H14FD‑H14FF 14X51 Semiconductor Fuse | 1A‑63A Fast‑Acting aR Fuse
H14FD‑H14FF 14X51 semiconductor fast‑acting aR fuse,1‑63A,690VAC /600VDC,100kA AC &50kA DC interrupting rating for UPS,inverter,variable‑frequency drive protection,compliant IEC60269‑4,UL248‑13,custom specifications available.
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H14FD‑H14FF 14X51 Semiconductor Fuse is cylindrical fast‑acting aR‑category fuse‑link designed for semiconductor device short‑circuit and overload protection. This 14×51mm series covers current ratings from 1A to 63A, rated for 690V AC(IEC),700V AC(UL) and 600V DC, delivering high interrupting performance of 100kA for AC circuits and 50kA for DC circuits. It adopts variable‑cross‑section melt made of 99.99% pure silver, encapsulated inside high‑strength ceramic body filled with high‑purity quartz‑sand arc‑quenching medium. Widely used for small‑size inverters, UPS power systems and variable‑speed drive equipment. Custom parameters can be developed for special project requirements.
| Series Model | H14FD / H14FF 14X51 Semiconductor Fast‑Acting Fuse |
| Utilization Category | aR (Semiconductor protection fuse‑link) |
| Dimension Size | 14×51 mm cylindrical ferrule‑type |
| Rated Voltage | 690V AC(IEC),700V AC(UL); 600V DC |
| Rated Current Range | 1A‑63A |
| Interrupting Capacity | 100 kA (AC), 50 kA (DC) |
| Internal Construction | 99.99% pure‑silver variable‑section melt, high‑strength ceramic tube, quartz‑sand arc‑extinguishing medium |
| Compliance Standards | GB13539‑4, IEC60269‑4, UL248‑1 / UL248‑13 |
| Operating Ambient Temperature | ‑40 °C ~ +125 °C |
| Installation Altitude | ≤2000 m; special design available for altitude above 2000 m |
| Typical Applications | Small‑power inverter, UPS power supply, variable‑speed drive, semiconductor equipment over‑current & short‑circuit protection |
| Customization Support | Custom design & specifications available upon customer requirement |
| Part Number | Rated Current(A) | Pre‑arcing I²t(A²s) | Clearing I²t(A²s) | Power Loss(W) | Rated Voltage(V) |
|---|---|---|---|---|---|
| H14FD01 / H14FF01 | 1 | 0.2 | 0.3 | 1.15 | 690V/700V |
| H14FD02 / H14FF02 | 2 | 0.9 | 1.8 | 1.75 | 690V/700V |
| H14FD04 / H14FF04 | 4 | 6.7 | 13 | 2.90 | 690V/700V |
| H14FD06 / H14FF06 | 6 | 8.0 | 35 | 2.00 | 690V/700V |
| H14FD08 / H14FF08 | 8 | 4.3 | 40 | 2.25 | 690V/700V |
| H14FD10 / H14FF10 | 10 | 4.3 | 45 | 2.95 | 690V/700V |
| H14FD12 / H14FF12 | 12 | 5.4 | 60 | 4.10 | 690V/700V |
| H14FD16 / H14FF16 | 16 | 13.1 | 125 | 4.65 | 690V/700V |
| H14FD20 / H14FF20 | 20 | 26.8 | 230 | 4.80 | 690V/700V |
| H14FD25 / H14FF25 | 25 | 52.5 | 385 | 5.95 | 690V/700V |
| H14FD32 / H14FF32 | 32 | 96.7 | 700 | 6.90 | 690V/700V |
| H14FD40 / H14FF40 | 40 | 210 | 1050 | 7.80 | 690V/700V |
| H14FD50 / H14FF50 | 50 | 200 | 1800 | 9.00 | 690V/700V |
| H14FD63 / H14FF63 | 63 | 617 | 2900 | 12.50 | 690V/700V |
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