Currentlimiting mv fuse links are similar in construction. The typical fuse consists of an element which is surrounded by filler and enclosed by the fuse body. Metcalf, in the late 1930s consists of applying overlay spots of special low melting alloy onto the fuse element. The distinguishing feature of sloblo fuses is that these fuses have additional thermal inertia designed to tolerate normal initial or startup overload pulses. Switch disconnectorswitch disconnector fuse, hrc fuse. There is also a presence of a switch through which the fuse can be removed without getting an. The circuit is completed when the tip of the cartridge makes contact with the conductor. A fuse is a protection device used to protect a device or a circuit from severe damage caused due to overcurrent or short circuit faults. Currentlimiting mv fuse links are similar in construction to low voltage lv cartridge types. Iec size in a ph w part number product hierarchy 0002000002 order. It is one of the easiest forms of fuse which is used for the purpose of distribution. Hrc fuse high rupturing capacity fuse and its types.
Medium voltage hrc fuses cable cleats, cable joints, cable. Fuse characteristics, terms and consideration factors. Hrc fuse consist of a fuse wire in it, which carries the short circuit current to a limited period of time. This kind is easily replaceable in the circuit without any load. Fuse characteristics, terms and consideration factors continued 3. Figure a shows the essential parts of a typical hrc.
Again, these types of fuses are classified into two types, they are dtype and linktype fuses. In that type of fuse, the fuse wire or element can carry short circuit heavy current for a known time period. S01574a ofaa s01574a fusegear bs and din type hrcfuse. Its configuration, mass and the materials employed are selected to. In this video i will show you working of hrc fuse and hrc fuse construction instagram. In this mode, the fuse does operate during the first major half cycle, and does limit the magnitude of the fault current. Selected hrc fuse links should have current rating not less than the normal full load current of circuit. M effect bussmann high voltage fuse links include meffect as a design feature to enhance performance. Jul 16, 2015 in some point of view hrc fuse is better than circuit breaker.
The fuse wire inside the hrc fuse conducts the short circuit current for a period of time safely. Hrc fuse link is a very common, simple and effective electrical protection device against over load and short circuit current. The complete range conforms to is 703 part 2 iec 602692 standards. Introduction a fuse is one type of over current device that is designed to be a. Hrc fuse construction, working and characteristics electrical. Industrial fuses made to bs88 standards are very popular in countries like england, australia and south africa. All other copies of this document are by definition.
Hrc fuse link range is available in 14x51 cylindrical, din and bs type. Lv hrc fuse bases and accessories 545 fuse bases for screw or snapon mounting onto standard mounting rails, available as 1pole or 3pole version. Internal construction may vary depending on ampere rating. It is mounted by screw connections in a holder which partly encloses it. The fuse base has the fuse cap, which is fitted with the fuse element with cartridge through adapter ring.
High voltage fuse technology for more information visit our website. The cartridge type of fuses has entirely closed containers and the metal contact as well. Hrc fuse or high rupturing capacity fuse in that type of fuse, the fuse wire or element can carry short circuit heavy current for a known time period. Switch disconnectorswitch di sconnector fuse, hrc fuse fuse base power switching. Performance testing of hrc fuse links fuse electrical. Rated watt loss w watt loss limits as per is 703 suitable for sdf units type fn fnx or equivalent 100 amp, fuse 7. Jan 02, 2019 hrc fuse or high rupturing capacity fuse hrc fuse or high rupturing capacity fuse in that type of fuse, the fuse wire or element can carry short circuit heavy current for a known time period.
Hrc fuse or high rupturing capacity fuse marine notes. This type of fuse is very reliable in performance and can be used when discrimination is required. High rupturing capacity hrc hrc is used by canadian and british standards as an equivalent to the u. Lv hrc signal detectors 543 signal detectors for when a fuse is tripped on all lv hrc fuse links with combination or front indicators with noninsulated grip lugs. Selection guide fuse characteristics, terms and consideration. All cooper bussmann british style fuses are tested to iec 269. During this time if the fault is removed the fuse doesnt blow off. Concept and working of different types of fuses protection. This type of alloy has some specific characteristics due to which this is preferred as fuse wire. It is a interrupting medium to a high capacity current in a circuit to. The abbreviation of hrc fuse is high rupturing capacity cartridge fuse.
Configuration manual for catalog lv 10 20162017 chapter 5. Nh fuse din type blade contact hrc fuse contains a fuse wire in it, which. Fusegear bs and din type hrcfuse links offn, ofaf h. During this time if the fault is removed, then it does not. Hrc fuses type 3na3introduction lv hrc fuses during installations, when the hrc fuses are mounted on the fuse bases or switch disconnector fuse units in panels above certain height, it is very difficult to identify the status of the fuse.
In this type of fuse, the fuse element is wound in the shape of the ring for removing the corona effect. In north america, fuses are required to clear only their rated voltage. As clear from the figure above, the fuse element have a portion of tin alloy, known as a eutectic material. A fuse consists of a replaceable part the fuselink and a fuse holder. Class gg fuse links provides complete protection of cables. In this type, the conducting plates are bolted to the base of the fuse. Electrical fuse hrc fuse high rupturing capacity electrical4u. During this period, if fault is removed, then it does not blow off otherwise it will melt and remove the circuit from electrical. In two or three sentences, state two main advantages of hrc fuses. It consists of fuse wire which is designed according to the customers requirement and the rest of the design depends upon it. A high rupturing capacity hrc fuse is a fuse that has a high breaking capacity higher ka rating. There is a small overlap zone between the overload and shortcircuit modes of operation, where the fuse may or may not act in the currentlimiting mode. The applications of this fuse mainly include low voltage lv, high voltage hv, and small fuses. May 29, 2018 a fuse is a protection device used to protect a device or a circuit from severe damage caused due to overcurrent or short circuit faults.
Mains construction instruction mci 0006underground distribution construction standard manual equipment technical specification ets 0083 12kv24kv expulsion dropout fuse. The industrial versions are characterised by either clipin tags, offset tags or centre tags. For this purpose, special insulated fuse pullers are used. This standard requires a test voltage which is 5% higher than the rated voltage.
Design and manufacturing of hrc fuse links engineers edge. The characteristic of an hrc fuse is compared with that of an induction relay. To install them in their holders, the usual practice is to screw the fuse to the inside of the fuse. Fuse characteristics can be classified into three general categories. During the time when heavy current flows, if the fault is removed then it does not melta otherwise it melts. Construction and features range overview switch disconnector fuse 2. Because of its high current rupturing capacity, a special method for extinguishing arc is required in the. Plus the comprehensive accessory range required for lv hrc fuse systems. Both the ends of ceramic body consist of metal end caps.
In hrc fuse or high rupturing capacity fuse, the fuse wire or element can carry short circuit heavy. Nh fuse din type blade contact hrc fuse contains a fuse wire in it, which carries the short circuit current safely for a given time period. The disadvantage of all types of fuses, of course, is the fact that when they have. Hrc high rupturing capacity fuse or link type cartridge fuse. There is also a presence of a switch through which the fuse can be removed without getting an electrical shock. Hrc products are supplied to customer specified lengths from 250mm to 12 000mm. Hrc fuses present a number of features such as low watt loss enabling longer life and very high breaking capacity. The vapour of fuse element and the powder together form the high resistive substance which extinguishes the arc. The construction of the fuse element is similar to the low voltage fuses. During the short circuit period, if fault is removed immediately, then the fuse. The current carrying element is completely surrounded by the filling powder. In the bolted type hrc link fuse, the conducting plates are bolted to the base of the fuse. Fuses offer long life without deterioration in their characteristics or performance, and cartridge fuses have the particular advantage that they contain the arc products completely. Hrc fuses mainly consist of a heat resisting ceramic body.
In power plants, hrc fuses are used extensively to protect buses, feeders and loads. Hrc fuselink range is available in 14x51 cylindrical, din and bs type. Electrical faults, hrc fuses, shortcircuit currents, over currents. The enclosure of hrc fuse is either of glass or some other chemical compound.
Fuse characteristics, terms and consideration factors 24 fuse selection checklist 57. V14t33 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 current limiting fuses 3. They are quite reliable and can be selected for proper discrimination. An hrc fuse is a type of cartridge fuse, in which the fuse element is enclosed within a transparent capsule, usually made up of. High rupturing capacity hrc fuses are totally enclosed fuses. The element is welded or soldered to the fuse contacts blades or ferrules. Working of hrc fuse and hrc fuse construction in hindi. Mv fuse links can interrupt any current below the rated breaking capacity that melts the fuse elements satisfactorily. Hrc fuse links for use in air on motor starting and general appucations voltage range 3. Types and characteristic of hrc fuse the electrical portal. Hrc fuse or high rupturing capacity fuse carry short ckt heavy current for a known time period, unlike the normal fuses.
Switch disconnectorswitch disconnector fuse, hrc fusefuse base. A timedelay fuse also known as an antisurge or slowblow fuse is designed to allow a current which is above the rated value of the fuse to flow for a short period of time without the fuse blowing. By using advanced fuse technology, current ratings up to 400a have compact dimensions, but retain standard dimensional and performance requirements. Hrc fuse construction and hrc fuse working deepakkumar. These types of fuse are used on equipment such as motors, which can draw larger than normal currents for up to several seconds while coming up to. Combine headed bars with mechanical splices or metric sleeves or bolts. It does not deteriorate and has a high speed of operation fig. A silver current carrying element is welded to these metal end caps. The diagram below illustrates the three performance criteria in terms of their minimum breaking current i3. High rupturing capacity hrc fuses are totally enclosed fuses with definitely known, high breaking capacities which have been developed after intensive research by manufacturers and supply engineers. Hrc fuse construction working advantages and disadvantages. Class l 600vac, 300 to 6000a timedelay fuses form no.
During this time if the fault gets removed, then it does not blow off. Lv hrc fuse bases and accessories 545 fuse bases for screw or snapon mounting onto standard mounting rails. We have already disused in very details about hrc fuse high rupturing capacity construction, operation and their applications. In this type of fuse, the flow of current by fuse element is given under normal condition. All other copies of this bif document are by definition uncontrolled. E171267izlt2 only downstream from the branch protection csa c22.
Lv hrc signal detectors 68 signal detectors for when a fuse is tripped on all lv hrc fuse links with combination or front indicators with noninsulated grip lugs. Lv hrc fuse bases 1pole busbar mounting ac 690v sizes 002 160a400a 88 product definition lv hrc fuse bases for busbar mounting are stan dardized in accordance with din 43620 part 3. Hrc fuse links red spot standard bolted tag up to 660vac up to 1250a red spot 400 series bolted tag up to 440vac up to 400a safeclip blade tag up to 440vac up to 125a nh din standard knife blade up to 500vac up to 630a hrc fuse. Both the ends of ceramic body consist of metal end. Accessories tripindicator fuses are available for use in parallel with the main fuse. The fuse carrier can be pulled out and the blown out fuse element which wire melts can be fillup by a new one and carrier is replaced in the fuse base. These include voltage, current and the type of application. High rupturing capacity cartridge fuse, commonly called hrc cartridge fuses, have been designed. Illustrate, with a simple sketch, the construction of an hrc fuse. Hrc fuse operation,types and characteristics electrical.
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