AC-1 vs AC-3 vs AC-6a: Contactor Utilization Categories Explained
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A utilization category is the IEC 60947-4-1 code stating what kind of load a contactor is proven to switch. The same contactor carries a different amp rating in each category — typically Ith ≥ AC-1 ≥ AC-3 ≥ AC-4 — because switching resistive load is far easier than switching a motor. An amp figure...