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H.V.HRC.current-limiting fuses type W for motor protection
H.V.HRC.current-limiting fuses type W for motor protection
     H.V.HRC Current-limiting Fuese Type W is designed for protection of motors or other power equipments working under a voltage of 3.6,7.2kV,50Hz,and with a rated current up to 224A fro moverloading or shortcircut.it can also be used withloading switch,vacuum contact.
     It conforms to IEC282-1,GB15166.2 and .BS.standard.
Basic Data

Rated voltage (kV)
Department
Models Foreign
Rated current of the fuse links(A)
Rated breaking current (kA)
Dimensions(mm)(mm) Fig.8.3-8.4
Weight(kg)
¦ÕD
L
3.6 XRNM1 WDF.O 50,63,80,100,125 50 51 254 1.4
3.6 XRNM1 WFF.O 125,160,200 50 76 254 2.8
3.6 XRNM1 WKF.O 250,315,355,400 50 76 254 2.8
7.2 XRNM1 WFN.O 25,31.5,40,50,63,80,100,125,160 40 76 403 4.15
7.2 XRNM1 WKN.O 200,224 40 76 403 4.15
10 XRNM1   25,31.5,40,50,63,80,100,125,160,200,224 40 76 600 5.26

Note:Under stipulated condition,min.breaking current of fuses could be as highas 2.5¡«3.0 tims than tated current.
7.2KV fuse link of 224A or above have a dual-tube body
3.6KV fuse link of 400A or above have a dual-tube body

Dimension drawing
Dimension of motor protection fuse type W for busbar installation(mm)

Model
Dimensions(mm)
A
B
C
G
E
F
WFF.O
390
312
340
140
246
209
WKF.O
390
312
340
140
246
209
WFN.O
500
461
150
160
266
358
WKN.O
500
461
150
160
266
358
XRNM1
690
659
350
160
266
555

Selection for W type motor current-limit fuse box
    When started with full voltage,Rated current ¡Ötwice of loaded motor current;When started under other curcumstances,rated current¡Ö1.25 times of loaded motor current.For directly started motor,fuses of proper rated currentshould be selected according to the following formula;
     Iy£½N¡¤In¡¤¦µ
     Iy¡ªstarting current
     N¡ªRatio of starting current and loaded current,usually N¡Ö6
     In¡ªloaded motor current
     ¦µ¡ªcomprehensive coefficient,see the table below;
¦µ Comprehensive coefficient        
Start times 2 4 8 16
¦µ 1.7 1.9 2.1 2.3
Refer to Time-current Characteristics Diagram for Selection of proper H.V. fuse link, Rated current of fuse link should be 1.3 times than loaded motor current.