Will A type thermal units or B type thermal units work in lieu of AR type thermal units?

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Issue:
Can A and B Type of thermal units be used instead of AR Heaters?

Product Line:
NEMA and Definite Purpose Contactors and Starters

Environment:
9065 Type S Overload relays

Resolution:
No, these are not interchangeable. The AR thermal units are for use in a bimetallic overload relay where the A & B types are melting alloy style.