JB 8591.2-1997 This standard complies with the requirements of GB 14048.4-1993 "Low-voltage electromechanical contactors and motor starters for low-voltage switchgear and control equipment". This standard specifies the basic rules and requirements for the use of CJ26 and CJ28 series AC contactors. It includes: terminology, characteristics, normal working and installation conditions, structural and performance requirements, verification of characteristics and performance; it also specifies the parameters that should be marked on the contactor or the data that should be provided by the manufacturer, as well as packaging, transportation and storage requirements. This standard applies to CJ26 and CJ28 series AC contactors. This series of contactors are mainly used for making and breaking circuits in power systems with AC 50Hz, rated voltage up to 660V, current CJ26 series contactors up to 32A, and CJ28 series contactors up to 475A. , and combined with appropriate thermal overload relays to protect circuits that may be overloaded during operation. (Note: This standard is equivalent to IEC 947-4-1.)