🌐EnglishEnglishBahasa IndonesiaDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsTürkçeРусскийالعربيةفارسیहिन्दी中文EntityQ619617· pop 24· linked from 72 articlesBuchholz relaysafety device for oil-filled electrical transformersConnectionselectric arcEntityInternational Standard Book NumberEntityCategoriesElectric transformersGerman inventionsRelaysSafety switches