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Description
Application Scenarios:
A 250 kW ACS880 drive on a 690 V mining conveyor trips on overcurrent at 3 a.m. The maintenance crew opens the cabinet and finds one phase of the input bridge shorted and the IGBT module cracked. The post-mortem question is never “why did the semiconductor fail” — it is “why did the protection not clear first.” In a well-specified lineup the answer is visible on the busbar: the 170M5388 in that phase has operated, its centre striker pin popped, and the fault stopped there. The drive needs a fuse and a bridge module. In a badly specified one, the wrong fuse was fitted, it did not clear in time, and the fault propagated into the DC link and the inverter section.That is the load-bearing role 3AUA0000090404 plays in a power cabinet. It sits in series on the DC-link positive or on the AC incoming side, immediately adjacent to the semiconductor it protects, and for years it does nothing at all except carry rated current and dissipate about 65 W. Then, on the worst day of the asset’s life, it has a few milliseconds to make a decision that determines whether the outage costs a fuse or a power stack.The pain points it addresses are specific and expensive. Semiconductor short-circuit withstand is measured in microseconds, so any protection slower than a high-speed fuse is not protection at all. Prospective fault current on a stiff 690 V bus can reach 150–180 kA, which ruptures a fuse not rated for it and turns a contained fault into an arc-flash event. And a misapplied general-purpose fuse creates the worst of both worlds — either it fails to clear and the IGBT avalanches, or it nuisance-opens on normal drive inrush and costs a production stop. PC72UD13C250T exists so that neither outcome is possible.The same logic applies wherever expensive silicon meets a stiff supply: DC common bus systems feeding multiple inverters, DC drives, rectifier and converter fronts, soft starters, UPS rectifier inputs, and PV or wind converter power sections.
Parameter:
Figures below are taken from the manufacturer’s published specification for catalogue number 170M5388. Note that many reseller listings quote 690 V / 700 V DC; the official IEC rating of the fuse link is 1250 V AC (1300 V UL), and 690 V refers to the system voltage of the drives in which ABB typically installs it.
| Main Parameters | Value / Description |
|---|---|
| Product Model | 170M5388 (technical designation PC72UD13C250T) |
| Manufacturer | ABB (order code 3AUA0000090404); fuse manufactured by Eaton Bussmann, 170M high-speed series |
| Product Category | High-speed square-body fuse link, aR class, for semiconductor protection |
| Rated Current | 250 A — continuous carry at rated conditions including drive overload cycles |
| Rated Voltage | 1250 V AC (IEC), 1300 V AC (UL recognised) |
| Breaking Capacity | 100 kA — safely interrupts very high prospective fault current without body rupture |
| Utilisation Category | aR (accompanied semiconductor protection, partial-range breaking per IEC 60269-4) |
| Pre-Arcing I²t | 6500 A²s — the energy absorbed before the arc forms; this is the figure matched against the semiconductor’s own withstand |
| Total Clearing I²t | 38 500 A²s at 1000 V; 51 500 A²s at 1250 V — total let-through energy the protected device actually sees |
| Watt Loss | 65 W at rated current — the heat the fuse adds to the cabinet continuously, a real input to thermal design |
| Fuse Size | Size 2, square body with flush-end contacts (BKN/75) |
| Contacts | Silver-plated copper flush-end blades, low and stable contact resistance |
| Mounting | M10 fixing, 74.3 mm centre-to-centre connection distance |
| Status Indication | Centre fuse status indicator, Type K striker pin for microswitch — drives a remote “fuse blown” alarm or PLC digital input |
| Body Dimensions | 61 × 75 × 77 mm (body); overall 168 mm length × 124 mm width × 80 mm height |
| Net Weight | 743.5 g |
| Construction | Ceramic arc-quenching body, quartz sand filler, silver element — arc contained internally, no venting into the cubicle |
| Standards and Approvals | IEC 60269-4 flush-end connections type A, UL Recognised, CE marked, RoHS compliant |
| Typical Applications | Semiconductor protection, DC common bus, DC drives, power converters and rectifiers, soft starters, UPS rectifier fronts |
