Our relay conform to IEC standards,and comply with China Compulsory Certificate CCC, CE, UL, TUV and ROHS certificate. JRS4-F range thermal overload relay is used in AC 50/60Hz, rated current 101A-500A in circuit, for protecting AC motor against overload or phase-breaking. Main for constructionmechanical metallurgical and other industries, protect motor against potential overload and phase- ...