Wholesale Fuse Cutout, Fuse Cutout Manufacturer

In electrical distribution systems, the fuse cutout is really important. It combines a fuse and a switch and is used in primary overhead feeder lines and taps to protect distribution transformers from current surges and overloads.

When a fault happens in the transformer or customer circuit, an over current occurs. This makes the fuse in the cutout melt and disconnect the transformer from the line, stopping further damage to the transformer. Utility linemen can also open the fuse cutout manually while on the ground, using a long insulating stick called a "hot stick".

Fuse Cutout Components

● The Cutout Body:

It's an open "C"-shaped frame that supports the fuse holder. There's a ribbed porcelain or polymer insulator on it, which electrically isolates the conductive parts of the assembly from the support it's attached to, ensuring proper electrical flow and safety.

● The Fuse Holder:

Also called the "fuse tube" or "door", it's an insulating tube holding the replaceable fuse element. When the current exceeds the fuse's rating, the element melts, opening the circuit. Then the fuse holder drops from the upper contact and hangs from a hinge at its lower end. This shows that the fuse has worked and the circuit is open. It can also be manually opened by pulling it out with a hot stick.

● The Fuse Element:

Known as the "fuse link", it's a replaceable part. When the current through it goes over its rated value, it melts and breaks the circuit, protecting the transformer from excessive current.

Sometimes, the fuse holder can be replaced with a solid blade, so it can work just as a switch.