A look at two of the main components in a standard panel -- the contactor (or starter) and overload protection devices.
NEMA vs. IEC - There are two commonly used component standards for pump control panels - National Electrical Manufacturers Association (NEMA) and International Electrotechnical Commission (IEC). What are commonly called IEC panels in this country actually are UL panels using IEC-style components. For discussion purposes in this article, we will refer to them as IEC panels.