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Por que relé térmico e não relé de sobrecarga? O relé térmico é um dispositivo utilizado para a proteção de motores elétricos contra sobrecargas. Seu funcionamento está baseado no efeito térmico da corrente elétrica sobre elementos bimetálicos. Internamente, a passagem de uma corrente acima do valor ajustado provoca o aquecimento do bimetal. Com o aumento da temperatura, ocorre a deformação do elemento, acionando o mecanismo de disparo e interrompendo o circuito de comando. A denominação “relé ...
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