| Terms | Term Description |
|---|---|
| IEC 60269 – 1 | General requirements |
| IEC 60269 – 2 | Fuses intended for use by authorized persons |
| IEC 60269 – 3 | Fuses intended for use by unskilled persons |
| IEC 60269 – 4 | Fuses intended for the protection of semiconductor devices |
| IEC 60269 – 5 | Guidance for the application of low-voltage fuses |
| IEC 60269 – 6 | Fuses Intended for the protection of solar photovoltaic system / arrays |
| Breaking range | Utilization category | Protection of Load Type |
|---|---|---|
| g – Full range fuses | gG | Cable, Conductor, Equipments |
| g – Full range fuses | gL | Cable, Conductor, Equipments |
| g – Full range fuses | gM | Motors |
| g – Full range fuses | gR | Semiconductor – Fast |
| g – Full range fuses | gS | Semiconductor – Slow |
| g – Full range fuses | gD | Fuse with Time Delay |
| g – Full range fuses | gN | Fuse without Time Delay |
| a – Partial range fuse | aM | Motors |
| a – Partial range fuse | aR | Semiconductors |
HRC – High Rupturing Capacity Fuse. HRC fuse wire element can carry rated current continiously and it can also carry Short Circuit current as per its trip curve characteristics.
HRC fuse is made up of ceramic bottle with copper end cap at both ends to which fuse wire is welded. Bottle is fully filled with fillling powder which form high electrical resistance if fuse element is melted due to Short circuit, hence quenching the Arc inside the Fuse bottle.
Semiconductor fuse are special HRC fuse, which are ment for protection of Semiconductor load like, IGBT, Thyristor Switch, SCR, Rectifiers, UPS, VFDs, Soft Starter etc.
Semiconductor fuse element has fast acting characteristics for Protection of Semiconductor loads. For Proper Protection of Semiconductor loads, thermal energy I2t of fuse should be less than I2t of Load. Resistance of Fule element wire of Semiconductor has a characteristics which reduces resistance of element drastically with increase of element temperatuer which is due to over load or short circuit of the load, hence acting very fast.