Moulded case Circuit Breakers yog hom hluav taws xob qis hluav taws xob, tseem hu ua ntaus ntawv-hom hluav taws xob hluav taws xob. Hom hluav taws xob hluav taws xob no kaw tag nrho cov khoom hauv lub plhaub yas, thiab cov kev sib txuas sib txuas, kev tso tawm hluav taws xob, thiab shunt tso tawm feem ntau yog cov qauv tsim. Vim nws cov qauv compact heev, molded case circuit breakers yeej tsis tuaj yeem kho sab hauv, thiab feem ntau ntawm lawv yog manually ua. Rau cov qauv muaj peev xwm loj, hluav taws xob sib cais thiab kaw tuaj yeem xaiv.
Tsis tas li ntawd, raws li daim ntawv thov ntawm cov hluav taws xob overcurrent tso tawm, molded case Circuit Court breakers tuaj yeem muab faib ua Class A thiab Class B. Class A molded case circuit breakers feem ntau yog siv thermal magnetic tawm, uas tsis yog xaiv Circuit Court breakers thiab feem ntau muab ob kev tiv thaiv hom: ntev overload ncua thiab luv luv Circuit Court instantaneous; thaum Class B molded case circuit breakers muaj cov yam ntxwv tiv thaiv peb-theem zoo (ntev dhau sijhawm ncua sijhawm, luv luv Circuit Court ncua sijhawm, luv luv Circuit Court instantaneous), thiab qee cov khoom kuj tseem muaj kev tiv thaiv hauv av, thiab txawm tias muaj kev xaiv sib cuam tshuam hauv cheeb tsam. Txawm li cas los xij, vim yog tus nqi ntawm cov khoom, Class A cov khoom siv thermal magnetic tso tawm feem ntau muaj kev lag luam ntau dua.