It is hard to convince a NEMA guy IEC is better and vice cersa.
Last month, we talked about full voltage start pump control panels. We described the various features to look for in the enclosure, the disconnect, and the short circuit protection, be it fuses or a motor circuit protector. This month we will cover the other two main components in a standard panel, the contactor or starter, and the overload protection devices (the heaters or adjustable overloads). In addition, we will go over the single-phase and current unbalance protection offered by panels.
NEMA components are physically larger, which, according to NEMA supporters, make them better. IEC supporters say technology built into IEC components allows them to be smaller and still hold up as well as NEMA components. One thing is for sure - it is hard to convince a NEMA guy IEC is better and vice versa.