$99.99
| Voltage | AH/kVA | Length | Width | Height | Weight |
|---|---|---|---|---|---|
| 1000 V | 400 A | 110.24mm | 38.10mm | n/a | .24kg |
| Voltage | 1000 V |
| Amp/H | 400 A |
| Length | 110.24mm |
| Width | 38.10mm |
| Height | n/a |
| Weight | .24kg |
The BUSSMANN FWH-400A is a North American–style high-speed (fast-acting) semiconductor fuse for protecting rectifiers, inverters, and DC common-bus rails in UPS and power-electronic systems. This listing features reclaimed, continuity-tested units removed from decommissioned, fully functional equipment.
High-Speed Protection:
Fast-acting element tailored for semiconductor circuits with tight let-through limits.
Stud-Mount Cartridge Body:
Bolt-down blade terminals for robust, low-impedance connections and easy service.
High Interrupt Ratings:
500 V AC / 500 V DC with 200 kA AC RMS Sym and 50 kA DC interrupt capability.
Reclaimed & Verified:
Every unit is continuity-tested and visually inspected; OEM-new stock available by request.
| Parameter | Value |
| Manufacturer | BUSSMANN (Eaton) |
| Part Number | FWH-400A |
| Fuse Type / Category | High-speed semiconductor fuse (fast-acting), non-indicating |
| Rated Voltage | 500 V AC / 500 V DC |
| Rated Current | 400 A |
| Interrupting Capacity | 200 kA (AC, RMS Sym) | 50 kA (DC) |
| Indicator | None (non-indicating) |
| Body / Size | North American stud-mount cartridge (FWH series), Ø 1.500 in |
| Terminals / Mounting | Bolt-down blade terminals; two 0.25 in holes on 0.75 in centers (stud-mount) |
| Pre-arcing I²t @ 500 V | 19,200 A²s |
| Clearing I²t @ 500 V | 96,700 A²s |
| Power Loss (at rated) | 65 W |
| Dimensions (L × Ø) | 4.340 in × 1.500 in (110.24 mm × 38.10 mm) |
| Approx. Weight | ≈ 0.52 lb (≈ 0.24 kg) |
| Compliance / Approvals | UL Recognized; CSA Component Acceptance; CE-marked; RoHS compliant |
| UPC / EAN | UPC 051712150187 | EAN 5027590061292 |
| Fuse | Compatible UPS/Power-Electronics Models | Notes |
| FWH-400A | Used in UPS frames, DC drives, and converter stacks requiring BUSSMANN FWH high-speed fuses in the 400 A class (stud-mount, bolt-down blades). | Verify bolt-hole geometry (0.25 in on 0.75 in centers) and overall size (≈ 4.340 in × 1.500 in) against the OEM part/BOM. |
