Auto Generator Transfer Switch (ATS)

1.     3 incoming + 1 outgoing :

It is used to feed the house with the electrical current from three lines (sources). All are single phase.

- The 1st come from the national network (NN),

- The 2nd come from the local area generator (AG),

- The 3rd come from the house generator (HG).

2.     The priority :

The priority in supplying to the house (load) is as follows:

No.1  to the national electrical network (NN), if it exists, even if the other two sources are also exist.

No. 2  to the local area generator (AG ) , when (NN) doesn’t exist, and even if (HG) exists.

No. 3  to the house generator (HG), when both (NN) & (AG) don’t exist.

- NN     operated by the government, to supply the city zones, each for a limited time in the day.

- AG     operated by the private companies to supply the zones of the city with the electricity, also for a limited time in the day.

- HG     operated by the owner of the house (citizen) , at the time when both  (NN) & (AG ) don’t exist.

3 - Consists of :

A - power relays, 

B - metallic box, 

C - connectors,

D - indication lamps (or LED) ,

E - additional auxiliary contacts ( 1 NO + 1 NC ) , to stop the generator of the house.

4 - The rated current : 30 A

5 - The coils voltages : 220 V AC