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Wind power
Motor Protection
3.6kV high voltage current-limiting fuse
7.2kV high voltage current-limiting fuse
12kV high voltage current-limiting fuse
Transformer Protection
Germany DIN Dimension Standards
British BS Dimension Standards
12kV high voltage current-limiting fuse
40.5kV high voltage current-limiting fuse
Oil-immersed high voltage fuse
Oil-immersed high voltage current-limiting fuse
Voltage Transformer Protection
RN Series
7.2kV high voltage current-limiting fuse for motor protection  
This product is used in indoor AC system of 50Hz, rated voltage of 7.2kV, also can be used together with other protective electric apparatus (e.g. switch, vacuum contactor, etc.) to protect high voltage motor and other electrical equipment from overloading and short-circuit. 1.Type
1.Type
2.Basic parameters  
The basic parameters of fuses are shown in table 1
table 1
Type
Rated voltagek(kV)
Rated Current of Fuse (A)
Rated Current of Fuse-element(A)
Rated breaking current (A)
XRNM1-7.2(WFN*0)
7.2
160
25, 31.5, 40, 50, 63, 80, 100, 125, 160
50KA
XRNM1-7.2(WKN*0)
7.2
315
200, 224, 250, 315
Note:  
1 Above parameters are the ratings for single tube fuse. The fuses can be connected in parallel according to user's requirement to get higher current rated values.  
2 * is defined by the striker  
3( ) is for British Standard
3.Main technical data  
1Under the condition of specified conditions, the fuses can break any fault current from (1.6-3) Ie (rated current of fuse-element) to the rated breaking current of 50kA.  
2Time-current characteristics curve is shown in(Fig.1)The dotted lines stand for the current above the minimum breaking current.  
3Current-limiting characteristics curve is shown in(Fig.2)
4I2t characteristics are shown in(Fig.3)。
4.Shape and mounting size  
The shapes and dimensions of the fuses are shown in(Fig.4)、(Fig.5)。
5.Selection of Fuse  
The rated current of the fuse used for direct starting is given by following formula. Iy=NIn δWhere:
In----The full-load current of the motor  
δ-----synthetic coefficient as shown in Table 2  
N-----The ration of the starting current to the full-load current, generally N=6  
Iy----The current value during the starting time
Table 2
Starting times per hour r/h
2
4
8
16
δ
1.7
1.9
2.1
2.3
Draw the Iy value point corresponding to the starting time on the time-current characteri-stics curve, the characteristics curve corresponding to the point or the curve at the right of the point shows the fuse to be selected. The rated current of the fuse should be greater than 1.3 times of full-load current of the motor.
AddBeilin District, Xi'an City, Torch Road Park No. 18 building 4 layer
Tel400-9986-781
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