This guiding technical document specifies the general requirements and methods for reliability verification testing of small capacity AC contactors (hereinafter referred to as contactors), including reliability indicators, testing methods, testing plans and procedures, test records and reports, and reliability testing with electrical loads. This guiding technical document is applicable to the reliability verification test of contactors with AC 50 Hz or 60 Hz, rated working voltage of the main circuit not exceeding 690 V, rated working current of the main circuit 50A and below, and rated control power supply voltage ranging from 24V to 400 V. The reliability verification test of contactors with a rated working current of more than 50 A in the main circuit can also be conducted according to this guiding technical document. This guiding technical document can serve as a guiding document for contactor manufacturing enterprises to conduct product reliability tests. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. GB/T 2900.13-2008 Electrotechnical Terminology - Reliability and Service Quality GB/T 2900.18-2008 Electrotechnical Terminology - Low Voltage Electrical Appliances GB/T 5080 (All Parts) - Equipment Reliability Testing GB 14048.1-2012 Low Voltage Switchgear and Control Equipment - Part 1: General GB 14048.4-2010 Low Voltage Switchgear and Control Equipment: Part 4-1: Contactors and Motor Starters - Electromechanical Contactors and Motor Starters (including Motor Protectors) -3 Terms and Definitions, Symbols 3.1 Terms and Definitions GB/T 2900.13-2008, GB/T 2900.18-2008, GB/T 5080 (all parts), GB 14048.1-2012, and GB 14048.4-2010, as well as the following terms and definitions, apply to this document. 3.1.1 Failure rate The probability of failure occurring per unit time after a product works to time t. 3.1.2 Time or Failure Curtailed Test Plan: During the test period, the test sample is continuously or periodically monitored. If the cumulative relevant test time reaches the predetermined test cut-off time but the number of related failures does not reach the predetermined cut-off failure number, it is deemed accepted; If the cumulative relevant test time does not reach the predetermined test cut-off time, and the number of related failures reaches the predetermined cut-off failure number, it is considered rejected. Note: In this guiding technical document, the unit of "time" related to reliability values can be replaced by "number of times", such as cumulative relevant test times, relevant test times
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