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What does the Trip Class 10, Class 20, and Class 30 mean for overload relays?

Product Line:
NEMA style Overload Relays

That at 600% of the maximum thermal unit current rating or 600% of the actual dial setting on adjustable range OLR`s the Class 10 will trip in 10 seconds or less, Class 20 will trip in 20 seconds or less, and Class 30 will trip in 30 seconds or less.

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