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Within the catalogs in the characteristics section for the RPF relays, it mentions that for the Rated operational current in utilisation categories AC...

Goals and Symptoms

Within the catalogs in the characteristics section for the RPF relays, it mentions that for the Rated operational current in utilisation categories AC-1 and DC-1: Conforming to IEC N/O=30A N/C=3A Conforming to UL 30A. Why is so big the difference between N/O and N/C ratings in IEC?

Causes and Fixes

The NO contact is dedicated to switch power loads.
The NC contact is dedicated for low power control (PLC, pilot light...)

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