STS 1 (Single Phase)
The ELSIPOWER single-phase static transfer switch (STS) series provides uninterrupted power transfer for office systems, medical devices, server rooms, network infrastructure and…
ELSİ GÜÇ SİSTEMLERİ · ELSIPOWER
Static Transfer Switch (STS) Seamless transfer between two sources
ELSIPOWER static transfer switches transfer your load between two independent sources within milliseconds, keeping critical loads running when one source fails.
1 / 3 PhSTS models
2 sourcesIndependent sources
19"Rack option (1 ph)
7/24Technical service
Product range
Static Transfer Switch (STS) models
STS 3 (Three Phase)
The ELSIPOWER three-phase static transfer switch (STS) series provides uninterrupted power transfer for data centers, hospitals, industrial automation systems, server rooms and…
Guide
What is a static transfer switch?
An STS monitors two independent sources and transfers the load to the alternate source within milliseconds using thyristor switches — far faster than mechanical transfer switches.
In dual-UPS designs it lets single-corded critical devices benefit from both UPS systems.
- Transfer within milliseconds
- Sync / async transfer
- Preferred source & manual bypass
- Remote monitoring via RS232/RS485/Modbus
Comparison
STS models
| Model | Phases | Highlights | Best for |
|---|---|---|---|
| STS 1 (single phase) | Single phase | 19" rack option, in-flight transfer, 2 manual bypasses | Server rooms, network, offices, medical |
| STS 3 (three phase) | Three phase | LCD monitoring, Modbus event log, dry contacts | Data centers, hospitals, industry |
Applications
Where are STS used?
- Data centers
- Server & network rooms
- Hospitals & operating rooms
- Banking & finance
- Telecom centers
- Industrial automation
- Airports & transport
- Critical security infrastructure
FAQ
STS FAQ
STS vs ATS?
An ATS uses mechanical contactors (hundreds of ms or more); an STS switches electronically within milliseconds.
Why use STS with two UPS?
It lets single-corded loads be fed from either of two UPS systems without interruption.
Sync vs async transfer?
Synchronous sources transfer seamlessly; otherwise a controlled asynchronous transfer is used.
Hot-swap?
Yes, our single-phase models support hot-swap with internal manual bypass.
Installation and service?
Yes, with 24/7 service.
Not sure which model?
Let our engineers size it for you
Send us your load list or the devices you want to protect; we calculate the required capacity and send your quotation.