Ndi Mulingo Uti Wotsimikizira Kuphulika Ndi Wapamwamba, AT1 kapena BT4

Gulu la IIB lotsimikizira kuphulika limaposa IIA, ndipo gulu la kutentha la T4 limapereka kutentha kochepa komanso kotetezeka kuposa T1. Choncho, BT4 ili ndi mavoti apamwamba kwambiri osaphulika.

III	C	Mtengo wa 135 ℃	Db	IP65
III Fumbi pamwamba		T1450 ℃	Mayi	IP65
		T2 300 ℃	Mb
		T3 200 ℃
	A Zouluka zoyaka moto		Ndipo
		T4 135 ℃
			Db
	B Non conductive fumbi	T2 100 ℃	Dc
	C Fumbi la conductive	T685℃

Gulu lililonse losaphulika limatsata zolinga zachitetezo. Zambiri zitha kupezeka pofufuza pa Shenhai Explosion Proof.