Littelfuse 700-xxx Series User Manual download pdf

© JUNE 2011 Littelfuse POWR-GARD Productswww.littelfuse.com

POWR-GARD

®

Fuses—Medium Voltage

1

Description

Littelfuse

®

offers a 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 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 800-227-0029,

Option 6.

Applications

• Power Transformer Protection

• Potential Transformer Protection

• Motor Controller Back-up Protection

• Fused Switches

• Feeder Circuits

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

carrying voltages greater than 38,000 VAC.

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.

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.

MEDIUM VOLTAGE FUSES

2,400-38,000 VAC • Current-Limiting

Bolt-in Mount Fuses

1 2 3 4 5 6 7 8 9 10

Summary of Contents

Page 1 - MEDIUM VOLTAGE FUSES

© JUNE 2011 Littelfuse POWR-GARD Productswww.littelfuse.comPOWR-GARD® Fuses—Medium Voltage1DescriptionLittelfuse® offers a selection of E- and R-rate

Page 2 - R-RATED MEDIUM VOLTAGE FUSES

© JUNE 2011 Littelfuse POWR-GARD Productswww.littelfuse.comPOWR-GARD® Fuses—Medium Voltage10LIVE PARTSTRIPLE BARRELBottom Lever InClosed Position.56

Page 3 - Fuses—Medium Voltage

© JUNE 2011 Littelfuse POWR-GARD Productswww.littelfuse.comPOWR-GARD® Fuses—Medium Voltage2R-RATED MEDIUM VOLTAGE FUSESCurrent-LimitingDescriptionR-r

Page 4 - D DD DDD

© JUNE 2011 Littelfuse POWR-GARD Productswww.littelfuse.comPOWR-GARD® Fuses—Medium Voltage3R-RATED MEDIUM VOLTAGE FUSES Current-LimitingRRATEDSySTEM

Page 5 - Current-Limiting

© JUNE 2011 Littelfuse POWR-GARD Productswww.littelfuse.comPOWR-GARD® Fuses—Medium Voltage4E-RATED MEDIUM VOLTAGE FUSES Current-LimitingDescriptionE

Page 6

© JUNE 2011 Littelfuse POWR-GARD Productswww.littelfuse.comPOWR-GARD® Fuses—Medium Voltage5E-RATED MEDIUM VOLTAGE FUSES Current-LimitingERATEDSySTEM

Page 7

© JUNE 2011 Littelfuse POWR-GARD Productswww.littelfuse.comPOWR-GARD® Fuses—Medium Voltage6E-RATED MEDIUM VOLTAGE FUSES Current-LimitingERATEDSySTEM

Page 8 - Clip Lock Design

© JUNE 2011 Littelfuse POWR-GARD Productswww.littelfuse.comPOWR-GARD® Fuses—Medium Voltage7E-RATED MEDIUM VOLTAGE FUSES Current-LimitingERATEDSySTEM

Page 9 - Fuses — Medium Voltage

© JUNE 2011 Littelfuse POWR-GARD Productswww.littelfuse.comPOWR-GARD® Fuses—Medium Voltage8E-RATED MEDIUM VOLTAGE FUSES Current-LimitingERATEDSySTEM

Page 10 - LIVE PARTS

© JUNE 2011 Littelfuse POWR-GARD Productswww.littelfuse.comPOWR-GARD® Fuses—Medium Voltage9Fuses — Medium VoltageE-RATED POTENTIAL TRANSFORMER FUSES

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