STA / EMPA / SSK — high-voltage fuses 6–40.5 kV
STA, EMPA and SSK are high-voltage current-limiting fuses of high breaking capacity for indoor switchgear and outdoor switchgear. The fuse links protect transformers, cables, capacitors and switching devices. Rated voltages are from 6/12 to 20/36 kV, currents up to 160 A, rated breaking current I1 up to 63 kA.
- Rated voltage
- STA — 6/12, 10/24, 20/36 kV; EMPA — 12 and 24 kV; SSK — 6/12 and 10/24 kV; in the overview — 7.2–40.5 kV
- Rated current
- STA 2–160 A (20/36 kV — up to 100 A); EMPA 2.5–125 A; SSK 63–125 A
- Breaking capacity I1
- STA 63 kA (40 kA at 20/36 kV); EMPA 50 kA; SSK 63 kA
- Length e
- 292 / 442 / 537 mm
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
High-voltage high breaking capacity (H.v.h.b.c.) fuses are intended for indoor air-insulated and gas-insulated switchgear and for outdoor switchgear, including in difficult climatic conditions. The fuse links protect distribution and power transformers, cables, capacitors and switching devices. They are used in load-break switch and fuse combinations of secondary substations. In the overview catalogue, the program covers 7.2, 12, 24, 36 and 40.5 kV at currents up to 160 A and includes versions for indoor and outdoor installation and for SF6 switchgear.
The STA series (part numbers 797…) has an 80 N striker with built-in thermal protection. Rated voltages are 6/12, 10/24 and 20/36 kV, currents 2–160 A, for 20/36 kV 2–100 A, including the versions 80RC63 and 100RC71. The rated breaking current I1 is 63 kA (40 kA at 20/36 kV), the minimum breaking current I3 is 16–600 A. EMPA (part numbers 798…) also has an 80 N striker with thermal protection, is rated for 12 and 24 kV, currents 2.5–100 A for 12 kV and 2.5–125 A for 24 kV, I1 50 kA, I3 8–595 A. SSK (797 19…/797 29…) is intended for combinations with load-break switches and for transformers above 630 kVA, at 6/12 and 10/24 kV, currents 63, 80, 100 and 125 A, I1 63 kA, I3 210–450 A. Fuse links with a 120 N striker without thermal protection are also made.
Dimensions to DIN 43625: length e is 292 mm (6/12 kV), 442 mm (10/24 kV) and 537 mm (20/36 kV). The weight of the fuse links is 1.6–5.7 kg, power losses 8–320 W depending on the rating.
The striker operates when the element melts or the thermal protection operates, and acts mechanically on the load-break switch mechanism or a remote signalling device. Thermal protection, standard for fuse links with an 80 N striker, releases the striker and trips the load-break switch before the porcelain tube heats to a dangerous temperature. This is needed in case of incorrect rating selection or faults on the LV side of the transformer. Test cartridges of 70 and 100 N are offered for checking.
The program complies with IEC 60282-1, IEC 60644, IEC 60549, DIN 43625 and EN 62271-105. Fuse links for transformers are selected according to VDE 0670 part 402.
Technical specifications
| Rated voltage | STA — 6/12, 10/24, 20/36 kV; EMPA — 12 and 24 kV; SSK — 6/12 and 10/24 kV; in the overview — 7.2–40.5 kV |
|---|---|
| Rated current | STA 2–160 A (20/36 kV — up to 100 A); EMPA 2.5–125 A; SSK 63–125 A |
| Breaking capacity I1 | STA 63 kA (40 kA at 20/36 kV); EMPA 50 kA; SSK 63 kA |
| Length e | 292 / 442 / 537 mm |
| Striker | 80 N with thermal protection or 120 N |
| Weight | 1.6–5.7 kg |
| Standards | IEC 60282-1, IEC 60644, IEC 60549, DIN 43625, EN 62271-105, VDE 0670-402 |
Request a price and lead time
STA / EMPA / SSK — high-voltage fuses 6–40.5 kV. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Questions and answers
What voltages and currents are STA fuses made for?
The STA series is rated for 6/12, 10/24 and 20/36 kV, currents 2–160 A, up to 100 A for 20/36 kV. The rated breaking current I1 is 63 kA, and 40 kA at 20/36 kV.
How do STA, EMPA and SSK differ?
STA and EMPA have an 80 N striker with thermal protection; EMPA is rated for 12 and 24 kV, up to 125 A, I1 50 kA. SSK is intended for combinations with load-break switches and for transformers above 630 kVA, currents 63–125 A, I1 63 kA.
To which standards are the fuse links made and what are their lengths?
The fuse links comply with IEC 60282-1, IEC 60644, IEC 60549, DIN 43625 and EN 62271-105. Length e to DIN 43625 is 292 mm for 6/12 kV, 442 mm for 10/24 kV and 537 mm for 20/36 kV.
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