Static Transfer Switches

Uninterruptible power supplies (UPS) are a vital part of critical electrical infrastructure, however, how do you maintain electrical power and keep your critical systems running in the unlikely event of a UPS output failure?

Cetronic Power supply static transfer switches (STS) – also referred to as a UPS transfer switch – to seamlessly switch/transfer power from one supply source to another.

What are Static Transfer Switches?

Static transfer switches provide ultra-fast switching between synchronised input power supplies, providing you with uninterrupted power for your mission critical load. Meaning you don’t need to shut the system down to carry out maintenance work.

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An STS switch has three major parts:

  • Controls and metering
  • Silicon-controlled rectifiers
  • Breaker assemblies and bypass switches

Why are UPS Transfer Switches needed?

The UPS transfer switch is designed to protect against a failing power source. The switch provides an automatic transfer from the “preferred” source to an alternate or backup source in the event of source failure – offering true power continuity.

A static transfer switch will ensure your critical load operates smoothly. It monitors two power supplies and switches automatically to the alternative supply if the preferred source is compromised. The STS switch is extremely reliable – detecting power failure and switching within milliseconds.

How do Static Transfer Switches work?

Our STS transfer switch can be set to use source A or B as its primary/preferred supply for the critical load. If the selected source fails, the STS automatically transfers to the alternative source. When the primary source returns, the STS can be set to automatically re-transfer (with a timer) the load back to the preferred source, or the system can be set to await manual operation.

We provide single and three phase systems with 3 or 4 pole switching. They’re available in power ratings from 16A to 800A with manual bypass mechanisms and an LCD screen which provides status, metering and alarm information.

Get in touch

For more information about the STS transfer switch, don’t hesitate to contact the team, here at Cetronic Power. We are always on hand to help and will be more than willing to share our expertise. Call us on 01920 871 077 or email us at today.

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Single Phase Static Transfer Switches

Multi Switch 16A

The Multi-Switch provides electrical distribution and remote management for up to eight output power sockets. Multi-Switch can connect each socket (load not greater than 3A each) to either of the two power sources (A or B). Load demand is shown on the LCD.


Multi Switch ATS 16A

The Multi Switch ATS provides output power via 8 x 10A and 1 x 16A IEC socket. The power is derived from one of two input power sources. If the primary power source fails, the Multi Switch ATS will automatically transfer the load to the second power source.


Master Switch STS 32A – 120A

The Master Switch STS ensures transfer time between the two single phase power sources is less that a quarter of a cycle in the event of a failure of the primary power source. All models are equipped with a manual bypass and a hot swap function.



Three Phase Static Transfer Switches

Master Switch STS 100A – 600A

The Master Switch STS is a 3 phase (3 or 4 pole) static transfer switch commonly used within power continuity applications to improve and enhance resilience. The system can be used in conjunction with UPS groups or as separate standalone devices.