Mersen Protistor C300198 (A070UD32KI550) — Protistor® Size 32 aR Semiconductor Fuse, 550 A, 690 VAC (IEC) / 700 VAC (UL), Bolted Slotted‑Blade Terminals, Striker Indication — Pack of 3

The Mersen Protistor C300198 (catalog A070UD32KI550) is a square‑body, ultra‑fast acting aR semiconductor fuse‑link, size 32, engineered for high‑performance protection of power semiconductors (diodes, thyristors, IGBT). Rated for 550 A and 690 VAC (IEC) / 700 VAC (UL), this bolted, slotted‑blade terminal version includes a striker indication system and delivers high interrupting capacity with controlled I²t characteristics for optimized equipment protection.

Key specifications

• Manufacturer: Mersen (Protistor® series)
• Catalog number / Item number: A070UD32KI550 / C300198
• Series: Protistor® — Size 32 (aR characteristic)
• Ampere rating: 550 A
• Voltage rating: 690 V AC (IEC) / 700 V AC (UL)
• Utilization category / characteristic: aR (ultra‑fast acting for semiconductor protection)
• Fuse size: 32
• Mounting: Bolted (slotted blade connection)
• Connection / terminal type & material: Slotted blades, silver‑plated copper
• Body / insulating material: Ceramic (square body)
• Indication system: Yes — striker (low‑voltage trip indicator compatible with microswitch)
• Clearing I²t at rated voltage: 215 kA²·s
• Melting I²t: 37 kA²·s
• Maximum AC interrupting rating (I1): 200 kA
• Power dissipation at rated current: 95 W
• Dimensions: 134 mm (length) × 59 mm (width) × 65 mm (height)
• Weight (per unit): 0.5523 kg; Sell pack: 3 EA, pack weight 1.6569 kg
• Compliance: RoHS compliant
• Application: Semiconductor protection in power converters, inverters, UPS, motor drives and other high‑power electronic systems.

Features & benefits

• Very low I²t and controlled arcing (die‑cut elements embedded in solidified sand) reduce thermal and surge stress on semiconductors during fault interruption.
• High interrupting capacity (200 kA) for demanding industrial installations.
• Striker indication provides clear blown‑fuse signalling and enables field‑mountable microswitch integration for remote indication.
• Silver‑plated contact surfaces and non‑magnetic hardware ensure reliable low‑resistance connections and corrosion resistance.
• Ceramic square‑body design for thermal stability and robust mechanical performance.

Applications

• Protection of power semiconductor assemblies: diode/thyristor stacks, IGBT modules, rectifiers and DC/AC converters.
• Industrial power electronics, renewable energy inverters, traction, UPS and large motor drives.

Installation & handling notes

• Replace only with identical Protistor® size 32 aR fuse‑links to maintain proper protective characteristics and coordination.
• Ensure bolted mounting torque and terminal connections per Mersen installation instructions.
• Verify coordination with upstream protection and equipment short‑circuit ratings.
• Use striker/microswitch wiring per the manufacturer’s diagram for reliable indication.

Documentation & support

• Refer to Mersen Protistor technical datasheets for detailed time‑current curves, dimensional drawings, mounting instructions and coordination examples.