High-current solutions (400A–800A) engineered for 3P/4P power architectures, delivering <5 ms transfer speed, low-heat mechanical reliability, and practical STS-replacement performance for data centers and mission-critical facilities.
Optimized for 400A and 800A applications that require fast response, high reliability, and cost-efficient deployment.
Supports heavy-load distribution in large buildings and industrial power networks.
Wide rating options for flexible integration into critical circuits.
Ensures stable operation during peak load or grid disturbances.
Suitable for cabinets without forced cooling.
Engineered for modern power systems requiring neutral protection, high load stability, and flexible distribution architectures.
Ideal for data centers, commercial buildings, and networks with unbalanced loads.
Perfect for plants, telecom, and equipment with three-phase power distribution.
Works seamlessly in grid-to-grid or generator-to-grid configurations
Ensures stable performance even in complex power networks.
Ultra-fast transfer minimizes voltage dips and prevents equipment interruption.
Protects PLCs, servers, and industrial controllers from resets.
Ensures accurate source evaluation and rapid decision-making.
Maintains continuity during fluctuating utility conditions
Comparable performance to STS for most mission-critical loads.
The switch integrates a solid-state fast-response module with a high-reliability mechanical contact system, enabling ultra-fast transfer capability without the continuous power loss seen in full solid-state designs.
| ATS (Automatic Transfer Switch) | HATS (High-speed Transfer Switch) | STS (Static Transfer Switch) | |
|---|---|---|---|
| Standards | GB/T14048.11 (IEC60947-6-1) |
GB/T14048.11 (IEC609476) |
GB/T34940.1/2/3 |
| Transfer Time | Transfer time on power loss > 100 ms | Transfer time on power loss < 5 ms. | Transfer time on power loss: 4 to 10 ms |
| Availability of Manual Operating Handle | Manual operating handle is available, allowing manual operation in emergencies | Manual operating handle is available, allowing manual operation in emergencies. | Not available |
| Resistance to Harmonic Interference | Excellent immunity to harmonic interference | Excellent immunity to harmonic interference. | Weak immunity to harmonic interference. |
| Surge Withstand Capability (Lightning Protection) | Excellent | Excellent | Very fragile |
| Overload Capacity | Excellent | Excellent | Overload current: 1.25× rated. For inductive loads, capacity should be 3–5 times larger. |
| Load Category | Motor/Mixed Load: Up to 10× inrush and breaking current. |
Motor/Mixed Load: Up to 6× making and breaking current. |
IT / Resistive Load |
| Availability of Arc Extinguishing System |
Air arc extinguishing | Features a vacuum arc extinguishing system for fast arc suppression. | Not available |
| Product Structure | SPDT or DPST structure, with single-phase motor or excitation drive. | Electromagnetic (excitation) operation, Mechanical latching, Vacuum arc extinguishing | Simple dual thyristor (SCR) arrangement. |
| Environmental Requirements | No Limitations | No Limitations | Requires precision air conditioning or fan-based cooling. |
| Energy consumption | No Consumption | No Consumption | High energy consumption: A 400A model typically consumes around 48 kilowatt-hours per day. |
| Cost | Relatively low | Moderate cost | Higher cost |
A clear side-by-side comparison to help you understand how High-Speed Transfer Switch (HTS) delivers near-STS performance with lower heat, simpler deployment, and greater cost efficiency.
Best for: High-density data centers & ultra-sensitive IT loads
Perfect for: Industrial automation, hospitals, telecom, commercial critical loads
Designed to ensure continuous power, reduced downtime, and long-term operational reliability.
Prevents equipment reboot, communication drop, or automation faults.
Supports industrial control, robotics, IT systems, and sensitive electronics.
Hybrid mechanism minimizes wear and ensures longevity even under frequent disturbances.
No continuous conduction loss as seen in STS systems; reduced thermal footprint.
No cooling fans, heat sinks, or special cabinet upgrades required.
Optional Modbus TCP/RTU integration for real-time diagnostics and alarms.
Built to ensure uninterrupted performance in data centers, telecom nodes, medical facilities, and other 24/7 critical infrastructures.
Guarantees rapid source switching to ensure uninterrupted operation. Required by safety-critical standards.
Supports elevators, pumps, air handling units, and essential building loads.
Protects sensitive diagnostic and laboratory equipment.
Prevents communication dropouts or equipment resets during power anomalies.
Ensures continuous operation of automation systems, conveyors, PLCs, and process controls.
Supports security, monitoring, lighting, and mission-critical systems.
Detailed performance parameters and compliance data for engineering evaluation.
| Model | HCT Series of High-speed Transfer Switch | ||||
|---|---|---|---|---|---|
| Rated Operating Voltage(Ue) | AC 400V | ||||
| Frame Current | 125A | 200A | 400A | 800A | |
| Rated operating Current (Ie) | 32A/63A/100A/125A | 160A/200A | 315A/400A | 630A/800A | |
| Transfer time | 5ms | ||||
| Poles | 2P/3P/4P | ||||
| Electrical level | Class PC | ||||
| Utilization Category | Synchronous Transfer-Utilization Category AC-33iB/ Asynchronous (or Out-of-phase)Transfer-Utilization Category AC-31A |
||||
| Rated Frequency | 50/60 Hz | ||||
| Rated Insulatin Voltage (Ui) | AC 1000V | ||||
| Rated Short-time Withstand Current (Icw) |
16kA/1s | ||||
| Rated Impulse WithstandVoltage(Uimp) | 12kV | ||||
| Lifespan | Mechanical | 20,000ops | |||
| Electrical | 10,000 ops | ||||
| Standards | GB/T 14048.11-2016 | ||||
| Cutout Dimensions forController | 268*190mm | ||||
As a professional manufacturer of high-performance electrical components, HIITIO delivers solutions built for industrial, power distribution, and automation markets.
With a strong R&D team specializing in hybrid fast-transfer architecture, HIITIO develops high-speed switching solutions that bridge the gap between mechanical systems and fully solid-state designs—delivering <5ms performance with maximum reliability.
All products undergo strict endurance, heat rise, dielectric, and fault simulation tests. The HCT Series complies with GB/T 14048.11-2016 and IEC 60947-6-1, ensuring stable operation under demanding electrical conditions.
HIITIO operates a modern production facility equipped with precision assembly lines, automated testing platforms, and a complete QC system—ensuring consistency, longevity, and dependable performance across all product batches.
With global logistics coverage and responsive engineering assistance, HIITIO provides fast delivery, detailed technical consultations, and long-term servicing to ensure your power system runs seamlessly.
Every HTS unit is produced in HIITIO’s advanced facility under strict quality control, and independently certified to meet global electrical and mechanical standards. From raw materials to final endurance verification, our production system ensures stable supply, consistent quality, and full compliance for mission-critical applications.
Join our global network of distributors, integrators, and engineering partners delivering reliable high-speed transfer switching solutions to mission-critical industries worldwide.
<5ms switching | 400A–800A | 3P/4P | STS Alternative
Ensure uninterrupted power continuity with HIITIO High-Speed Transfer Switches, engineered for rapid <5 ms source switching and high-reliability performance. Ideal for mission-critical facilities such as hospitals, data infrastructure, industrial automation, high-rise buildings, and telecom networks, HIITIO delivers fast response, stable operation, and long-term durability you can trust.
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HIITIO® was established in 2018 as a result of Hecheng Electric introducing a mature R&D team. HIITIO specializes in producing high-voltage DC electrical devices for EV, solar energy systems, and energy storage applications.
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