Setting the overload on a motor circuit contactor.

[biospark80]

Hi
I haven't much experience on this subject so thought id ask!.
I need to choose and set the overload on a circuit contactor containing an overload. It's a 3ph motor rated at 14.1 amp do i set the overload at the same current rating or just above due to the initial inrush?

 

[Pete999]

Hi
I haven't much experience on this subject so thought id ask!.
I need to choose and set the overload on a circuit contactor containing an overload. It's a 3ph motor rated at 14.1 amp do i set the overload at the same current rating or just above due to the initial inrush?

Overload relay setting and calculation - Electrical Engineering Centre

Anything else I can google for you?

 

[Darkwood]

-What are the starting methods used for the motor? DOL, Star/Delta etc
-If its DOL (Direct on Line) then either the FLC (Full Load Current) of the motor or if your familiar with the motors duty and task then a lower setting may be prefered which help diagnose certain problems early.

 

[Darkwood]

Overload relay setting and calculation - Electrical Engineering Centre

Anything else I can google for you?

The link you post advices poorly, we do not set overloads 5% or 10% higher than FLC or FLA as they put it, this practice stems back to the old dash pot overloads where a certain amount of compensation was done when setting them up.

 

[Spoon]

Hi biospark.
As darkwood has stated. It depends on the starting method.
What method do you have?