Every watt, protected.
From grid to rack.
Data Center Power Solution
HIITIO supplies the complete electrical component stack for modern data centers — solid-state transformers, SiC/IGBT power modules, ceramic HVDC contactors, semiconductor fuses, high-speed transfer switches, DC disconnect switches, and on-site BESS. One qualified supplier across the full power architecture.
The Challenge
Four problems every data center power architect must solve
AI-driven workloads, hyperscale density, and 24/7 uptime requirements are pushing conventional power infrastructure to its limits. Understanding the core engineering challenges is the first step to selecting the right components
Conversion Losses Compound
Every AC/DC and DC/AC stage dissipates heat and wastes energy. At hyperscale, even a 2% efficiency gain translates to megawatts of recovered capacity. High-frequency SiC-based conversion is the answer.
DC Fault Currents Are Destructive
Without AC's natural zero-crossing, DC bus faults must be cleared by protection devices in microseconds — before IGBT or SiC switches fail. Standard MCBs cannot respond fast enough.
Uptime Is Non-Negotiable
A 20 ms supply interruption can crash servers and corrupt in-flight transactions. Critical loads demand sub-5 ms power transfer from primary to backup source — faster than any conventional ATS.
On-Site Storage Is Essential
Renewable PPAs, grid instability, and extreme weather demand hours of stored on-site energy. BESS must be protected by the same coordinated contactor-fuse stack as the rest of the DC bus.
System Architecture
Where HIITIO components sit in your power chain
A modern DC-architecture data center spans multiple voltage domains and protection layers. This diagram maps each HIITIO product to its precise position in the power chain — from the utility inlet to the server rack.
Product Portfolio
Seven components. One coordinated solution.
Seven product categories, one coordinated architecture. Each component is certified, application-matched, and designed to work alongside the others — eliminating the coordination risk of multi-supplier sourcing.
01
Power Conversion Backbone
Solid-State Transformer (SST)
The SST replaces the conventional iron-core distribution transformer with a three-stage high-frequency SiC/IGBT switching architecture. In a DC-architecture data center, it serves as the single conversion stage from medium-voltage AC to the LVDC bus — eliminating intermediate UPS and rectifier stages, and reducing total conversion losses by 2–4 percentage points at megawatt scale.
- Native LVDC port (380–400 Vdc) for direct DC bus distribution
- Bidirectional power flow — supports grid feed-in from on-site BESS
- Active power factor correction and THD filtering built in
- Capacity: 1.2MW–5MW (flexible capacity expansion)
- Compact footprint: high-frequency transformer replaces bulky iron core
| Capability | Conventional | SST (HIITIO) |
|---|---|---|
| Frequency | 50 / 60 Hz | 1–100 kHz |
| Native DC port | ✗ | ✓ |
| Active PFC | ✗ | ✓ |
| Bidirectional flow | ✗ | ✓ |
| Reactive power control | ✗ | ✓ |
| THD filtering | Passive only | Active, programmable |
| Module Type | Voltage | Current | Application |
|---|---|---|---|
| SiC | Up to 2,200 V | Up to 900 A | SST, 800 V bus DC/DC |
| IGBT (Gen 3) | 600–1,700 V | Custom | UPS inverter, LVDC rectifier |
| SiC/Si Hybrid | Custom | Custom | Cost-sensitive stages |
02
Switching Core
SiC / IGBT Semiconductor Power Modules
Every power conversion stage in a data center — SST rectifier, DC/DC isolated converter, UPS inverter, PCS — is built around semiconductor power modules. HIITIO’s portfolio spans SiC (up to 2,200 V / 900 A), IGBT (third-generation low-loss packaging), and SiC/Si hybrid modules, available from hiitiosemi.com.
- SiC modules: up to 2,200 V / 900 A, high switching frequency, 175°C junction temp
- IGBT modules: 600–1,700 V, low-loss packaging, suitable for UPS and LVDC rectifiers
- SiC/Si Hybrid: cost-optimised for stages where full SiC is not required
- High power density, low Eon/Eoff switching losses
03
DC Bus Control
Ceramic HVDC Contactors
Aviation-grade ceramic hermetic sealing enables reliable arc extinction at voltages up to 2,500 Vdc — without relying on hydrogen or nitrogen fill gas. HIITIO HCF Series contactors appear at every DC bus isolation and pre-charge point in the data center power architecture, from SST intermediate bus to BESS string connection.
- Non-polarised arc extinction — operates in any orientation
- Pre-charge circuit support for limiting capacitor inrush
- Optional auxiliary contacts for position feedback to BMS / EMS
- Wide temperature range: −40°C to +85°C
- Coil voltages: 12 / 24 / 48 Vdc
| Parameter | Specification |
|---|---|
| Rated current | 20 A – 1,000 A |
| Rated voltage | Up to 2,500 Vdc |
| Coil voltage | 12 / 24 / 48 Vdc |
| Temperature range | −40°C to +85°C |
| Arc extinction | Ceramic vacuum seal, non-polarised |
| Certifications | UL 60947-4, CE, CB, CCC, SEMKO |
| Auxiliary contacts | Optional |
| Fuse Type | Standard | Data Center Application |
|---|---|---|
| BS88 Semiconductor | IEC 60269 | SST DC bus, BESS PCS |
| Square Body | IEC 60269 | Industrial DC distribution |
| North American Fiberglass | UL 248 | US market data centers |
| aR (back-up) | IEC 60269-4 | SiC/IGBT module protection |
| gR (full-range) | IEC 60269-4 | General DC circuit protection |
04
Overcurrent Protection
Semiconductor Fuses
SiC and IGBT power modules fail within microseconds when exposed to fault currents exceeding their I²t rating. Standard MCBs and circuit breakers cannot interrupt DC fault currents fast enough. HIITIO semiconductor fuses clear faults within 1–2 ms — before the module’s junction temperature reaches its failure threshold. Fully coordinated with HIITIO’s contactor range.
- DC-rated interruption — no reliance on AC zero-crossing
- aR (back-up) type for semiconductor switch protection
- gR (full-range) type for general DC circuit protection
- IEC 60269 and UL 248 variants for global market compliance
- I²t coordinated with HIITIO contactor interrupting ratings
05
AC Supply Continuity
High-Speed Automatic Transfer Switch (HATS)
HIITIO’s High-speed Automatic Transfer Switch transfers critical AC loads from primary to backup supply in less than 5 milliseconds — within the hold-up window of modern server PSUs. Hybrid solid-state + mechanical contact technology delivers Static Transfer Switch (STS) class performance at a significantly lower cost, with added mechanical durability.
- Transfer time: <5 ms — servers and PLCs stay online during source switch
- Grid-to-grid and generator-to-grid configurations
- 32 A – 800 A current range; 3P and 4P options
- Rated insulation voltage: 1,000 V; operating voltage: up to 400 Vac
- No continuous power loss — unlike full solid-state STS designs
| Parameter | Specification |
|---|---|
| Transfer time | < 5 ms |
| Rated insulation voltage | 1,000 V |
| Operating voltage | Up to 400 Vac |
| Current range | 32 A – 800 A |
| Phase configurations | 3P / 4P |
| Technology | Hybrid solid-state + mechanical |
| Applications | Data centers, UPS bypass, cooling plant |
| BESS Function | Data Center Benefit |
|---|---|
| Peak Shaving | Reduce demand charges and energy cost |
| Backup / UPS | Orderly shutdown or full ride-through |
| Renewable Integration | Absorb solar / wind surplus |
| Demand Response | Grid program revenue |
| Grid Forming | Edge DC / remote AI node stability |
06
On-Site Energy Reserve
Battery Energy Storage System (BESS)
HIITIO’s LiFePO4-based BESS provides on-site energy reserve for data center peak shaving, backup power, renewable integration, and demand response. EVE Grade-A cells, integrated BMS and EMS, and protected by the same HVDC contactor and semiconductor fuse stack as the rest of the DC bus architecture.
- Peak shaving: discharge during high grid pricing / demand charge events
- Backup / UPS function: ride-through during grid outages; bridge to diesel gen-set
- Renewable integration: absorb excess solar / wind, dispatch on demand
- Demand response: participate in grid frequency response programs
- Grid-forming capability for edge data centers and remote AI inference nodes
- LiFePO4 chemistry: thermally stable, long cycle life, no thermal runaway risk
07
Maintenance Isolation
DC Disconnect Switch (HCG4 Series)
The HCG4 Series DC disconnect switch provides a visible, lockable isolation point in high-voltage DC circuits up to 1,500 Vdc and 2,500 A. Unlike a contactor, it is manually operated — enabling maintenance engineers to create a verifiable proven-dead condition before working on DC bus sections, BESS strings, or SST modules. Modular unipolar design simplifies multi-pole assembly.
- Rated voltage: DC 1,000 V / DC 1,500 V
- Rated current: 160 A – 2,500 A
- Double spring mechanism: fast make/break independent of operator speed
- Operation modes: front, side, inside-cabinet, outside-cabinet
- Auxiliary contact module for remote position feedback
- Certifications: CE, RoHS
| Parameter | Specification |
|---|---|
| Rated voltage | DC 1,000 V / 1,500 V |
| Rated current | 160 A – 2,500 A |
| Operating mechanism | Double spring energy storage |
| Operation modes | Front / side / in-cabinet / out-cabinet |
| Accessories | Auxiliary contact module |
| Certifications | CE, RoHS |
| Applications | DC data centers, BESS, SST, solar PV |
SST vs Conventional
Why data centers are moving to solid-state power conversion
Replacing the conventional transformer-UPS chain with an SST cuts conversion stages, eliminates passive iron cores, and unlocks native DC bus output — translating directly to lower losses and smaller footprints at megawatt scale.
| Parameter | Conventional Transformer + UPS Chain | Solid-State Transformer (SST) |
|---|---|---|
| Conversion stages (grid → server) | 3–4 stages (losses compound) | 1–2 stages |
| Native LVDC bus output | ✗ (requires separate rectifier) | ✓ (380 Vdc direct) |
| Power factor correction | Passive (or separate PFC stage) | Active, programmable |
| Footprint | Large (iron core + UPS cabinet) | Compact (HF transformer + modules) |
| Bidirectional power flow | ✗ | ✓ (supports V2G, BESS integration) |
| Efficiency at full load | ~92–95% per stage | 96–98%+ per stage (SiC) |
Why HIITIO
Coordinated components.
Global certifications. Engineering support.
Coordination, certification, and scale — three things that matter when the electrical integrity of a multi-megawatt data center depends on the components you specify.
Coordinated Protection Stack
HIITIO fuse I²t ratings are sized to protect upstream contactors. Contactor interrupting ratings match post-fuse fault currents. Disconnect switch ratings match busbar cross-sections. No coordination mismatch risk.
Global Certifications
UL 60947-4, UL 248, IEC 60269, CE, CB, CCC, SEMKO, RoHS — covering US, EU, China, and emerging market data center projects.
Manufacturing Scale
30,000 m² headquarters with in-house testing laboratory. IATF 16949 quality system. Fully automated production with MES control. High-volume OEM and project supply capability.
Engineering Support
Application engineering for component selection, I²t coordination studies, derating for high-altitude or high-ambient sites, and customisation of ratings, coil voltages, and communication interfaces.
Single Supplier
Contactors, fuses, disconnect switches, transfer switches, power modules, SST components, and BESS — all from one qualified supplier. Fewer procurement relationships, simpler QA, coordinated lead times.
50+ Countries
500+ satisfied customers across North America, Europe, the Middle East, Southeast Asia, and beyond. Established export processes and logistics experience for data center project timelines.
Solution Summary
Complete data center component mapping
From AC/DC conversion at the utility inlet to manual isolation for maintenance access — every layer of the data center power architecture mapped to the HIITIO product that covers it.
| Power Layer | Engineering Challenge | HIITIO Product | Key Specification |
|---|---|---|---|
| AC/DC Conversion | Multi-stage losses, large footprint | Solid-State Transformer | HF switching, native DC port, bidirectional |
| Power Switching | Low-loss, high-frequency conversion | SiC / IGBT Power Modules | Up to 2,200 V / 900 A, low Eon/Eoff |
| DC Bus Protection | Microsecond fault current clearance | Semiconductor Fuses | aR/gR, IEC 60269 / UL 248, <2 ms clearing |
| DC Bus Control | Reliable isolation and pre-charge | Ceramic HVDC Contactors | 20–1,000 A, up to 2,500 Vdc, UL/CE/CB/CCC |
| AC Supply Continuity | Sub-10 ms source transfer | High-Speed Transfer Switch | <5 ms, 32–800 A, 400 Vac |
| On-Site Energy Reserve | Backup power, peak shaving, renewables | BESS (LiFePO4) | EVE Grade-A cells, BMS/EMS integrated |
| Maintenance Isolation | Safe proven-dead DC isolation | DC Disconnect Switch | 160–2,500 A, 1,500 Vdc, lockable |
Ready to spec your data center power architecture?
Whether you’re specifying a 1 MW edge node or a 100 MW hyperscale campus, HIITIO’s engineering team can provide coordinated component recommendations, I²t protection studies, and project pricing within 24 hours.
