High-Voltage Current Limiting Fuse for Transformer Protection

  • Model NO.: XRNT3A
  • Type: Current Fuse
  • Shape: Insert
  • Fusing Device: Link Break
  • Trademark: zhenli
  • Origin: Xi′an
  • Breaking Capacity: High
  • Usage: High Voltage
  • Fusing Speed: FF
  • Standard: UL
  • Transport Package: Carbon
  • HS Code: 8535100000
This product applies to the indoor AC 50 ~ 60Hz system with the rated voltage of 3.6~40.5kV, and may be used along with other switching devices (such as load switch, vacuum contactor, etc.) as short-circuit and overload protection element for the power transformer and other power equipment. The product is also essential for the high-voltage switchgear, ring main unit, high/low-voltage pre-installed substation.
 
Model
GB model:XRNT3A-/-50
Overseas equivalent model:
 High-Voltage Current Limiting Fuse for Transformer Protection

Outline dimensions
High-Voltage Current Limiting Fuse for Transformer Protection

Fig.1 XRNT3A plug-in fuse link
 
 
 
 
 
 
 
 
Basic parameters
Product Model Equivalent Model Rated Voltage
(kV) 		Rated Current of Fuse Element (A)  Standard Size Rated Breaking Current
(kA)
L(mm) φA(mm)
XRNT3A-7.2 SDODJ 7.2 3.15, 6.3, 10, 16, 20, 25, 31.5, 40 192 φ51 50
SEODJ 50, 63, 80 φ66
SFODJ 100, 125 φ76
SXODJ 160, 200 φ88
SDLDJ 6.3, 10, 16, 20, 25, 31.5, 40, 50 292 φ51
SELDJ 63, 80, 100 φ66
SFLDJ 125, 160 φ76
SXLDJ 200, 250, 315 φ88
SEMDJ 100, 125 442 φ66
SFMDJ 160, 200 φ76
SXMDJ 250, 315, 355 φ88
XRNT3A-12 SDODJ 12 1, 2, 3.15, 6.3, 10, 12 192 φ51 50
SELDJ 16, 20, 25, 31.5, 40 φ66
SFODJ 50, 63 φ76
SDLDJ 3.15, 6.3, 10, 16, 20, 25, 31.5, 40 292 φ51
SELDJ 50, 63, 80 φ66
SFLDJ 100, 125 φ76
SXLDJ 160, 200 φ88
SDMDJ 6.3, 10, 16, 20, 25, 31.5, 40, 50 442 φ51
SEMDJ 63, 80, 100 φ66
SFMDJ 125, 160 φ76
SXMDJ 200, 250 φ88
XRNT3A-24 SDLDJ 24 2, 3.15, 6.3, 10, 12 292 φ51 31.5
SELDJ 16, 20, 25, 31.5, 40 φ66
SFLDJ 50, 63 φ76
SDMDJ 6.3, 10, 16, 20, 25, 31.5, 40 442 φ51 50
SEMDJ 40, 50, 63 φ66
SFMDJ 63, 80 φ76
SXMDJ 100, 125 φ88
SFQDJ 63, 80, 100 537 φ76
SXQDJ 125, 160 φ88
XRNT3A-40.5 SDMDJ 40.5 2, 3.15, 6.3, 10, 12 442 φ51 31.5
SDQDJ 2, 3.15, 6.3, 10, 16, 20 537 φ51
SEQDJ 20, 25 φ66
SFQDJ 31.5, 40 φ76
SXQDJ 50, 56, 63 φ88
 
Main technical data
1. The fuse under specified operating conditions is able to reliably break any fault current from the minimum breaking current to the rated breaking current.
2. This product applies to the indoor AC 50 ~ 60Hz system.
3. Time - current characteristic curve, as shown in Fig. 2, Fig. 3 and Fig. 4, the part above the minimum breaking current is indicated with dotted line.
4. Current limiting characteristic curve is as shown in Fig. 5.
5. I2t characteristic curve is as shown in Fig. 6.
 High-Voltage Current Limiting Fuse for Transformer Protection

   Fig. 2 XRNT3A-12 time - current characteristic curve
 
High-Voltage Current Limiting Fuse for Transformer Protection       
High-Voltage Current Limiting Fuse for Transformer Protection

Selection of fuse
General selection principle for primary fuse of transformer
 
Rated Voltage  (kV) Rated Capacity of Transformer (kVA)    
100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000
Rated Current of High-voltage Fuse (A)
6/7.2 16 20 20 25 31.5 40 50 63 80 100 125 160 200 250
10/12 10 16 16 20 25 31.5 40 50 63 80 80 100 125 160
15/17.5 6.3 10 10 16 16 20 25 31.5 40 50 80 80 100 125
20/24 6.3 10 10 10 16 16 20 25 31.5 40 50 63 80 100
35/40.5 3.15 6.3 6.3 6.3 10 10 16 16 20 25 31.5 40 50 56
 
 
Outline drawing of non-standard fuse link
High-Voltage Current Limiting Fuse for Transformer Protection
Advantage of the ZhenLi Fuse
1.    Unique design
ZhenLi have a professional R &D term. Product performance or price is optimized every year. Now, the company has two national invention patents and eight practical patents. The stability and reliability are international standards.
2.    Material purchase
For materials, customers can test samples or products they receive. The materials of links contacts are 99.95% electrolyte cooper. The material of link body is high tension insulator. The materials of melting are No.1 pure silver. The arc extinguishing material is high silica quartz sand.  All raw material data are available.
3.    Partner
Now, ZhenLi company has many well-know domestic and foreign partners. Such as ABB, Schneider, TBEA. The annual output value is about 100 million in 2017. We are also constantly improving ourselves in out cooperation with large enterprise. It is a required course for enterprise to save cost through automatic production line and process flow.
4.    After sale
Strong aftermarket team: ZHEN-LI pursuits of all-round one-stop service as per the industry standard warranty period. ZHEN-LI devotes itself to providing the dedicated customer service. After-sales team is so perfected that the professional service personnel can meet the various requirements of customers technically or onsite. ZHEN-LI has developed for nearly 20 years and has never escaped the problem. For the overseas wind field or domestic city indoor box transformer, the special after-sales contact is provided to help the on-site technical staff to solve the problems and replace the maintenance products. ZHEN-LI puts the customer satisfaction in the first place and provides the customer with the high-quality and efficient services based on the professional competence and enthusiasm to continue to improve the customer satisfaction and guarantee the production of customer.
5.    Price guarantee
For this bid, our company has done all we can to provide the lowest price. Even so, we guarantee that the goods received by the customer are the same as ABB, Schneider. In the meantime, pre-service and after-service are guaranteed. All questions are available at any time during use.

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