EN 61008-1 specifies the general requirements and testing procedures for residual current operated circuit-breakers without integral overcurrent protection (RCCBs) for household and similar uses. These RCCBs are designed for circuits with a rated voltage not exceeding 440 V AC and a rated current not exceeding 125 A. The standard covers aspects such as definitions, classifications, characteristics, marking, and constructional requirements, ensuring that RCCBs operate effectively to protect against electric shock by disconnecting the circuit when a residual current is detected. It also details the mechanical and electrical performance tests to confirm compliance with safety and functional standards.