging adjacent use. Ownership under SK Inc. means you should reconfirm current product status and support channels before locking a multi-year AVL.
Why buyers choose it: UL-oriented positioning for NA panel builders who cannot wait for IEC-only European devices.
What to check: listing scope after ownership changes, spare-part policy, and software/firmware support lifetime.
6. LS Electric
LS Electric shows up in data-center and renewable DC device shortlists, including higher DC voltage classes for specialty applications. It is a practical option when the project already uses LS switchgear or when Asian manufacturing and lead time dominate the decision.
Why buyers choose it: DC portfolio breadth at competitive industrial pricing.
What to check: English documentation quality, third-party test reports for your exact rating, and local authorized service.
7. Fuji Electric
Fuji’s semiconductor-based industrial breakers fit machinery and factory power systems more than hyperscale rack marketing. Include Fuji when the board or machine OEM is already Fuji-centric.
What to check: AC vs DC catalogue clarity — do not assume an industrial “semiconductor breaker” covers your 800 VDC bus.
8. Mitsubishi Electric
Mitsubishi competes through industrial and energy-storage DC protection packages. Strong where Japanese industrial specs or existing Mitsubishi drives/controls pull the AVL.
What to check: whether you are buying a discrete SSCB or a packaged protection assembly with different spare-part logistics.
9. Blixt Tech
Blixt (Sweden) represents the residential / light-commercial SSCB niche with IEC-oriented products such as Blixt Zero. Useful if your RFQ is a building panel pilot in Europe — less relevant for a 2.5 kA data-center DC feeder.
What to check: production capacity and installer training. Niche SSCB brands can win a pilot and then struggle on volume.
10. Infineon Technologies
Infineon supplies CoolSiC MOSFET modules, JFETs, gate drivers and reference designs used inside other companies’ breakers (Siemens is a public example). If you are an OEM building an SSCB, Infineon belongs on the semiconductor AVL. If you are a panel builder buying a finished breaker, quote ABB/Siemens/Eaton — not Infineon part numbers.
Finished breaker vs “SSCB kit”: do not mix the PO
| You are buying… | Quote these | Do not treat as substitutes |
|---|---|---|
| A listed breaker for a project | ABB, Siemens, Eaton, Schneider, Atom, LS, Fuji, Mitsubishi, Blixt | Evaluation boards, bare SiC modules |
| Semiconductors to design a breaker | Infineon and peer SiC/IGBT vendors | Finished SENTRON / Infinitus frames |
| PV string DC protection | Conventional DC MCB/MCCB, fuses, isolators | Data-center SSCBs (wrong class) |
Common procurement mistakes
- Accepting a press release as an orderable SKU.
- Comparing interruption times without stating test inductance and fault current.
- Ignoring cooling — SSCBs are power electronics; heat sinks and airflow are part of the cost.
- Putting Infineon and ABB in the same price column.
- Using an SSCB RFQ language for ordinary PV combiner DC breakers.
Frequently asked questions
Who makes the best solid-state circuit breaker?
There is no single best. ABB and Siemens lead many finished-product conversations for industrial and data-center DC. Eaton and Schneider matter when the surrounding power system is already theirs. Atom Power matters for UL-centric NA projects. Infineon matters if you design the breaker yourself.
How fast is a solid-state breaker compared with a mechanical one?
Credible SSCB claims sit in the microsecond range; many mechanical DC devices sit in the millisecond range. Always read the manufacturer’s test conditions — the gap collapses or widens depending on the fault scenario.
Can SSCBs replace MCCBs in every panel?
No. Cost, losses and listings still favor mechanical breakers for most AC distribution. SSCBs win on specific DC and high-speed protection problems.
Do solar projects need solid-state breakers?
Most PV arrays still use conventional DC protection in combiners and inverter inputs. SSCBs appear more often on battery DC links, DC-coupled storage architectures and specialty DC microgrids — not as a default string combiner part.
Related components on the DC side
If your project mixes advanced DC protection with everyday solar BOS, keep the BOMs separate. ShineTong supplies conventional PV DC protection and distribution components that still do the bulk of array work:
Company details above come from public product pages, certification announcements and industry reporting. SSCB catalogs move quickly — confirm the exact model, rating and certificate with the manufacturer or authorized distributor before you purchase. ShineTong is not affiliated with the brands listed.
