Magnum fitness MF B300 Manuel de service télécharger pdf (Page 78)

V4-T3-78 Volume 4—Circuit Protection CA08100005E—April 2014 www.eaton.com

3.4

Power Breakers, Contactors and Fuses

Expulsion Fuses

Contents

Description Page

Catalog Number Selection . . . . . . . . . . . . . . . . . . V4-T3-79

Product Selection . . . . . . . . . . . . . . . . . . . . . . . . . V4-T3-80

Product Description

Eaton’s expulsion fuses use

boric acid as the interrupting

medium. Under a fault

condition, arc heat

decomposes the boric acid

into water vapor. The water

vapor blast deionizes the arc

path preventing arc re-ignition

after a natural current zero.

Type RBA indoor expulsion

fuses must be fitted with a

discharge filter or condenser,

that moderates the discharge

exhaust. The discharge filter

limits the exhaust to a small

and relatively inert amount of

gas and lowers the noise

level without affecting the

fuse interrupting rating.

Steam discharge, that can

effect the interrupting, is fully

restricted by the condenser.

Type RDB outdoor dropout

fuses include an ejector

spring that forces the arcing

rod through the top of the

fuse. The arcing rod strikes a

latch on the mounting that

forces the fuse to swing

outward through a 180° arc

into the dropout position.

Refill units can be field

installed into RBA and RDB

expulsion fuses. Once the

operated unit has been

removed, the separately

purchased unit can be easily

installed into the fuse holder.

Type DBU fuse units are

designed for new and

aftermarket utility applications.

End fittings are available, in

both indoor and outdoor

versions, as well as live parts

and mountings. Mufflers

confine the arc within the fuse

and substantially reduce the

noise and exhaust when the

fuse interrupts.

RBA E-Rated Refillable Boric Acid

RDB E-Rated Refillable Outdoor

Dropout Boric Acid

DBU Dropout Boric Acid—for Use

Indoors, Inside Switchgear or Outdoors

Accessories

The following accessories are

available for expulsion fuses:

Mountings

Mountings include a base,

porcelain or glass polyester

insulators, and live parts.

They help enable the fuse to

be safely attached to the

gear. Mountings can be

either disconnect,

nondisconnect or dropout.

Non-disconnect mountings

are available in bolt-on or

clamp-type arrangements.

Fuses may be vertical

or underhung.

Live Parts

Live parts attach the fuse to

the insulators and are

considered part of the

mounting. All parts above the

insulators are live parts.

End Fittings

End fittings are metal parts

that attach to each end of the

fuse at the ferrules. They are

used only on disconnect

fuses or when converting a

nondisconnect to a

disconnect fuse.

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 151 152

Commentaires sur ces manuels

Pas de commentaire

Magnum fitness MF B300 Manuel de service Page 78

Commentaires sur ces manuels

Produits connexes et manuels pour Vélo d'appartement Magnum fitness MF B300