IEC 61009-1 standard published by the International Electrotechnical Commission (IEC), for household and similar uses, with integrated surge protection, functionally independent or functionally dependent from line voltage, residual current operated, rated frequencies of 50 Hz, 60 Hz or 50/60 Hz It applies to circuit breakers for rated voltages not exceeding 440 Volts alternating current and rated currents not exceeding 125 Amperes and rated short-circuit capacities not exceeding 50 thousand Amps for operation at 60 Hz or 25 Hz.
-bolum-1-genel-kurallar.jpg "IEC 61009-1 Residual Current Circuit Breakers (RCBOs) with Integrated Overcurrent Protection for Household and Similar Uses - Part 1: General Rules")
These devices are intended to connect the exposed conductive parts of the installation to a suitable earth electrode and to protect the wiring of buildings and similar applications against overcurrents. They can be 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 means of protection against electric shock.
The IEC 61009-1 standard is applied to devices that simultaneously perform the function of detecting the residual current, comparing the value of this current with the residual operating value and opening the protected circuit when the residual current exceeds this value, and at the same time performing overcurrent, carrying and breaking operations under certain conditions.
RCBO is an abbreviation formed from the initial letters of the English phrase meaning residual current circuit breaker with overcurrent protection.
Essentially, the IEC 61009 standard consists of two parts:
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