Product Overview

The ABB 170M5388​ is an ultra‑fast acting, aR‑characteristic (partial‑range / semiconductor‑protecting) square‑body fuse belonging to ABB’s renowned Protistor® 170M series, designed expressly to protect power semiconductors—IGBTs, thyristors (SCRs), diodes, and power modules—from destructive short‑circuit currents in AC variable frequency drives (VFDs), DC link circuits of inverter sections, soft starters, UPS systems, and renewable‑energy power converters. Rated at 250 amperes with a maximum operating voltage of 690 V AC (50/60 Hz) and 700 V DC, the 170M5388​ features an extremely low pre‑arcing I²t value and a breaking capacity of 100 kA, ensuring that even severe prospective fault currents are interrupted within a few milliseconds—well before the vulnerable power semiconductor reaches its damage threshold. The fuse body conforms to DIN 43653 / IEC 60269‑4 dimensions for Size 2 (often referred to as 000/00/2 format) square‑body fuses, with silver‑plated copper blade (knife) contacts for bolt‑in mounting in a compatible fuse base or isolator.In ABB drive systems such as the ACS800, ACS880, and ACS350/510 families, the ABB 170M5388​ is frequently specified as the line‑side or DC‑link protective device because its time‑current characteristic is coordinated with the drive’s own over‑current protection and the short‑circuit withstand of the internal power stack. The legacy ordering reference PC72UD13C250T​ (now superseded by ABB ID 3AUA0000090404 pointing to 170M5388) was the Cooper Bussmann / former GEC Alsthom cross that ABB absorbed into its Protistor portfolio—meaning the 170M5388​ is a direct form‑fit‑function replacement in panels originally built with the older PC72UD part. By limiting let‑through energy (I²t) and peak let‑through current (Ip), the ABB 170M5388​ preserves expensive drive modules, reduces arc‑flash incident energy in the enclosure, and often allows the use of smaller upstream disconnects or circuit breakers than would be required with general‑purpose gG fuses.Procurement and maintenance teams value the ABB 170M5388​ for its globally recognized approvals (IEC 60269‑4, UL recognized, CSA), clear rupture indicator (striker pin or fusing element flag on most 170M bodies), and broad availability as a standard spare for both new ABB drive installations and legacy systems originally fitted with Bussmann / Ferraz aR fuses of the same size and rating.

Technical Specifications