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Critical Power Application Guide A closed transition ATS, also called a closed transition transfer switch or CTTS, uses a controlled make-before-break sequence. When two power sources are available and suitably…

Commercial & Compact Backup Power Guide An open transition ATS, also called an open transition automatic transfer switch, disconnects the load from one source before connecting it to the alternate…

Choosing an automatic transfer switch instead of a manual transfer switch is not simply a question of buying the more advanced device. For a generator panel, commercial building, factory, control…

Compact DIN-rail ATS buyer guide When buying a compact automatic transfer switch, checking only “63A” or “2P / 4P” is not enough. A B2B buyer should confirm what the ATS…

Generator Backup ATS Guide An ATS generator backup system has two separate jobs that are often confused: the generator must become an available backup power source, and the automatic transfer…

Compact ATS Bulk Buying Guide Automatic transfer switch prices vary widely because the term “ATS” covers very different products. This guide focuses specifically on compact DIN-rail automatic transfer switches such…

IEC 60947-6-1 ATS Buyer Verification Guide IEC 60947-6-1 is the principal IEC product standard for transfer switching equipment used to transfer a load between power sources. For an ATS buyer,…

Automatic transfer switch sizing starts with the current that will actually pass through the ATS, but it does not end there. A reliable selection must also consider maximum demand, continuous…

Choosing a 3P or 4P automatic transfer switch for a three-phase system is mainly a neutral and earthing decision, not a voltage-label decision. A 380 V, 400 V or 415…