This part of the scope GB/T 14048 is applicable to AC semiconductor controllers and contactors for non motor loads operated by changing the conduction and cut-off states of AC circuits. Typical applications are shown in the usage categories in Table 2. As a controller, it should be able to continuously or within a specified time limit reduce the amplitude of the effective value of the load end AC voltage, but the AC half wave time determined by the applied voltage should remain unchanged. The electrical appliances in this section can be equipped with a series connected mechanical switching device and connected to a circuit with a rated voltage not exceeding 1000 V AC. This section specifies controllers and contactors with or without bypass switch appliances. The semiconductor controllers and contactors involved in this section are generally not used to break short-circuit currents, so it is advisable to use appropriate short-circuit protection appliances (see 8.2.5) as part of the electrical device, but they are not necessary for the controller itself. Therefore, this section specifies the requirements for semiconductor controllers and contactors used in conjunction with separated short-circuit protection appliances. This section is not applicable to the operation of AC and DC motors—— Semiconductor controllers and starters for low-voltage AC motors as specified in GB/T 14048.6; - Electronic AC power controller that meets the requirements of IEC 60146 series standards—— With or without solid-state relays. The contactors and control circuit appliances used in semiconductor controllers and contactors should comply with the requirements of relevant product standards, and the mechanical switching appliances used should comply with the requirements of their respective product standards and the additional requirements of this section. The purpose of this section is to specify the following: a) Characteristics of semiconductor controllers, contactors, and related equipment; b) The conditions that semiconductor controllers and contactors meet in the following aspects: - Operational performance—— Dielectric performance—— Shell protection level (if any)—— Structure; c) Verify the tests and methods used to meet the above conditions; The information provided on the device or in the manufacturer's manual
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