IheIhe mgbawa sekit HM4 nke ọkara-voltajiojijisọlfọ hexafluoride (SF6) gasdị ka ihe na-eme ka ihe gbanyụọ ma na-ekpuchi ihe.
gas SF6nwere njirimara mgbawa dị nro, mgbe ọ na-agbaji ọkụ eletrik na ya, ọ dịghị ihe na-eme ka a gbutuo ya ugbu a, a naghịkwa emepụta oke voltaji ọrụ.
Nke anjirimara magburu onwe yana-eme ka ihe mgbawa sekit ahụ nwee ndụ eletriki ogologo oge.
Ọzọkwa, n'oge ọrụ, ọ nweghị mmetụta na ujo nke akụrụngwa ahụ, ọkwa dielectric, na nrụgide okpomọkụ.
Ogidi ogidi nke ihe mgbawa sekit ahụ, ya bụ, akụkụ nke ụlọ na-emenyụ ọkụ, bụ sistemụ mechiri emechi nke na-enweghị mmezi ruo ndụ niile. Ndụ mkpuchi ya kwekọrọ na ọkọlọtọ IEC 62271-100 na CEI17-1.