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What is an Automatic Transfer Switch?

Low-voltage automatic transfer switch assemblies provide a reliable means of transferring essential load connections between primary and alternate sources of electrical power. Data centers, hospitals, factories and a wide range of other facility types that require continuous or near-continuous uptime typically utilize an emergency (alternate) power source such as a generator or a backup utility feed when their normal (primary) power source becomes unavailable.

The ATS power transfer controller provides reliable operation of an inverter and AC utility power in one compact device. The ATS switches automatically between the AC utility power and the inverter, while protecting the inverter against external Voltages.

How does an automatic transfer switch work? An automatic transfer switch (ATS) is a self-acting, intelligent power switching device governed by dedicated control logic. The principal purpose of an ATS is to ensure the continuous delivery of electrical power from one of two power sources to a connected load circuit (electrical equipment – lights, motors, computers, etc.). The control logic or automatic controller is typically microprocessor-based and constantly monitors the electrical parameters (voltage, frequency) of primary and alternate power sources.

For example, MOES dual power transfer controller ATS-11KW, is used between an off-grid system and public power. The controller is separately connected with public power, inverter, battery and load. Here are some main features of it.

★Beneficial to Solar or Wind System: When your battery gets low on cloudy or windless days, it will automatically switch to grid power to take over your battery. Fits well for RV and Yacht with the new complement of a standby battery, as well as many more powerful features with the dual solar wind system. Besides, it can also be used for industrial appliances.

★Works like an opposite direction UPS: The ATS controller will switch to grid power when the voltage of batteries is lower than the voltage transfer set points, and it will switch back to battery power itself when the voltage of batteries is higher than recovery set points.

★Automatic selection: Auto-selection between DC 12/24/48V, AC 100-120V 60HZ / 220-240V 50HZ. Users can define the low voltage transfer and recovery set points of the battery. Recovery voltage must be higher than the voltage transfer set points. The Battery type needs be paid attention: Suitable for Sealed, Gel, Lead-acid, Lithium battery and so on.


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