• Craig Drabyk

What is an ATS/Auto-Transfer Switch?


An automatic transfer switch, or ATS, is an electrical switch that monitors utility power for failure and automatically moves a load to a generator or other emergency power source during an outage. ATS are absolutely essential for large healthcare and mission-critical loads.

Today’s ATS range in size and capability, from small 30-amp residential units to 5,000-amp switches for large commercial and industrial applications. Many generator manufacturers produce their own ATS switches. Most ATS are stand-alone in their own enclosure, but can be installed in a motor control center or substation lineup.


Automatic transfer switches come in a variety of configurations with a broad range of functional options depending on application. Many provide seamless continuity of power during power transfer as well as preventive maintenance, switch inspection and testing, and system exercise, which must be performed regularly. Most ATS are fully programmable, and can offer a whole host of sequencing and monitoring options. Operation can be monitored through the BAS system, which can shut down or shed excess load and run an alternative sequence of operation when the building is on emergency power. Multiple ATS and generators can be linked via an Ethernet network.


Omni can educate clients on the many automatic transfer switch options that are available and help them make the best choice for their specific requirements. For information, contact Omni at 908-412-7130.


About Omni

Omni Instrumentation & Electrical Services, Inc., located in New Jersey and Maryland, is a premier instrumentation and electrical contractor, providing superior total care solutions since 1986. Services include instrument installation, tubing installation, instrument calibration, control loop testing, startup and commissioning, power and lighting, process control wiring, BMS wiring, telecommunications and data wiring, fire alarm wiring, security wiring, process network wiring, and control panel fabrication. Omni Instrumentation & Electrical Services, Inc., is certified in Foundation Fieldbus, Profibus, DeviceNet and ASI-Bus installation.

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