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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
125 Amp single phase
NZ $1,350.00

125 Amp single phase

125 Amp ATS
The ATS2PC0125 is a brand new modulized design ATS Automatic Transfer Switch with enclosure. Ideal for residential power systems, with rated current of 125A and rated voltage  240VAC single phase to choose from, it is electrically of manually operated and all parts are made with UL 94V-0 plastic for highest safety standards.
Click here for full spec

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