Application Scenarios:
A steel rolling mill operating a 2.2 MW ABB ACS880 medium-voltage drive suddenly experienced a phase-to-phase short on the inverter DC link caused by insulation breakdown in a bus duct. Within less than 5 ms of fault inception, the ABB 170M5388 (PC72UD13C250T) fuses installed in series with the positive and negative DC busbars cleared the 80 kA prospective fault current. Because the 170M5388 limited the I²t energy to well below the IGBT module’s withstand capability, only the fuses opened while all six IGBT phases survived intact. The maintenance team simply replaced the three fused elements and restarted production the same shift. Without the correctly specified ABB 170M5388, the short would almost certainly have resulted in a “blown module” cascade—costing upwards of $40,000 in spares and days of lost production. This illustrates why using a generic gG fuse in place of the 170M5388 is a false economy that puts the entire drive at risk.
Parameter:
| Main Parameters | Value/Description |
|---|---|
| Product Model | 170M5388 (Ref: PC72UD13C250T, Order No: 3AUA0000090404) |
| Manufacturer | ABB (Protistor® / 170M Series) |
| Product Category | High Speed Semiconductor Protection Fuse (aR Class, Partial-Range Breaking) |
| Rated Current (In) | 250 A |
| Rated Voltage (Un) | 690 V AC / up to 700 V DC (depending on circuit L/R) [Verify DC applicability per application] |
| Breaking Capacity | ≥ 100 kA @ 690 V AC [Can safely interrupt severe short-circuit faults] |
| Utilization Category | aR (Fast-acting, semiconductor protection — NOT for general cable protection) |
| Pre-arcing I²t | Very Low — typically < 15,000 A²s @ rated voltage [Protects IGBT/thyristor let-through limit] |
| Mounting Type | Bolted Tag / Blade Tag (M10 or M12 holes), DIN 43620 compatible |
| Body Material | High-strength ceramic tube with quartz sand arc-quenching filler |
| Indicator | Mechanical striker pin (triggers on fuse blow; compatible with microswitch bases) |
| Standards Compliance | IEC 60269-4, UL 248-13/ 14, CSA |
| Operating Temp. Range | -40 °C to +80 °C (ambient; derating may apply above 60 °C) |
| Power Dissipation (Typ.) | ~18–22 W @ rated current (check latest ABB curve sheet) |
Technical Principles and Innovative Values:
The ABB 170M5388 (PC72UD13C250T) is engineered around the principle of energy limitation rather than simple overcurrent interruption.
- Innovation Point 1 — Ultra-Low I²t Energy Limitation: The silver-element geometry is precisely calculated so that, under short-circuit conditions, the fuse melts and quenches the arc within the first half-cycle. This restricts the let-through I²t to a fraction of what a standard gG fuse would pass, directly matching the short-time thermal withstand of modern IGBT/thyristor dies and preventing module destruction.
- Innovation Point 2 — Quartz-Sand Arc Quenching & High Withstand: The ceramic body is filled with graded quartz sand that de-ionizes the arc plasma almost instantly after element melt. Combined with the robust ceramic envelope, this enables safe interruption of >100 kA without case rupture or ejection of hot particles—critical for enclosed drive cubicles.
- Innovation Point 3 — Striker-Compatible Mechanical Indication: An integrated mechanical striker pin pops outward upon element rupture. When mounted in a fuse base equipped with a microswitch (e.g., ABB OT series bases), this can trigger a remote alarm or interlock signal, dramatically reducing MTTR by making the faulted phase immediately identifiable during troubleshooting.
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