The protective characteristics of fuses can also be called melting characteristics, which are the main characteristics of fuses. The melting characteristic represents the relationship between the current passing through the melt and the melting time. It is the same as the protection characteristic of the thermal relay, which is inverse time limit. Among the protective characteristics of the fuse, there is a dividing line between the fusing current and the non-fusing current, and the corresponding current is the minimum melting current IR. It is a current value that when the current through the melt is equal to it, the melt should never melt under the rated current, so IR >Ya'ni.
Minimal erish oqimining eritmaning nominal oqimiga nisbati deyiladi erish koeffitsienti , bu haddan tashqari yukning kichik ko'pligini himoya qilishda sug'urta sezgirligining ko'rsatkichidir. Haddan tashqari yukdan himoya qilish nuqtai nazaridan, u kichikdir, bu kichik bir nechta ortiqcha yuklarga foydalidir. Masalan, kabellar va motorlarni ortiqcha yukdan himoya qilish nuqtai nazaridan, qiymat 1,2 dan 1,4 gacha bo'lishi kerak. Agar qiymat 1 ga yaqin bo'lishi uchun etarlicha kichik bo'lsa, Ie ostidagi eritmaning ish harorati juda yuqori bo'libgina qolmay, balki amper-sekund xarakteristikasidagi xato tufayli eritma Ie ostida ham erishi mumkin, bu ta'sir qiladi. Sug'urta ishlashining ishonchliligini oshirish.
