Oil-Immersed Transformer Overload Protection with High Voltage Fuse Detail: PRNT5A-15.5 oil-immersed transformer overload protection with high voltage fuse (hereinafter referred to as the fuse) applied to AC 50 Hz, rated voltage 15.5 KV, rated current indoor - 140A high voltage power system. It must connect in series with XRNT515.5 oil-immersed transformer short-circuit protection backup fuse (hereinafter referred to as the backup fuse) to form a power transformer overload and short circuit protection system, which provide a full range protection. In the full range of protection system the fuse just be used to protect the transformer secondary side short circuit faults and small fault current only. Technical Parameter Outline And Installation Size