This part of the scope GB 16916 specifies the terms and definitions, technical requirements, and tests for various types of RCCB. This section applies to residual current operated circuit breakers (RCCBs) without overcurrent protection for household and similar purposes, with an AC rated frequency of 50 Hz. 60 Hz or 50/60 Hz, a rated voltage not exceeding 440 V., a rated current not exceeding 125A, and an action function unrelated to or related to the power supply voltage. RCCB is used for indirect contact protection of people. At this time, the exposed conductive parts of the equipment should be connected to a suitable grounding electrode. They can also provide protection against fire hazards caused by the continuous presence of ground fault currents on the non operating surface of overcurrent protection devices. RCCB with a rated residual operating current not exceeding 30mA can also be used as a supplementary protection measure when other electric shock protection measures fail. This section is applicable to devices that can simultaneously detect residual current, compare residual current value with residual operating current value, and disconnect the protected circuit when residual current exceeds residual operating current value. Note 1: The technical requirements of RCCB comply with the general requirements of GB/Z 6829, mainly for non professional personnel, No maintenance is required. RCCB can be used to submit certification. Note 2: The installation and usage regulations of RCCB are specified in GB 16895. RCCB is expected to be used in pollution level 2 environments. RCCB is suitable for isolation purposes. Except for RCCBs with non interruptible neutral wires, RCCBs that comply with this section are applicable to IT systems. When excessive overvoltage is prone to occur on the power supply side (such as when the power supply is introduced through overhead lines), special protective measures can be taken (such as using lightning arresters) (see GB 16895.12). General RCCB error resistant tripping refers to the generation of load current in the equipment without flashover due to surge voltage (generated by transient overvoltage or lightning induction during operation). The S-type RCCB has sufficient resistance to false tripping even when the surge voltage causes flashover and generates residual current. Note 3: Surge absorbers installed behind general RCCBs and connected in a common mode may cause false tripping. Note 4: For RCCBs with a protection level higher than IP20, special structures may be required. The following products must be supplemented with special requirements: residual current operated circuit breakers with overcurrent protection (see GB16917.1); RCCB for plugs, catch seats, or appliance connectors for household and similar purposes, or RCCB specifically designed for use in combination with them; One - and RCCB expected to be used in frequencies other than 50Hz or 60Hz. The technical requirements of this section can be used in conjunction with GB2099.1 or the relevant requirements of the country where the product is placed on the market, when applicable, for RCCBs installed in human sockets or specifically assembled with sockets. Note 5: For RCCBs installed in human sockets or specifically assembled with sockets, they can comply with GB 28527-2012 or comply with the wooden part. The technical requirements of this section are applicable to normal environmental conditions (see 7.1). For RCCBs used in harsh conditions, necessary technical requirements can be supplemented