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A transfer switch is an electrical switch that reconnects electric power source from its primary source to a standby source. Switches may be manually or automatically operated.
An Automatic Transfer Switch (ATS) is often installed where a backup generator is located, so that the generator may provide temporary electrical power if the utility source fails.
As well as transferring the load to the backup generator, an ATS also commands the backup generator to start, based on the voltage monitored on the primary supply. The transfer switch isolates the backup generator from the electric utility, when the generator is on and is providing temporary power. 

Reliably transfer loads to emergency sources with automatic transfer switches and non-automatic transfer switches.
Auto changeover switch's are best used in unmanned or remote operations and are more efficient way to operate between different power sources
Generator automatic transfer switch are the most common in industry but  these can be used in applications where houses have a main grid supply and a battery back up system to give isolation from one source to the other manual transfer switches are more common in this situation  
4 pole ATS is common for the Generator supply and 3 pole ATS for the main supply 
New Zealand Automatic Transfer Switches  Click Here for Selection Chart
400 AMP ATS (Automatic Transfer Switch)
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400 AMP ATS (Automatic Transfer Switch)

  MCCB Type Automatic Transfer Switch
  Rated Current 250~400A Voltage 100~600VAC
  •   Extraordinary Modularized ATS Design

  •  Superior Serviceability & Simple Maintenance

  •  ATS-01 Intelligent Controller—Voltage Monitoring &   
         Protection with Built-in 168HR Exerciser Timer

  •  TSP-01 Voltage Transformer Module—
         Change Voltages Easily by Plug-In Connectors

  •  BTS—Transfer Switch Built with High Short Circuit
         Breaking Capacity & OCPD

  •  All Modules Connected by Harness with
         High Withstand Voltage Plug-In Connector Sets

  •  Complies with IEC 60947-6 Requirements

Full Spec Click Here

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