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high voltage limit current fuse for protection electrical motor(england bs standard)
Categories:High Series   
□The product can be used in indoor Ac system of 50Hz and rated voltage 3.6kV and 7.2KV 12Kv. When used together with other protection facilitles(such as switches and vauum contactors),it works to protect high-volttage motor and other electric facilities from overloading and circrit break.

◆Type instruction

◆Basic parameters
  Foreign TYPE Rated voltage KV Rated break current KA Rated current of the fuse (A) Rated current of the fuse link (A) Major dimensions
A B C D

XRNM1-3.6
WDF.0 3.6 50 125 63,100,125 337
(390)
254
(312)
305
(340)
51
WFF.0 200 125,160,200 76
WKF.0 400 250,315,355,400
XRNM1-7.2 WFF.0 7.2 160 25,31.5,40,50,63,
80,100,125,160
486
(500)
403
(461)
454
(150)
76
WKN.0 12 315 200,224,250,315

Note:1.The aboveid rated parameters for single pipe,the fuses can be parallel connected by fixed structure to geta high rated current.
   2.Sizes in the bracket are for inserting fuses.


◆Installation Dimensios
Chat1 Busbar fuse lnstallation Dimensions
Chat2 Inserting fuse Installation Dimensions
◆Main technical characteristics

1.In required working conditions,the fuse can break any fault current between the minimum break current 1.6-3 and the
rated break current.
2.See Chart 3 for time-current property.The section above the minimum break current is by dotted line.
3.See Chart 4 for current limn property.
4.See Chart 5 for l2t property.




◆Basic parameters
Type UN(KV) IN(A) d×L(mm) A(mm) C(mm) KA 国外参考型号
XRNM1 3.6 50 Φ51×254标准尺寸 337 305 63 WDFHO
63
80
100
125
160 Φ76×254标准尺寸 WKFHO
200
224 50
250
315
355
400
7.2 25 Φ76×403标准尺寸 486 454 63 WFNHO
31.5
40
50
63
80
100
125
160
200 50 WDNHO
224
250 Φ76×403
Φ88×403
315
12 25 Φ76×403标准尺寸 486 454 63  
31.5
40
50
63
80
100
125
160 50
200
224









□These devices are suitable for a.c.50Hz,rated voltage 3.6kv.7.2kv,12kv power systems and they canbe used with other protection electric apparatus(such asload switch,vacuum contactor)as portectionof trans for mer power equipment against overloads or short-circuits.
Type
基本参数:表1、表2
表1
Type rated voltage (kV) 熔断件额定电流(A) 额定最大开断电流(kA)
WDLJ 7.2 25 31.5 40 50 63 50
12
WFLJ 7.2 50 63 80 100
12
WKLJ 7.2 125、160
12
WXLJ 7.2 160 200 224 250 315
12 160 200
表2
Type rated voltage (kV) 熔断件额定电流(A) 额定最大开断电流(kA)
WFMJ 7.2 25 31.5 40 50 63 80 100 125 160 50
12 25 31.5 40 50 63 80 100
WKMJ 7.2 200 224 250 315
12 125 160
WXMJ 7.2  
12 200 224



主要技术数据
  熔断器在规定的使用条件下,能可靠分断最小开断电流I3(125A以内不包括125A,I3大约为4 In;125A以上,I3大约为7In)至额定最大开断电流I1之间的任何故障电流,时间-电流特性曲线如下图。




熔断件外形及安装尺寸

φ76×292熔断器外形及安装尺寸
φ76×442熔断器外形及安装尺寸



熔断器的使用
用于直接起动的熔断器额定电流的使用按如下公式。
Iy=NInδ
其中:ln-电动机满载电流
  δ-综合系数如表5
  N-起动电流与满载电流之比,通常N=6
  Iy-在起动时间内的电流值
表5
每小时起动次数n 2 4 8 16
δ 117 1.9 2.1 2.3
  将起动时间对应的Iy值的点绘制在时间电流特性曲线上,点所对应的曲线或靠近这一点右边的曲线即是所使用的熔断器, 熔断器额定电流应大于1.3倍电动机的满载电流。

  高压熔断器信号指示装置,通过与高压熔断器连接,其上的微型开关,可以监控高压熔断器的工作状态。利用绝缘柔性 可弯曲传动装置,将熔断器撞击器的运动传至微型开关,微型开关有一对交流250V/5A一常开一常闭的转换接点。
  本装置撞击器端可以利用连接板1配套高压弹簧夹触头安装,此配件螺孔直接与高压熔断器弹簧夹触头螺孔相匹配,不必 另外钻孔;也可利用连接板2,高压熔断器无需任何改变,不管插入式还是母线式接线均可直接对接完成。微动开关端,统一根 据高压熔断器的供电电压,可安装在距熔断器500mm的最大范围内,另需在底板或其他安装位置配作两个M5安装螺孔即可。
根据用户需要,提供的其它接线形式



表1
Type rated voltage(kV) 熔断件额定电流(A) 额定最大开断电流(kA)
WFNJ 7.2 25 31.5 40 50 63 80 100 125 160 50
12 25 31.5 40 50 63 80 100
WKNJ 7.2 200 224 250 315
12 125 160
WXNJ 7.2  
12 200 224
表2
Type rated voltage (kV) 熔断件额定电流(A) 额定最大开断电流(kA)
WFZJ 7.2 25 31.5 40 50 63 80 100 125 160 50
12 25 31.5 40 50 63 80 100
WKZJ 7.2 200 224 250 315
12 125 160
WXZJ 7.2  
12 200