E Rated Ferrule Style
Helix Type and Heritage CLE Rated medium voltages fuses are general purpose, indoor or outdoor fuses designed to provide both high and low level fault protection (Ferraz and Bussman brands are not indoor/outdoor). Helix fuses may be applied wherever it is necessary to limit short-circuit currents on high capacity systems. Because of their general purpose, current limiting characteristics, these types of fuses are well suited for a wide variety of distribution systems and consumer applications.
Features
- Available in both long and short clip center designs.
- For indoor or outdoor use (GE, Littlefuse, and Cutler-Hammer)
- Higher current ratings
- Cool operation
- Improved time-current characteristics
- Reduced I2t let through
- Variety of lengths and diameters
- Designed to be used in either disconnect or non-disconnect mountings.
- Quiet and safe operation
- Indicating and non-indicating can be made for hazardous conditions
- Optimized Energy Exchange: The double concentric helix configuration (inner and outer) optimizes energy exchange by making more efficient use of the sand filler.
- Improved Arc Control: The double helix design has more elements for more surface area permitting better arc control.
- Lower Temperature Rise: Heat radiation with the HLE design is excellent resulting in lower normal operating temperatures.
- Promotes Faster Melting: Under overload conditions, thermal transfer from the inner helix is reduced by a modified temperature gradient leading to faster melting.
- Blown Fuse Indication: Blown fuse striker pin will protrude from the top of the fuse providing a visual indication of operation, as well as a triggering means for external devices.
- Interchangeability: Helix Type fuses are mechanically interchangeable and in many cases have higher maximum current ratings than competing current limiting fuses.
- Limited Arc Voltage: Improved limited arc voltage on 40E and higher current rating fuses permits 15.5kV fuses to be used on 8.3kV circuits and 8.3kV fuses to be used on 5.5kV circuits (HLE).
- Ampgard Hook-eye option available on 2.75/5.5kV and 8.25kV
Applications
- Power transformer protection
- Fused switches
- Feeder circuit sectionalizing
Definitions
- E-rating: Over 100E must melt in 600 seconds (10 minutes) on 220 to 264% of E (ampere) rating. Example a 750E fuse must melt in 600 seconds with an applied current of 1650 to 1980 amperes.
- General Purpose Current-Limiting Fuse: A general purpose current-limiting power fuse is one that is capable of interrupting all currents from its rated interrupting rating down to the current that causes melting of the fusible element in one hour.
Brands:
- Bussmann
- Eaton Cutler Hammer Westinghouse
- Ferraz Shawmut
- General Electric
- Littelfuse
