Lub tshuab hluav taws xob me me muaj lub tshuab ua haujlwm, kev sib cuag, cov khoom siv tiv thaiv (ntau yam mus txawv tebchaws), thiab arc - tua hluav taws. Nws cov neeg tseem ceeb raug kaw manually lossis hluav taws xob. Tom qab cov neeg sib cuag tseem ceeb kaw, qhov pub dawb -txoj kev mus ncig ua haujlwm kaw lawv hauv qhov chaw kaw. Lub coil ntawm lub overcurrent mus txawv tebchaws chav tsev thiab lub thermal caij ntawm lub thermal mus txawv tebchaws chav tsev yog kev cob cog rua nyob rau hauv series nrog lub ntsiab Circuit Court, thaum lub coil ntawm undervoltage mus txawv tebchaws chav tsev yog kev cob cog rua nyob rau hauv parallel nrog lub hwj chim mov.
Thaum muaj ib qho luv luv Circuit Court lossis overload hnyav, lub armature ntawm lub overcurrent trip unit koom, ua rau lub free -trip mechanism ua hauj lwm thiab disconnecting lub ntsiab Circuit Court. Thaum lub Circuit Court yog overloaded, lub thermal caij ntawm thermal mus txawv tebchaws chav tsev heats li, ua rau lub bimetallic strip khoov thiab actuate lub free-trip mechanism. Thaum lub Circuit Court yog undervoltageed, lub armature ntawm undervoltage mus txawv tebchaws unit tso tawm, kuj actuating lub free-trip mechanism.
