——Solid-state circuit breaker · HSB1 series
Break DC Faults in
Microseconds
Not Milliseconds.
No contacts, no arc, no compromise — the HSB1 Series clears short-circuit current in as little as 10μs and lasts over a million operations, field-verified.
HSB1-2500 · 1000Vdc · 500–2500A · liquid-cooled · CCS (China Classification Society) type-approved
——Inside the enclosure
Built for the panel, not the demo bench
Local status & fault display
Trip/Close and Error/Heat indicators with a local parameter readout — technicians can confirm breaker state without opening a cabinet door.
Sealed ventilation grille
Directs airflow across internal power modules while keeping the IP-rated enclosure closed to dust and moisture.
Color-coded DC terminals
Red/blue polarity marking on the primary DC power terminals reduces wiring error during commissioning.
Top-mount busbar brackets
Pre-drilled busbar and lifting brackets on the 2500A/2500-class enclosure simplify panel integration and rigging.
Zhuhai · China Southern Grid
HSB1-630 has carried core power-system protection for over three years.
Inner Mongolia · PV + storage
HSB1-800 handles protection and switching in a flexible conversion system.
DC800V data center
Deployed at the sidecar of an 800V architecture, isolating faults in microseconds.
Metro project
DC220V protection, cutting fault current to limit short-circuit impact.
——Core electrical performance
Why solid-state beats mechanical switching
Mechanical breakers were designed for AC. DC systems need a fundamentally different way to interrupt current.
0 parts
Zero mechanical wear
Fault clearing is done entirely by power semiconductors — no moving parts, no arcing contacts, no contact erosion.
10μs
Microsecond response
Full-cycle breaking from detection to interruption in as fast as 10μs — versus milliseconds for mechanical types.
0 arc
Eliminates DC arc risk
DC has no natural current zero-crossing. Semiconductor switching produces no arc at all — removing the single biggest safety risk in DC switchgear.
1.0M+
Field-verified life
Rated electrical life exceeds one million operations — validated in a real industrial deployment running continuously for years.
——Efficiency & precision
Built for full-load efficiency and precision
Beyond fast breaking, HSB1 runs cooler, measures more accurately, and protects denser electrical systems.
>99%
Low conduction loss
Wide-bandgap modules keep on-state loss under 1% across the full load range, cutting heat and energy cost.
250kA
Strong current limiting
Peak breaking capacity clamps fault current to a few multiples of rated current, easing stress on busbars and cables.
0.2%
Precision metering
Voltage, current, power and energy measurement built in — HSB1 doubles as a protection device and a meter.
3x
Full communication stack
RS-485 Modbus-RTU, Ethernet and 4G, with remote open/close and telemetry via the HIITIO Cloud monitoring platform.
Two architectures cover every budget: SSCB (all-solid-state) for zero mechanical parts and the fastest response, and SSHCB (hybrid) — a mechanical path carries steady current at near-zero loss while semiconductors take over instantly on fault, for cost-sensitive retrofits.
——Technical parameters
Eight current platforms, one architecture
From 40A panel-mount units to 4000A switchgear-class breakers, every HSB1 platform shares the same microsecond-level protection logic.
| Parameter | 40A | 125A | 250A | 630A | 800A | 1600A | 2500A | 4000A |
|---|---|---|---|---|---|---|---|---|
| Rated current | 6–40A | 50–125A | 50–250A | 250–630A | 250–800A | 800–1600A | 500–2500A | 1600–4000A |
| Breaking time¹ | 50μs | 50μs | 50μs | 50μs | 60μs | 60μs | 20μs | 20μs |
| Conduction drop | 0.4V | 0.4V | 0.6V | 0.6V | 0.6V | 2.5V | 3.0V | 3.5V |
| Efficiency | 99.8% | 99.8% | 99.6% | 99.5% | 99.5% | 99.5% | 99.5% | 99.5% |
| Breaking capacity | 50kA | 100kA | 100kA | 200kA | 200kA | 250kA | 250kA | 250kA |
| Topology | SSCB | SSCB | SSCB | SSCB/SSHCB | SSCB/SSHCB | SSCB/SSHCB | SSCB | SSCB |
| Cooling | Air | Air | Air | Air/Liquid | Air/Liquid | Air/Liquid | Liquid | Liquid |
¹ Breaking time shown is for SSCB. SSHCB requires the parallel mechanical stage to act first; SSHCB breaking time is 1.6ms. Rated voltage 220V–1500V. Electrical life 1,000,000 operations across all platforms.
1000Vdc, 500–2500A, ≤10μs breaking, liquid-cooled, TFT touchscreen, CCS type-approved for shipboard DC distribution.
DC800V up to 250A, ≤100μs short-circuit protection, dual power take-off, IP20, adjustable over/under-voltage protection.
Not sure which current rating you need?
Tell us your voltage, prospective short-circuit current, and installation environment — we’ll match a configuration within one business day.
——Fault current comparison
The same short circuit, four technologies
Every millisecond of delay lets fault current climb further before it’s cleared. Only HSB1 interrupts at the semiconductor level from the first microsecond.
Fuse
No current-limiting ability — only melts once fault energy has already reached a damaging level.
Thermal-magnetic breaker
Limits current once triggered, but mechanical contact travel makes it comparatively slow.
Hybrid solid-state (SSHCB)
The mechanical isolator must open before the electronic stage engages, adding delay.
HSB1 solid-state (SSCB)
Clears the fault within microseconds, holding peak current dramatically below the other three.
——Where it's deployed
Six sectors, six failure modes
HSB1’s protection logic is tuned to the fault behavior of each application.
800V DC distribution
No natural current zero-crossing; dense cabinet loads risk cluster shutdown on a single fault.
SiC all-solid-state, bidirectional flow, liquid-cooled, integrates with DCIM/BMS.
Battery cluster protection
Parallel clusters produce high short-circuit gain; slow response risks thermal runaway.
Custom protection curves, PCS coordination, -30°C to +70°C arc-free operation.
Marine DC power
Shipboard DC needs CCS-recognized protection with minimal footprint.
CCS type-approved HSB1-2500, ≤10μs breaking, dual-protection redundancy.
Traction & braking systems
Violent load swings and vibration cause mechanical mis-trips.
Shock-resistant design, dual-channel sampling, TCMS integration.
Multi-source coordination
Mixed solar, storage and EV-charging sources shift fault paths constantly.
Zoned SSCB/SSHCB protection at every source and load point.
Multi-motor power allocation
Multi-motor propulsion needs sub-millisecond reconfiguration without arc risk.
Arc-free SSCB branch switching for rapid power reallocation.
CCS Type Approval
Certified against China Classification Society DC integrated power system guidelines for shipboard use.
Reliability Verification
Compliant with GD28-2023, Ch.4 & 5, for equipment and system reliability — certificate valid through Apr 2031.
1,000,000+ Cycle Life
Field-verified in continuous industrial operation, not lab-only projected life.
Grid-Scale Track Record
Deployed by China Southern Power Grid, State Grid, provincial metro, and multinational manufacturing sites.
——Why HIITIO
A full-stack DC protection manufacturer, not a switch reseller
HVDC contactors, semiconductor fuses, DC MCBs, SPDs and HSB1 are engineered together — not sourced separately and bolted on.
Proven at scale
Delivered to China Southern Power Grid, State Grid, a provincial metro system, and a multinational new-energy manufacturer.
Field-verified life, not just lab data
In a large process-industry deployment, MBS units have run for years, completing over one million reliable operations.
Certified for the sectors that demand it
CCS Type Approval and Reliability Verification for the marine variant, per China Classification Society DC power guidelines.
Direct engineering support
very model recommendation is reviewed by an applications engineer — not auto-generated from a catalog filter.
Ready to move your DC protection to solid-state?
Send your load profile and we’ll return a matched HSB1 configuration and delivery timeline.
— Frequently asked questions
Questions engineers ask before switching
Can HSB1 replace my existing mechanical breaker without redesigning the panel?
In most retrofit cases, yes. HSB1 is available in comparable current platforms and voltage classes, with panel-mount and cabinet form factors. Send your existing busbar spacing and enclosure dimensions and we’ll confirm fit before you order.
Does solid-state switching really eliminate arc risk?
Yes. Because breaking happens at the semiconductor level with no physical contact separation, no arc is formed at all — which is why HSB1 is specified for enclosed environments like battery cabins and hazardous-location panels.
What's the actual breaking capacity, and how does current-limiting work?
Ultimate breaking capacity reaches up to 250kA depending on model. The semiconductor stage reacts within microseconds, clamping peak fault current to a few multiples of rated current — reducing the thermal and mechanical rating requirement on downstream busbars and cables.
Is the marine variant actually certified?
The HSB1-2500 marine variant holds a CCS Type Approval Certificate and a Reliability Verification Compliance Certificate, tested against CCS DC power system guidelines — current certificate validity through April 2031.
What lead time and support should I expect after ordering?
Lead time depends on current rating, cooling method, and communication configuration. Every order includes an applications-engineering review before production, plus commissioning and platform-integration support.
