The current-limiting backup protection fuse serves as a critical component of overcurrent protection in American-style pad-mounted transformers. It is connected in series with fuses housed within the insertable fuse cartridge—such as current-limiting, dual-element, or dual-characteristic fuses—to implement a "dual-fuse protection" scheme. This device is an oil-immersed, current-limiting fuse specifically designed for short-circuit protection of internal transformer windings under fault conditions. Under normal operation, the backup protection fuse remains inactive, and its maximum interrupting rating is 50 kA.

Electrical Performance

Standard Packaging

1、Fuse

2、Installation and Operation Manual

3、Product Qualification Certificate

Order Number Explanation