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What is the difference in a C306NN3 and a 10-6530-4 overload relay?

C306NN3 and 10-6530-4 are both 144 amp size 4 overload relays.  

The C306NN3 is a stand alone overload relay complete with line and load lugs and a metal mounting plate.  

The 10-6530-4 is a replacement overload for the AN16 starters and is supplied with line side connecting links for attaching directly to a contactor and mounts on the starter plate