Zoletsa kuthamanga kwa magetsi otsika a Yuanky zimateteza mizere yotsika yamagetsi, zinthu zomwe zimagwiritsidwa ntchito ndi ogula, ma transformer ogawa ndi machitidwe ena. Varistor yopanda mipata yachitsulo-oxide yomwe imayikidwa mu surge arrester imayika malire otsika pa ma surges omwe amayambitsidwa ndi overvoltages yamlengalenga ndi ma transient osinthasintha, motero imateteza kutenthetsa kwa ma network ndi zida za ogula. Varistor ili ndi nthawi yochepa kwambiri yoyankhira (nthawi zambiri imakhala yofanana ndi ya 100%).<100 ns) ndipo imatha kuthana ndi ma impulses amphamvu mpaka 100 kA, 4/10 μs. Mphamvu yotulutsa ya arrester ndi 10 kA. Varistor ya metal-oxide ili mkati mwa nyumba yolimba ya polymer, yosagwedezeka ndi nyengo. Mayeso ambiri atsimikizira kulimba kwa nyumbayo, ngakhale ikakumana ndi kusintha kwakukulu kwa kutentha ndi kuipitsidwa. Ma LV surge arresters akutsatira zofunikira za Gulu II monga momwe zafotokozedwera ndi IEC 61643-1.