Takaitaccen Bayani:

1. Aikace-aikace: Don kare igiyoyi da kayan aiki daga wuce gona da iri da gajeren kewaye.

2. Gabaɗaya dokoki don zaɓar MCB.

a. Bayanan fasaha na cibiyar sadarwa a wurin da aka yi la'akari: The earthing tsarin, short-kewaye halin yanzu a circuit breaker shigarwa batu, wanda dole ne ko da yaushe zama kasa da karya iya aiki na wannan na'urar, cibiyar sadarwa al'ada ƙarfin lantarki.

b. Akwai halaye masu lanƙwasa guda 3 don aikin maganadisu: B curve(3-5 In) kariya da sarrafa kebul na igiyoyi masu tsayi a cikin tsarin TN da IT.

c. lankwasa (5-10 In) kariya da kula da da'irori daga wuce gona da iri da gajerun kewayawa; kariya ga masu juriya da naɗaɗɗen kaya tare da ƙarancin inrush na halin yanzu.

Drcurve (10-20 In) kariya da sarrafa da'irori game da wuce gona da iri da gajerun kewayawa; kariya ga da'irori wanda ke ba da kaya tare da babban inrush na halin yanzu a rufewar da'irar (Transfoman LV/LV, fitilu masu fashewa).