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Abstract
Load rating of contactor switches is an important issue for diverse industrial power applications requiring varied connections. This paper presents a simple procedure to evaluate the current-carrying capabilities of contactor switches under overload cyclic stress. An experimental setup is proposed to measure test current, contact voltage drop, and temperature at the contacts and cable connectors. Results are presented for ON–OFF controlled commutated current at 500% and 1000% overload of a contactor in the ON position. The attained results and the criteria for contactors selection in power applications are given.
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