In mission-critical facilities such as data centers, hospitals, industrial plants, and large commercial buildings, power continuity is non-negotiable. Static Transfer Switches (STS) play a vital role by enabling instantaneous power-source switching when the preferred supply becomes unstable. The global STS market has evolved rapidly, with manufacturers focusing on faster transfer times, digital diagnostics, modular serviceability, and higher reliability.
This guide ranks the top 10 STS manufacturers worldwide. Whether you are designing a new power architecture or upgrading an existing dual-bus system, this list provides a clear overview of the best manufacturers and their flagship solutions.
1. HIITIO (HTS — High-speed Transfer Switch)
- Founded: 2018
- Headquarter: Zhejiang / Hangzhou, China
- Core Products: HVDC contactors, semiconductor fuses, HTS/transfer switches, PV/ESS components
- Links:
- HIITIO homepage: https://www.hiitio.com/；
- HTS product page: https://www.hiitio.com/high-speed-transfer-switch/.
HIITIO positions its HTS series explicitly as a practical, lower-cost alternative to conventional STS units. Built by a new-energy specialist founded in 2018, HIITIO’s HTS (often described as High-speed Transfer Switch or HTS) delivers sub-5ms transfer performance while using a mechanically robust design that emphasises serviceability and lower lifecycle cost. That combination — STS-comparable speed, simpler modular maintenance, and a stated >50% total cost saving compared with many STS solutions — is aimed at applications from fire-safety systems to data-hall dual-bus arrangements where budget and maintainability matter alongside speed.
Flagship product: HTS (High-speed Transfer Switch) — <5 ms transfer time, DSP sampling for fast detection, mechanical drive with active arc-extinguishing, IEC/GB standards compliance; sells on the value proposition “STS-like performance at much lower CAPEX/OPEX”. (Product & spec sheet available).
2. ABB
- Founded: 1988
- Headquarters: Zurich, Switzerland
- Core Products: power transmission & distribution, UPS and static switching, industrial automation
- Links:
- ABB STS overview: https://electrification.us.abb.com/；
- Super Switch4 pages: https://electrification.us.abb.com/static-transfer-switches
ABB is a long-standing global leader in electrification and industrial power equipment. ABB’s static transfer solutions (marketed under ABB and historically via the Cyberex/SuperSwitch family) are engineered for high availability and fault-tolerant architectures in large data-centers and industrial installations. Their SuperSwitch product line covers hundreds to thousands of amps with sophisticated transfer algorithms and redundancy features designed for 24/7 mission-critical operations.
3. Schneider Electric
- Founded: 1836
- Headquarters: Rueil-Malmaison, France
- Core Products: power management, UPS, transfer switches, building automation.
- Links:
- Schneider homepage: https://www.se.com/us/en/
- Schneider static transfer switches: https://www.se.com/us/en/static-transfer-switches/
Schneider Electric combines broad power-management platforms (APC, Square D) with the ASCO transfer-switch legacy it acquired; the group offers both ATS and STS families targeted at data centres, healthcare and industrial sites. Schneider’s STS/transfer-switch portfolio focuses on resilience integrated with EcoStruxure monitoring and site management.
4. Eaton
- Founded: 1911
- Headquarters: Dublin, Ireland
- Core Products: electrical components, power distribution, UPS, and transfer systems
- Links:
- Eaton homepage: https://www.eaton.com/us/en-us.html
- Eaton STS product pages: https://www.eaton.com/us/en-us/eaton-pdi-static-transfer-switch.html.
Eaton is a diversified power-management company with a strong STS offering for data-centre and industrial use. Their static transfer switches emphasise extremely fast transfer times, patented transfer algorithms, modular controls, and hot-swappable electronics to minimise MTTR in high-availability environments.
5. Vertiv
- Founded: 1965
- Headquarters: Westerville / Columbus area (USA)
- Core Products: UPS, thermal management, STS, rack PDUs
- Links:
- Vertiv homepage: https://www.vertiv.com/en-in/
- Vertiv Liebert STS product pages: https://www.vertiv.com/en-in/products-catalog/critical-power/static-transfer-switches/
Vertiv’s Liebert family includes the STS2 static transfer switches widely used in North American and global data centres. Vertiv builds STS products to work tightly with UPS and Liebert distribution systems; key design points are redundancy, low transfer latency and integration with rack and facility monitoring.
6. Socomec
- Founded: 1922
- Headquarters: France
- Core Products: STS, UPS, switchgear, power monitoring and measurement
- Links:
- Socomec homepage: https://www.socomec.us/en-us
- Socomec static transfer solutions: https://www.socomec.us/en-us/c/static-transfer-solutions
Socomec is a European independent specialist in low-voltage availability and control. Their STATYS static transfer systems provide modular STS solutions that are easy to integrate into PDUs or custom cabinets; Socomec emphasises maintainability and IEC compliance for industrial and IT environments.
7. Siemens
- Founded:1847
- Headquarters: Munich, Germany
- Core Products: industrial automation, power systems, critical power equipment
- Links:
- Siemens homepage: https://www.siemens.com/us/en.html
- Siemens / Russelectric transfer solutions: https://www.siemens.com/us/en/products/energy/russelectric/products/transfer-and-bypass-switches.html.
Siemens’ Russelectric brand (within Siemens critical power offerings) provides high-speed transfer and bypass switching equipment for utilities, large industrial plants, and data centres. Siemens focuses on rugged engineering, system-level integration, and customization for complex power systems.
8. Mitsubishi Electric
- Founded: 1921
- Headquarters: Tokyo, Japan
- Core Products: power systems, industrial equipment, UPS, switchgear.
- Links:
- Mitsubishi Electric homepage: https://mitsubishicritical.com/
- Mitsubishi Electric UPS & STS materials — https://mitsubishicritical.com/uninterruptible-power-supplies/paralleling-critical-load-cabinets/. Mitsubishi Electric
Mitsubishi Electric integrates static switching closely into its UPS and critical-power modules. Their systems often use internal STS elements inside UPS modules or critical-load cabinets — appealing for installations seeking a single-vendor UPS+STS architecture with proven service life and global support.
9. Delta Electronics
- Founded: 1971
- Headquarters: Taiwan
- Core Products: power electronics, industrial drives, UPS, STS and PDU hardware
- Links:
- Delta Electronics homepage: https://www.deltapowersolutions.com/en/index.php
- Delta STS pages: https://www.deltapowersolutions.com/en/mcis/data-center-static-tansfer-switch.php
Delta offers compact rack-mount and modular static switches designed for distributed IT and mid-range data-centre deployments; Delta STS units emphasise integrated monitoring, touchscreen interfaces and cost-effective scaling for distributed racks.
10. LayerZero Power Systems
- Founded: 2001
- Headquarters: Aurora, Ohio, USA
- Core Products: static transfer switches, PDUs and mission-critical power panels
- Links:
- LayerZero homepage: https://www.layerzero.com/
- LayerZero STS: https://www.layerzero.com/products/static-transfer-switches/.
LayerZero is a specialist provider focused on mission-critical PDUs and STS devices for modern data centres. As a focused STS vendor they offer high-density eSTS solutions with multiple pole configurations and a claim to high reliability and fast transfer performance for demanding installations.
Why choose HIITIO HTS
For many projects — especially medium-size data halls, commercial buildings, fire-safety circuits and distributed rack deployments — the HTS approach from HIITIO offers a compelling balance of performance, serviceability and price.
Request a datasheet or quote, compare HTS specs head-to-head with STS units for your rated current and transfer characteristics, and evaluate cost of ownership over 5–10 years — you’ll frequently find HTS is the smarter, more economical choice.
