Nkọwa Dị Mkpirikpi:

Usoro HWS21-63 bụ otu n'ime ihe nchekwa akpaka emepụtara naonye sinoasian mepụtara

teknụzụ, na-enye ọtụtụ ọrụ (over unver voltaji, overcurrent, leaking ụwa, real

ngosipụta, njikọta akpaaka na paramita a na-agbanwe agbanwe) na 40-60Hz, ejiri ya mee ihe nke ọma na gburugburu ebe obibi

ọkụ eletrik, ụlọ ọrụ na azụmahịa