IEC 61009-2-1 standard published by the International Electrotechnical Commission (IEC), rated voltages not exceeding 440 Volts alternating current operating with residual current, with integrated overcurrent protection (RCBOs) functionally independent of the line voltage, for household and similar uses with overcurrent protection Applies to circuit breakers designed for rated currents not exceeding 125 Amperes, rated short-circuit capacities not exceeding 25 thousand Amperes and for operation at 50 Hz or 60 Hz.
-bolum-2-1.jpg "IEC 61009-2-1 Residual Current Circuit Breakers (RCBOs) with Integrated Overcurrent Protection for Household and Similar Uses - Part 2-1: Applicability of General Rules to RCBOs Functionally Independent of Line Voltage")
These devices are for protecting people from indirect contact, connecting the exposed conductive parts of the installation to a suitable earth electrode, and protecting the wiring of buildings and similar applications against excessive currents. It is used to protect against fire hazards due to a permanent earth fault current without the operation of the overcurrent protection device.
RCBOs with a rated operating current not exceeding 30 mA are also used as a means of additional protection in case of failure of the protective means against electric shock.
This standard applies to devices that simultaneously perform the function of detecting the residual current, comparing its value with the residual operating value, and opening the protected circuit. The content of the current standard for operation under residual current conditions is based on the IEC 61008 standard. The content of the current standard for protection against overcurrents is based on the IEC 60898 standard.
Residual current-operated circuit breakers (RCBOs) with overcurrent protection are designed primarily to be operated by untrained persons and to be maintenance-free. The installation and application criteria of RCBOs are included in the IEC 60364 standard.
In general , RCBOs are resistant to unwanted tripping, including situations where overvoltages, i.e., transients, or voltages induced by lightning cause load currents without a flash occurring in the installation.
RCBOs within the scope of this standard are considered suitable for isolation.
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