Part 2: Supplementary requirements for fuses for use by authorized persons (fuses mainly for industrial application) – Examples of standardized systems of fuses A to K
This standard gives the supplementary demands for fuses for use by authorized persons ,and are used in installations where the fuse links are approachable to and may be exchanged by authorized persons only. This standard is split into fuse systems each dealing with a particular example of standardized fuses for use by authorized person.
Fuse System A : Fuses with fuse links with blade contacts NH fuse system.
Fuse system B : Fuses with striker fuse links with blade contacts NH fuse system
Fuse system C : Fuse rails NH fuse system
Fuse System D : Fuse bases for busbar mounting NH fuse system
Fuse System E : Fuses with fuse links for bolted connections BS bolted fuse system
Fuse System F : Fuses with fuse links having cylindrical contact caps NF cylindrical fuse system
Fuse System G : Fuses with fuse links with offset blade contacts BS clip in fuse system
Fuse System H : Fuses with fuse links having gD and gN characteristic class J and class time delay and non time delay fuse types
Fuse System I : gU fuse links with wedge tightening contacts br Fuse system J Fuses with fuse links having gD class CC and gN class CC characteristics class CC time delay and non time delay fuse types
Fuse system J : Fuses with fuse links having gD class CC and gN class CC characteristics class CC time delay and non time delay fuse types
Fuse System K : K gK fuse links with blade for bolted connections High fuse link ratings from 1 250 A up to 4 800 A master fuse links
BS 88 Offset blade
UL 248 Class J & class L
Major tests to be performed in IEC 60269-2
Temperature rise & power dissipation test
Non-fusing & Fusing test
Verification of rated current test
Verification of Time Current Characteristics and Gates
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IEC 60269 is a array of standards for low voltage power fuses used for industrial and commercial use, residential use, for semiconductor devices. It is diversify as follows:
Low-voltage fuses – Part 1: General requirements
Low-voltage fuses – Part 2: Supplementary requirements for fuses for use by authorized persons (fuses mainly for industrial application)
Low-voltage fuses – Part 3: Supplementary requirements for fuses for use by unskilled persons (fuses mainly for household and similar applications)
Low-voltage fuses – Part 4: Supplementary requirements for fuse-links for the protection of semiconductor devices
Low-voltage fuses – Part 5: Guidance for the application of low-voltage fuses
Low-voltage fuses – Part 6: Supplementary requirements for fuse-links for the protection of solar photovoltaic energy systems
IEC 60269 is a relevant to fuses including enclosed current-limiting fuse-links with rated breaking capacities of not less than 6 kA, deliberated for protecting power-frequency a.c. circuits of nominal voltages not exceeding 1000 V or d.c. circuits of nominal voltages not exceeding 1500 V.
Fuse-links intended to be included in fuse-switch combinations according to IEC 60947-3 should also comply with the following requirements. The object of this standard is to establish the characteristics of fuses or parts of fuses (fuse base, fuse-carrier, fuse-link) in such a way that they can be replaced by other fuses or parts of fuses having the same features given that they are replaceable as far as their dimensions are agitated.
Test to be performed as per this standard are as follows:
Temperature rise test
Protection against Electric shock
Over current discrimination of fuse link
Cut off current characteristics
Resistance to heat
Resistance to corrosion
Resistance to abnormal heat and fire
Application category & time current characteristics :
The application category is of 2 digit code.
The first letter is “a” for short circuit protection fuse only, and
The first letter is “g” for fuse is intended to operate even with currents as low as those that cause it to blow in one hour.
The second letter depict the kind of equipment to be protected.
M –motor, G =general protection for wire and cables., Tr – treansformer.
Types of fuses
D(diazed) type fuse: They have ceramic body in shape of a bottle with metal cap ends fitted in screw-in fuse holder. They are available in five sizes D I(Swiss), D I (NDz), D II, D III, D IV, D **** D1 and DV are not tested as per IEC 60269.
NH Fuses: They have blade style terminals with oblong body. They are generally used in electrical substations , junction box and distribution board.