2

24kV Current Limiting Fuses

Features
◆ Protects high-voltage circuits and equipment from over current and short circuit current
◆ Economically effective and has high interruption abilities
◆ The lightest product available in the market
◆ Has 50kA of interruption capacity, which makes it the perfect product for circuit protection

Watertightness-high quality
Fuse manufactured by Joongwon uses patented manufacturing system and even homogeneous parts and therefore offers watertightness in any situations. The company also monitors 100% of its products very thoroughly to ensure that its excellent manufacturing processes are always implemented.
Through this, Joongwon fuse has a safety life of 30 years indoors and outdoors.

Consumption-low power loss
The size of fuse holders used in equipments such as SF6 gas insulated switchgear (GIS) has been minimized. Therefore, it needs an additional way of releasing the heat that is generated.
As shown in its electrical specification, Joongwon fuse has a very low electricity consumption, and therefore generates little heat.
This shows that the quality of Joongwon fuse in comparison to other products in the market is definitely better.

Minimum melting current-breaking capacity
Joongwon fuse has been made according to international standards, meaning that it can interrupt current in any situations including minimum fusing current and rated breaking current.

Also, it has a low minimum fusing current compared to other products in the market, while having a larger rated breaking current, which makes it a better option for circuit protection.
This is Joongwon fuse’s unique characteristic, which proves its superior quality.

Searchability-control
Quality monitoring system of Joongwon aims to minimize permissible variety in quality including part shelf-life, main circuit resistance (20℃) and weight. Such information is automatically stored in a computer system.

Applications

24kV 630A / Load Break Switch: High-voltage current limiting fuse is being used in combination with other protective equipment, as it is outstanding and economically effective in protecting high-voltage circuit or high-voltage equipment from over current and short circuit current. Our product is the lightest in the market and has a high interruption capacity of 50kA, which makes it the perfect product for circuit protection.

document download

Catalog and Manual > 24kV-High-Voltage-Current-Limiting-Fuses_opt

Information

Features

◆ Protects high-voltage circuits and equipment from over current and short circuit current
◆ Economically effective and has high interruption abilities
◆ The lightest product available in the market
◆ Has 50kA of interruption capacity, which makes it the perfect product for circuit protection

Specification

Electrical characteristics

Type	Rated voltage(kV)	Rated current(A)	Rated breaking current / I11) (kA)	Minimum step current / I32) (A)	Rated power loss(W)		Resistance at 20℃(mΩ)	I2t (kA2s)
Type	Rated voltage(kV)	Rated current(A)	Rated breaking current / I11) (kA)	Minimum step current / I32) (A)	50%	100%	Resistance at 20℃(mΩ)	Prearcing	arcing
IB-D0	24kV	2	31.5	16	4	16	3290	0.005	0.3
IB-D1		6.3	50	49	4.0	20	500	0.007	4.5
		10		31	9.7	42	315	2	22
		16		55	11	57	165	3	28
		20		81	13	60	110	4	31
		25		121.5	11	64	73	4.2	34
		31.5		162	15	77	55	5	39
		40		200	20	115	44	6	42
IB-D2		50		262.5	21	112	28	7	50
IB-D2		63		350	24	140	22	9	107
IB-D3		80		456	38	225	18.3	19	166
IB-D3		100		550	45	260	13.2	24	208
IB-D4		125	25	750	100	595	11.5	28	220
		160		950	69	310	9.0	32	235
		200		1040	79	576	8.0	34	240

1) I1 = Rated breaking capacity.
2) I3 = Minimum melting current.

* With regards to specifications other than what is listed above, please make an enquiry to us.
* 12/36kV fuse is imported and sold and will require prior arrangements.

Application guide

Transformers protection

Rated fuse current(A)	Transformers power(kVA)
Rated fuse current(A)	1Ø	3Ø
2	14	25
6.3	43	75
6.3	57	100
6.3, 10	72	125
6.3, 10	86	150
10, 16	115	200
16	144	250
16, 20	173	300
16. 20	202	350
20, 25	230	400
20, 25	260	450
25, 31.5	288	500
25, 31.5	346	600
31.5, 40	404	700
31.5, 40	433	750
31.5, 40	461	800
40, 50	519	900
40, 50, 63	577	1,000
50, 63	721	1,250
63, 80	866	1,500
80	1,010	1,750
100	1,154	2,000
100, 125	1,443	2,500
125, 160	1,732	3,000
160, 200	2,309	4,000
200	2,598	4,500

The fuse’s specification must be below the over current of the circuit or equipment that is to be protected. The heat released from its activity must be smaller than the short circuit.
If you are using the fuse as a back up of a protective equipment, you need to make sure that the protective equipment acts quicker than the fuse in current that is below the minimum interruption current of the fuse.
You also need to make sure that the fuse acts quicker than the protective equipment of the power, but later than that of the resistance aspect.

Selection condition
Transformer magnetizing current is hypothesized to last for 0.1s in the magnitude of 10 on the transformer full-load current.
Interruption within 0.2 s in the second short circuit current of the transformer.

Capacity protection

Rated voltage(kV)	Phase	Capacitor’s power	Rated fuse current
24	3Ø	less than 40	6.3
		40 ~ 90	10
		90 ~ 140	16
		140 ~ 200	20
		200 ~ 280	25
		280 ~ 400	31.5
		400 ~ 600	40
		600 ~ 800	50
		800 ~ 1100	63
		1100 ~ 1400	80
		1400 ~ 1900	100
		1900 ~ 2500	125
		2500 ~ 3100	160
		3100 ~ 4000	200

* Condenser’s magnetizing current is selected by hypothesizing a carrying current that is 71 times that of the rated current and lasts for 0.002s.
* Fuse’s rated current is selected to carry 1.5 times the rated current of the condenser.

Table Ref