Selection of ABB contactor according to AC-6a application.


The peak of current due to the magnetization phenomena is roughly 20 to 30 times the transformer nominal current.
Please select the contactor and read technical data or find a contactor according to rated power of transformer. Then verify if the possible peak of current is in lie with the current peak from the transformer.
The selection is valid for a maximum switching frequency of 60 operating cycles per hour.

Contactor type :

 
Definitions  
AC-6a Switching of primary of 3-phase transformer.
Ue [V] : Rated operational voltage between phases.
Pe [kVA] : Rated power of transformer.
Ip [A] : Peak current when making of the primary.
n/h : Number of cycles per hour.

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