pääkytkin
Pääkytkin, in Finnish electrical terminology, is the main switch or main disconnector that controls the power supply to a building or installation. Its purpose is to provide a manual means to completely isolate the installation from incoming power for maintenance, fault clearance, or emergency shutdown. It is not a substitute for overcurrent protection, which is provided by fuses or circuit breakers.
Placement and configuration: The pääkytkin is typically located at the service entrance or inside the main
Ratings and operation: A main switch is specified by its current rating (for example 40–125 A in
Standards and safety: Installation follows national and international standards for electrical installations, such as IEC 60364
Terminology and context: In practice, "pääkytkin" denotes the isolating device that enables safe access to wiring,