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April 29, 2021

A Static Transfer Switch Vs. An Automatic Transfer Switch

A switch is a necessary component to a UPS system to transfer the system to a stable power supply with the current power source goes down. This can be accomplished by one of two different options. One is an automatic transfer switch, and the other is a static transfer switch.

They are ideally used for two different purposes based on the way they work. Choosing the right switch for the job ensures the power is always on in your business.

Automatic Transfer Switch

The automatic transfer switch or ATS is typically used to transfer the power supply from a mail to a secondary or emergency system, including a generator. The switch detects a power drop and then switches to the secondary.

While this happens automatically, it can take as long as 100 milliseconds or longer. This longer transfer period, particularly under big loads, can cause problems for sensitive and critical electronic equipment. In addition, high head and increased maintenance demands due to the switch configuration can be a negative factor.

The Static Transfer Switch

Rather than mechanical parts, the static transfer switch or STS uses a semiconductor to detect even slight changes in power and switch to a more stable power supply. With no moving parts, the STS is extremely fast, completing the switch to the stable power supply in less than 4 milliseconds, even in extreme temperatures and conditions.

Using the STS is essential with any type of critical system or sensitive equipment, as the transfer to the stable power source is virtually instantaneous.

If you need assistance in finding an ATS or STS for your system, call on the experts at EOLA.

(833) 670-1182