Littelfuse now offers a complete selection of “E” and “R” rated medium voltage fuses for the protection of trans- formers, potential transformers, feeders, and motor circuits. Single, double, and triple barrel designs are available to cover a wide range of current, voltage, and interrupting ratings. Conventional ferrule type, clip lock, and bolt-in mounting configurations are now available for virtually any application. Hermetically sealed fuses for use in hazardous environments are also offered. Contact the factory or your local Littelfuse representative for additional fuse ratings or custom mounting configurations. 24 Hour Emergency Service is available. Call 1-800-227-0029.
Littelfuse offers a complete line of medium‑voltage fuses rated from 2,400 V up to 25,500 V (and up to 38,000 V in some sections). The catalog covers E‑rated general‑purpose fuses and R‑rated backup fuses, as well as potential‑transformer (PT) fuses, providing protection for transformers, motor controllers, feeders and other high‑voltage equipment.
The fuses are available in single, double and triple barrel designs with mounting configurations such as bolt‑in, clip‑lock, inverted‑bolt and hermetically sealed versions for hazardous locations. Detailed part numbers, current ratings, voltage ratings and interrupting‑rating tables are included for each style.
| Voltage Rating | 2,400 V – 38,000 V |
|---|---|
| Current Range (R‑rated) | 2R – 36R |
| Current Range (E‑rated) | 10E – 600E |
| Maximum Interrupting Rating | 80,000 A (asymmetrical) |
| Mounting Options | bolt‑in, clip‑lock, inverted‑bolt, hermetically sealed |
They are rated from 2,400 V up to 25,500 V (and up to 38,000 V in some sections).
An R‑rated fuse must open within 15‑35 seconds at 100 × the rating.