The China Electrotechnical Society group standard T/CES 178-2022 "Marine Medium Voltage DC Contactor" was proposed by the China Electrotechnical Society, Shanghai Electrical Equipment Research Institute (Group) Co., Ltd., Shanghai Electrical Equipment Research Institute, and China State Shipbuilding Corporation No. 7 The drafting and preparation by the Four Research Institutes and other units has been completed. Based on the development of 4000V marine DC contactor products, this standard proposes and stipulates the specific technical requirements and tests for the classification, performance requirements, test methods, inspection rules, marking, packaging, transportation conditions, etc. of marine medium-voltage DC contactors. requirements and methods. This standard can provide a standard basis for the development of marine DC contactors with rated voltages above 1500V to 4000V, and support the in-depth development and application of electrical equipment in marine medium-voltage DC integrated power systems.