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What is the difference between the NEMA Type 12 and a NEMA Type 12K Heavy Duty Safety Switch?

Issue:
Design features

Product Line:
Heavy Duty Safety Switches

Environment:
NEMA Ratings

Cause:
Application

Resolution:
The NEMA Type 12 (AWK suffix) is provide WITHOUT KNOCKOUTS. The NEMA Type 12 is also dual rated for Type 12 and Type 3R applications. 
The NEMA Type 12K (A suffix) is provided WITH KNOCKOUTS in the enclosure. 

NOTE: To use the NEMA Type 12 (AWK suffix) for an outdoor, NEMA Type 3R installation, the drain screw in the bottom endwall of the enclosure MUST be removed upon installation.

 
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