BS IEC 62873-2:2016 pdf download.Residual current operated circuit-breakers for household and similar use
3.3.3 circuit-breaker
mechanical switching device, capable of making, carrying and breaking currents under normal circuit conditions and also making, carrying for a specified duration and breaking currents under specified abnormal circuit conditions such as those of short-circuit [SOURCE: lEC 60050-441:2000, 441-14-20]
3.3.4 fuse
a device that by the fusing of one or more of its specially designed and proportioned components,opens the circuit in which it is inserted by breaking the current when this exceeds a given value for a sufficient time. The fuse comprises all the parts that form the complete device[SOURCE: IEC 60050-441:2000, 441-18-01]
3.3.5 residual current device
RCD
mechanical switching device or association of devices designed to make, carry and break currents under normal service conditions and to cause the opening of the contacts when the residual current attains a given value under specified conditions[SOURCE: IEC 60050-442:1998, 442-05-02, modified -“or association of devices" has been inserted and the Note has been deleted.]
3.3.6 detection
Note 1 to entry: This function can be performed, for example, by a transformer integrating the vector sum of the currents.[SOURCE: IEC 60050-442:1998, 442-05-24]
3.3.7 evaluation
3.3.8 interruption
3.3.9 r.c. unit
device performing simultaneously the functions of detection of the residual current and of comparison of the value of this current with the residual operating value, and incorporating the means of operating the tripping mechanism of a circuit-breaker with which it is designed to be assembled or associated
3.3.16 limiting non-actuating time
maximum delay during which a value of residual current higher than the residual non-operating current can be applied to the RCD without causing it to operate[SOURCE: IEC 60050-442:1998, 442-05-23, modified - In the definition, "bringing it actually" has been replaced by "causing it".]
3.3.17 time-delay RCD
RCD specially designed to attain a predetermined value of limiting non-actuating time,corresponding to a given value of residual current [SOURCE: IEC 60050-442:1998, 442-05-05]
3.3.18 reset RCD
residual current device which must be intentionally reset prior to reclosing by a means different from the operation means to be able to be reclosed and to operate again [SOURCE: IEC 60050-442:1998, 442-05-10, modified一In the definition, "prior to reclosing"has been introduced, "operating" has been replaced by "operation", and "to operate on the occurrence of a residual current" has been replaced by "to be reclosed and to operate again".].BS IEC 62873-2 pdf download.