Power Fuses

Features

• The HRC Power Fuses belong to the Prime-MEC series. It interrupts high currents before the first loop of fault current has reached its natural peak value and therefore cuts down the required withstand capacity of the associated equipment on the electric system.
• Though small in size, it has a high breaking capacity and its enclosed type is suitable for use inside of the panel board.
• PRIME MEC fuses are equipped with striker pins for trip indicators as well as for operating the related load break switches.
• Link type fuse holder enables easy maintenance and high stability when replacing the fuses.
  With Fuse Checker, checking the conditions of a fuse in the panel board or by telecommunication is possible.(Optional)

Applied standards – IEC 282-1, DIN 43625, BS 2692, KSC 4612

Applications – Transformer protection

• To protect against short circuit current in the secondary part of a transformer and fault current in the transformer circuit.
• Condenser protection
• To protect against fault current in the condenser circuit.
• Motor protection
• To protect against fault current in the motor circuit
• Cable protection
• Fault current protection secures the cable

Characteristics

LS Prime-MEC power fuses are designed to protect equipments from fault current such as short-circuit, and generally used for the protection the circuits of transformers, capacitors and motors they protect.
For further safety and reliability the elements inside of fuses are made of silver, and high quality quartzs and and ceramic are used for magnetic rods and tubes, respectively.
LS medium voltage vacuum contactors using LS vacuum interrupters manufactured with World class technology are type tested in LS PT & T that is accredited high power test lab by World class KOLAS.
To ensure the performance they, installed in a vacuum contactor, are tested according to IEC 60282-1 in LS PT & T that is accredited high power test lab by worldclass KOLAS.

Considerations in application

• Power fuses are suitable for the protection from a short-circuit, Overload current will not protected.
• Reset or re-use after blowing is not possible. Fuse reset or re-use is not possible after fused are blown out.
• When the fuses are selected, the inrush currents arising from the starting transformers, motors, capacitors should be considered.
• When the fuses are selected, their usage and circuit requirements should be considered.
• For the purpose of protection from the fault current below the lowest interrupting current of the fuse it is desirable to replace it with a fuse having lower interrupting rate or add other overcurrent relay in series.
• Withstand voltage of the circuit should be higher than that of a fuse that protects it.
• If possible, select the fuse whose rated current is much higher than the load current. The rated current not sufficiently exceeding the normal current of the load may cause reduction in the service life.
• Replace all three fuses in case of blowing in a fuse.

Ratings

Voltage(kV)	Fuse link type	Rated current(A)	Transformer load(kVA)		Transformer load(kVA)		Fuse holder type
			Single phase		Three phase
			3.6kV	7.2kV	3.6kV	7.2kV
3.6/7.2kV	LFL-3/6G-5B	5	4~8	8~16	6.7~14	13~28	LFH-6G-D1HB
	LFL-3/6G-10B	10	6~13	13~25	11~22	21~44
	LFL-3/6G-20B	20	15~31	30~62	25~53	51~107
	LFL-3/6G-30B	30	21~42	40~84	35~73	70~145
	LFL-3/6G-40B	40	40~82	80~165	69~143	137~286
	LFL-3/6G-50B	50	49~102	98~204	85~177	170~354
	LFL-3/6G-60B	63	66~137	132~275	114~238	229~476
	LFL-3/6G-75B	75	68~165	134~330	117~285	233~751
	LFL-3/6G-100B	100	128~220	256~440	222~381	443~762
	LFL-3/6G-125B	125	151~275	302~550	261~476	522~952	LFH-6G-D2HB
3.6kV	LFL-3G-160B	160	211~352		365~610
	LFL-3G-200B	200	265~440		459~762
7.2kV	LFL-6G-160B	160	426~704		735~1220		LFH-6G-D2HB
	LFL-6G-200B	200	437~880		755~1520
24kV	LFL-20G-5B	5	20~43		36~75		LFH-20G-D2HB
	LFL-20G-10B	10	43~90		75~157
	LFL-20G-20B	20	99~206		172~358
	LFL-20G-30B	30	149~310		258~538
	LFL-20G-40B	40	267~557		464~965
	LFL-20G-50B	50	345~719		598~1246
	LFL-20G-60B	63	430~897		745~1554
	LFL-20G-75C	75	580~1145		1000~1983
	LFL-20G-100C	100	923~1527		1600~2645
	LFL-20G-125B	125	1364~1908		2362~3304
	LFL-20G-160B	160	2125~2443		3680~4232
	LFL-20G-200B	200	2650~3050		4593~5287