Static Transfer Switches
STS (Static Transfer Switches)
Static Transfer Switches (STS) are devices that automatically select the safe one for your load from two independent electricity sources and protect their loads by switching to the secondary source uninterruptedly when they encounter a fault in the primary source.
- 32 – 1250 A
- Current range
- < 4 ms
- Transfer time
- up to 99.5%
- Efficiency
- 2 / 3 / 4 pole
- Switching options
Product range
STS models
3 series · click a model for full specifications and datasheets
STS 2000
STS 2000
Deltron STS, allows instantaneous transfer of power sources to the load. If one power source fails, the STS switches to the back-up power source so fast that the load never recognizes the transfer made.
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STS 3000
STS 3000
Deltron STS, allows instantaneous transfer of power sources to the load. If one power source fails, the STS switches to the back-up power source so fast that the load never recognizes the transfer made.
View details STS 4000
STS 4000
Deltron STS, allows instantaneous transfer of power sources to the load. If one power source fails, the STS switches to the back-up power source so fast that the load never recognizes the transfer made.
View detailsOverview
Why Deltron STS
Industrial facilities and critical information technology require maximum reliability and absolute protection against power supply and load failures. Downtimes today are not acceptable, even during maintenance.
Deltron Static Transfer Switches provide flexibility and maximum protection in the event of a power supply or mains failure.
Your loads will not be affected as it can switch between microprocessor control and sources very quickly. In addition, thanks to advanced communication systems, LCD screen and optional SNMP interface, it is possible to remotely monitor all measurements and parameters and device operating states. Mechanical bypass transfer advantage is provided with STS. It also allows neutral switching with 2/3 or 4 pole options. It protects your load in phase sequence changes that may occur in your utility. Thanks to its thyristor structure, it is resistant to high currents. For this reason, failure rates (MTBF) are very low.
It can be fed from different sources as follows:
- UPS + Mains
- UPS + UPS
- Solar system + Grid
- Generator + Mains
- Generator + Generator
- Generator + UPS
- Grid 1 + Grid 2 (independent dual energy bus)
Static Transfer Switches – frequently asked questions
What sources can a Deltron STS be fed from?
UPS + Mains, UPS + UPS, Solar system + Grid, Generator + Mains, Generator + Generator, Generator + UPS, and Grid 1 + Grid 2 (independent dual energy bus).
How fast is the transfer?
Transfer time is below 4 ms for synchronous sources and below 10 ms for non-synchronous sources, using a "break before make" transfer with zero-current switching.
Which STS model do I need?
STS 2000 is a single-phase, 2-pole, 19" rack-type switch for 32, 63 and 120 A. STS 3000 (3-pole) and STS 4000 (4-pole with neutral switching) are three-phase switches from 50 A to 1250 A.
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Reliable Energy Starts with Deltron
Need support or want to discuss your power protection needs? Our engineers will size the right UPS, stabilizer or transfer switch for your application.
