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Here are some tips for choosing an automatic transfer switch (ATS) for your application:
Determine the amperage and voltage requirements for your critical loads. This will dictate the size and ratings you need for the ATS. Know the starting KVA and running amps of the largest motor or load.
Decide whether you need a service entrance rated transfer switch. These are for installing directly after the power meter and provide overload protection.
Choose between a single or three phase ATS configuration depending on your power system.
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<img style="display: block; margin-left: auto; margin-right: auto;" src="https://first-fish.oss-us-west-1.aliyuncs.com/file/157/electrical-transfer-switch.jpg" alt="Electrical Transfer Switch" width="712" height="528">
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Determine if you need just transfer capability (open transition) or transfer between live sources (closed transition). Closed transition allows a seamless transfer.
Select the number of poles (2, 3 or 4) to match the phases being connected.
Look for IEC-60947 certification and features like in-phase monitoring, time delays, exercisers, and durable contact material.
Consider any additional features needed like surge protection or network connectivity.
Make sure the ATS has enough amp capacity for the loads and has overcurrent protection if service entrance rated.
Select all suitable enclosures, mounting provisions and conduit entry points.
For generators, make sure <a style="color: rgb(53, 152, 219);" href="https://csqelectric.com/products/automatic-transfer-switches-ats">ATS</a> voltage and frequency tolerances match the generator specifications.
Consider the sequence of operations and priorities carefully as well to ensure proper emergency system functioning when specifying and installing the ATS.

How Do I Choose An Automatic Transfer Switch?

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