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Within a data centre or computer room, an Automatic Transfer Switch (ATS) can switch a load between two sources, e.g. mains and a backup generator so that the generator may provide temporary electrical power if the utility source fails.

An ATS may also command the backup generator to start, based on the voltage monitored on the primary supply. The transfer switch isolates the backup generator from the electric utility when the generator is on and providing temporary power.

RT systems offers ATS solutions from Zonit.

Micro-Automatic Transfer Switch (μATS™)
zPDS (Data Centre Power Distribution System)

Micro-Automatic Transfer Switch (μATS™) from Zonit


Have a highly functioning transfer switch at the rack, taking “no” rack space, and provide redundant A-B power to single power input devices!

The μATS is the world's smallest and most efficient capable automatic transfer switch for data centre equipment. It enables a completely different approach to the deployment of power in the data centre. The device is a zero "U" self-mounting device that is designed to auto-switch the power fed to electronic data processing equipment. 

The Zonit μATS™ solves many common problems with power distribution and enables new and highly efficient patent pending methods of power distribution. The Zonit µATS™ has five primary usage scenarios:  

  • Redundancy – Enables redundant power feeds for single power cord devices. 
  • 99.9% efficient power distribution – Saves 3–15% of annual data centre power costs.
  • Increase UPS efficiency by 3–5% – Saves 3–5% of UPS power conversion losses.
  • Cost effective N+1 reliability – Eliminates the need for seond power supplies in N+1 horizontal server tiers.
  • Relocation flexibility – Allows easy “hot moves” to relocate powered-up equipment. Ideal for doing deployments that are temporary or will be moved at a later date.

The Zonit μATS™ is available in both 12A at 120V and 8A at 208V-240V versions.

Why use the µATS?

The µATS™ allows single power supply devices in the data centre to be connected to redundant A-B power sources. This eliminates one of the primary causes of downtime, human error. Much downtime is caused by people plugging in one too many devices to a branch circuit, causing its circuit breaker to trip. 

The Zonit µATS™ is very useful to increase the service level availability of common single-power devices such as network distribution switches, firewalls, and other equipment that may be in a mission-critical service path, sometimes unknowingly. 

The µATS™ enables much easier maintenance of redundant power systems, since one source can be taken off-line if all single power supply devices are fed via µATS™ units. 

Distribution closets with single power supply network switches especially benefit from the Zonit µATS™, because it enables a UPS unit in that closet to be taken off-line for battery testing and maintenance during regular business hours without network service downtime.

99.9% efficient power distribution

The Zonit Micro ATS (μATS) enables 99%+ efficient power distribution methods in the data centre. It allows data centre devices to be preferentially connected to filtered utility power on the A-side and an Uninterruptible Power Supply (UPS) on the B-side, which is only used when A is down. Eliminating UPS power conversion losses saves 3-15% of data centre power usage compared to redundant UPS designs, which can save millions of dollars in energy costs. The µATS™ is 99.75% efficient, using only 125mA in normal operation. This maximises data centre Power Utilisation Efficiency (PUE).

Modern computer power supplies are almost all auto-ranging (accept 110-240V input) and all switched (draw on the Alternating Current [AC] input power for just a short period of time and then convert this energy to Direct Current [DC], then repeat). Power supplies of this type are more resistant to power quality problems, because they only need to “drink” one gulp at a time, not continuously. If the input AC power voltage range is controlled within a known range, they will function very reliably. They do not require perfect input AC waveforms to work well. All that is necessary is that they receive sufficient energy in each “gulp” and that the input power is within the limits of their voltage range tolerance. This makes it possible to use a data centre power distribution system that is much more efficient than a fully UPS supplied power system at a very reasonable capital expense.

The power system design shown above controls voltage ranges very well. It has been in use for many years. The Zonit µATS™ enables new power distribution methods coupled with this power system design that are very efficient.