pääsuojauslaitteisto
Pääsuojauslaitteisto, often translated as main protection equipment or service entrance protection equipment, refers to the electrical safety devices installed at the point where electricity enters a building or facility from the utility's distribution system. Its primary function is to protect the electrical installation and its occupants from overcurrents and short circuits. This typically includes a main circuit breaker or a main fuse, which acts as the main disconnect and provides the first line of defense against excessive electrical current.
The main circuit breaker is a resettable device that automatically trips and interrupts the flow of electricity
In addition to overcurrent protection, the pääsuojauslaitteisto may also incorporate other protective functions, such as surge