CAN'T FIND 502.6(B)
THIS IS AN ENCLOSED MAGNETIC SWITCH. SEE SECTION 502.150(B)1 AND 502.150(A)(2).EXCEPTION WITH THIS SWITCH BEING LOW VOLTAGE AND HAVING A SEALED HOUSING IT LOOKS LIKE I CAN USE A "GENERAL PURPOSE DEVICE".
I can understand why you didn't find 502.6(B) - it doesn't exist. Sorry. I should have referenced 502.115(B).
Is your application Signaling, Alarm, Remote-Control, and Communications Systems; and Meters, Instruments, and Relays? You may want to reread the exception.