What is sfu - switch fuse unit or sdf- switch disconnector fuse.

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switch fuse unit (SFU) कैसे काम करता है || SFU की पूरी जानकारी हिंदी में ||Switch disconnector fuse

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Why use switch-disconnector-fuse STV D02

switch fuse unit || SFU क्या हैं इसका उपयोग कहा किया जाता है switch disconnected fuse