ʻO ka wehewehe pōkole:

1. Noi: No ka pale ʻana i nā uwea a me nā mea hana i ka overload a me ka pōkole pōkole.

2. Nā lula maʻamau no ke koho ʻana iā MCB.

a. ʻIkepili ʻenehana o ka pūnaewele ma kahi i manaʻo ʻia: ʻO nā ʻōnaehana honua, pōkole kaapuni i ka wahi hoʻonohonoho kaapuni, pono e emi mau ma mua o ka haki ʻana o kēia hāmeʻa, ka uila uila maʻamau.

b. Aia he 3 mau hiʻohiʻona pihi no ka hana magnetic: B curve(3-5 In) pale a me ka hoʻomalu ʻana i nā kaapuni i nā kaula lōʻihi ma nā ʻōnaehana TN a me IT.

c. curve(5-10 In) ka pale a me ka hoomalu ana i na kaapuni i ka oi aku a me na kaapuni pokole; pale no ka haawe resistive a me inductive me ka haʻahaʻa inrush au.

ʻO Dcurve(10-20 In) ka pale a me ka hoʻomalu ʻana i nā kaapuni e kūʻē i nā kaumaha nui a me nā pōkole pōkole; pale no nā kaapuni e hāʻawi ana i nā ukana me ke kiʻekiʻe o ka inrush i ke kaʻapuni pani (LV/LV transformers, nā kukui wāwahi).