High-Voltage Current Limiting Fuse for Motor Protection

  • Model NO.: XRNM3A- (3.6~12)/ -50
  • Type: Current Fuse
  • Shape: Circle
  • Fusing Device: Fuse Link
  • Transport Package: Carbon
  • Origin: Xi′an
  • Breaking Capacity: High
  • Usage: High Voltage
  • Fusing Speed: FF
  • Trademark: ZhenLi
  • Specification: silver, ceram
  • HS Code: 8535100000
This product applies to the indoor AC 50 ~ 60Hz system with the rated voltage of 3.6~12kV, and may be used along with other protective devices (such as the switch, vacuum contactor, etc.) as short-circuit and overload protection element for the high-voltage motor and other power equipment.
Model
International model   XRNM3A- (3.6~12)/  -50
Equivalent model


BS standard:

Basic parameters as per DIN standard

 
Product Model Equivalent Model Rated Voltage
(kV) 		Rated Current of Fuse Element
(A) 		 Standard Size Rated Breaking Current (kA)
φA(mm) L(mm)


XRNM3A-7.2 		WDLDJ

7.2 		25, 31.5, 40, 50, 63 φ51
292

50
WELDJ 63, 80, 100 φ66
WFLDJ 125, 160 φ76
WXLDJ 160, 200, 224, 250, 315 φ88
WFMDJ 25, 31.5, 40, 50, 63, 80, 100, 125, 160 φ76 442
WKMDJ 200, 224, 250, 315 φ76



XRNM3A-12 		WDLDJ


12 		20, 25, 31.5, 40, 50 φ51
292


50
WELDJ 50, 63, 80 φ66
WFLDJ 80, 100, 125 φ76
WXLDJ 160, 200 φ88
WFMDJ 25, 31.5, 40, 50, 63, 80, 100 φ76
442
WKMDJ 125, 160 φ76
WXMDJ 200, 224 φ88

Outline dimensions as per DIN standard


High-Voltage Current Limiting Fuse for Motor Protection
Fig. 1 Outline drawing of XRNM3A fuse link
 (1)Bus fuse
Model Equivalent model Rated Voltage  (kV) Rated Current of Fuse Link
 (A) 		Main Dimensions (mm) Rated Breaking Current  (kA)
A B C D
XRNM3A-3.6 WDF.0 3.6 50, 63, 80, 100, 125 377 254 305 Φ51 50
WFF.0 125, 160, 200 Φ76
WKF.0 250, 315, 355, 400
XRNM3A-7.2 WFF.0 7.2 25, 31.5, 40, 50, 63, 80, 100, 125, 160 486 403 454 Φ76 50
WKN.0 200, 224, 250, 315,
355
XRNM3A-12 WKX.0 12 25, 31.5, 40, 50, 63, 80, 100, 125, 160,
200, 224 		683 600 650 Φ76 50
Note: The above-mentioned are the rated parameters of single tube, and higher rated current value may be obtained through the parallel connection of fixed structure.
Outline drawing of bus fuse
High-Voltage Current Limiting Fuse for Motor Protection

Basic outline parameters of plug-in fuse
in mm
         Size code
Model    		A B C D E F G
WDF*0
390
312
80
140
246
254 		φ51
WEF*0

φ76
WKF*0
WFN*0 500 461 150 160 266 403
WKN*0
WFX*0 690 659 350 160 268 600
Outline drawing of plug-in fuse
High-Voltage Current Limiting Fuse for Motor Protection

Main technical data:
The fuse under specified operating conditions is able to reliably break any fault current from the minimum breaking current (1.6~3) ln to the rated breaking current 50kA.
Time - current characteristic curve is as shown in Fig. 4, Fig. 5 and Fig. 6.
Current limiting characteristic curve is as shown in Fig. 7.
High-Voltage Current Limiting Fuse for Motor Protection
High-Voltage Current Limiting Fuse for Motor Protection

Rational use of fuse
The rated current of the fuse for direct start shall be selected according to the following formula
Iy=NInδ
Where,
In- full load current of motor
δ- Coefficient of colligation as shown in the following table
N- Ratio of starting current to full load current, generally N = 6
Iy-Current value during start-up
Starting Frequency n/h 2 4 8 16
δ 1.7 1.9 2.1 2.3
The point corresponding to ly value at the starting shall be plotted on the time - current characteristic curve, and the curve corresponding to the point or the curve on the right side of point means the fuse's curve. The rated current of fuse shall be greater than 1.3 times the full load current of motor.
 

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