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Littelfuse Medium Voltage Product Brochure

Littelfuse Medium Voltage Product Brochure
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Littelfuse Medium Voltage Product Brochure - 1

POWR-GARD® Fuse Datasheet MEDIUM VOLTAGE FUSES 2,400-38,000 VAC • Current-Limiting Current-limiting E- and R-rated fuses are equipped with a mechanical indicator or striker pin that protrudes through the fuse cap upon operation of the fuse. This provides visual identification of a blown fuse and can be used as a trigger for external devices. Note: Extension distance 1/2” minimum; extension force 2 lb. minimum. General Information The terms “Medium Voltage” and “High Voltage” have been used interchangeably by many people to describe fuses operating above 600 volts. Technically speaking, medium voltage fuses are those intended for the voltage range from 2,400 to 38,000 Vac. High voltage fuses are for circuits c arrying voltages greater than 38,000 Vac. Description Littelfuse® offers a selection of E- and R-rated medium voltage fuses for the protection of trans ormers, potential f transformers, feeders, and motor circuits. Single, double, and triple barrel designs are available to cover a wide range of current, voltage, and interrupting atings. Conventional r ferrule type, clip lock, and bolt-in mounting configurations are 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 - Call 800-227-0029 E-rated fuses are considered to be general purpose fuses and can be used to protect against low and high values of fault current. R-rated fuses are designed for back-up protection. They must be used in series with other devices such as motor overload relays in order to achieve both overload and short-circuit protection. Medium voltage fuses are not intended to provide overload protection in the same sense as fuses rated 600 volts or less. Medium voltage fuse current ratings do not have the same meanings as the ampere ratings of low voltage fuses. All medium voltage fuses are limited in their ability to interrupt low value overcurrents, especially those between 100% and 200% of the fuse’s continuous current rating. They are designed to carry their rated current without exceeding the temperature rise permitted by NEMA and ANSI standards. • Power Transformer Protection • Potential Transformer Protection • Motor Controller Back-up Protection • Fused Switches • Feeder Circuits Bolt-in Mount Fuses © 2014 Littelfuse POWR-GARD® Products

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Littelfuse Medium Voltage Product Brochure - 2

R-rated fuses provide required short-circuit protection for medium voltage motors, motor controllers and associated circuitry. These components have limited ability to absorb the energy of large short-circuit currents. Medium voltage motor controllers contain overload relays which provide both overload protection and locked rotor protection to the motor. The controllers are also intended to interrupt low value short-circuits within the capability of the motor controller. This protects the medium voltage fuse from sustained overcurrents which are less than their minimum interrupting rating....

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Littelfuse Medium Voltage Product Brochure - 3

POWR-GARD® Fuse Datasheet ORDERING/ CATALOG NUMBER ORDERING/ CATALOG NUMBER ORDERING/ CATALOG NUMBER ORDERING/ CATALOG NUMBER R-RATED MEDIUM VOLTAGE FUSES * RMS Asymmetrical amperes = RMS Symmetrical amperes x 1.6 For hookeye attachment add “W” suffix to part number © 2014 Littelfuse POWR-GARD® Products

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Littelfuse Medium Voltage Product Brochure - 4

POWR-GARD® Fuse Datasheet E-RATED MEDIUM VOLTAGE FUSES E-rated fuses have time current characteristics designed to provide current-limiting protection for power transformers, potential transformers, power centers, feeder centers, and unit sub stations. When properly applied, they can protect against high and low fault currents. Voltage Ratings Current Range Options • Hermetically sealed for use in hazardous locations (add “S” suffix to part number) NEMA Standards for E-rated medium voltage fuses require that fuses rated 100E or less open within 300 seconds (5 minutes) when subjected to an...

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Littelfuse Medium Voltage Product Brochure - 5

POWR-GARD® Fuse Datasheet ORDERING/CATALOG NUMBER ORDERING/CATALOG NUMBER E-RATED MEDIUM VOLTAGE FUSES MAX INTERRUPTING RATING RMS (ASYM)* FIGURE NUMBER MAX INTERRUPTING RATING RMS (ASYM)* FIGURE NUMBER * RMS Asymmetrical amperes = RMS Symmetrical amperes x 1.6 © 2014 Littelfuse POWR-GARD® Products

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Littelfuse Medium Voltage Product Brochure - 6

POWR-GARD® Fuse Datasheet ORDERING/CATALOG NUMBER ORDERING/CATALOG NUMBER ORDERING/CATALOG NUMBER E-RATED MEDIUM VOLTAGE FUSES * RMS Asymmetrical amperes = RMS Symmetrical amperes x 1.6 © 2014 Littelfuse POWR-GARD® Products

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Littelfuse Medium Voltage Product Brochure - 7

POWR-GARD® Fuse Datasheet ORDERING/CATALOG NUMBER MAX INTERRUPTING RATING RMS (ASYM)* FIGURE NUMBER ORDERING/CATALOG NUMBER MAX INTERRUPTING RATING RMS (ASYM)* FIGURE NUMBER ORDERING/CATALOG NUMBER MAX INTERRUPTING RATING RMS (ASYM)* FIGURE NUMBER ORDERING/CATALOG NUMBER MAX INTERRUPTING RATING RMS (ASYM)* FIGURE NUMBER E-RATED MEDIUM VOLTAGE FUSES * RMS Asymmetrical amperes = RMS Symmetrical amperes x 1.6 © 2014 Littelfuse POWR-GARD® Products

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Littelfuse Medium Voltage Product Brochure - 8

POWR-GARD® Fuse Datasheet E-RATED MEDIUM VOLTAGE FUSES 4.31 The clip lock type designs ensures a positive contact between the fuse and the connection cam. The fuse’s clip lock tab slides in between the clip casting and the cam to prevent the fuse from slipping or blowing out of the holder. This positive contact improves heat dissipation and allows fuses to run cooler. 5.5 MAX. KV CLIP LOCK 8.25 MAX. KV CLIP LOCK Clip Lock Design * RMS Asymmetrical amperes = RMS Symmetrical amperes x 1.6 © 2014 Littelfuse POWR-GARD® Products

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Littelfuse Medium Voltage Product Brochure - 9

POWR-GARD® Fuse Datasheet E-RATED POTENTIAL TRANSFORMER FUSES Potential Transformer (PT) fuses are current-limiting fuses with high interrupting ratings designed for the protection of potential transformers. Voltage Ratings Current Range Application Note When applying fuses for the protection of transformers, the magnetizing current in-rush must be considered. The characteristics of the in-rush, which can be matched with a fuse time-current curve, should be available from the transformer manufacturer. ORDERING/CATALOG NUMBER MAX INTERRUPTING RATING RMS (ASYM)* * RMS Asymmetrical amperes =...

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