Ferraz Shawmut A70QS450-4 Amp Trap Semiconductor Fuse

Description:

The Ferraz Shawmut A70QS450-4 Fuse is a high-speed Amp-Trap® Form 101 semiconductor fuse rated at 450 Amps and 700 VAC/700 VDC, designed to provide ultra-fast overcurrent and short-circuit protection for power semiconductor devices. Commonly installed in variable frequency drives (VFDs), inverters, UPS systems, rectifiers, DC drives, and industrial power conversion equipment where low I²t performance is critical for semiconductor protection. Maintenance technicians and system integrators use this fuse for equipment repair, retrofit, expansion, and replacement to protect IGBTs, SCRs, diodes, and other semiconductor components, improve system reliability, and minimize production downtime.

Applications:

The Ferraz Shawmut A70QS450-4 Fuse is used to protect high-power semiconductor devices against overload and short-circuit faults in industrial power electronic systems. It is commonly utilized in motor drives, uninterruptible power supplies (UPS), battery chargers, induction heating equipment, renewable energy inverters, welding machines, and DC power conversion systems requiring high-speed current-limiting fuse protection.

Technical Specifications:

• Manufacturer: Ferraz Shawmut (Now Mersen)
• Part Number: A70QS450-4
• Product Type: High-Speed Semiconductor Fuse
• Series: Amp-Trap® A70QS Form 101
• Current Rating: 450 A
• Voltage Rating: 700 VAC / 700 VDC
• Interrupting Rating: 200 kA AC / 100 kA DC
• Frequency: 50/60 Hz
• Fuse Style: Bolted Blade (Form 101)
• Fuse Type: Fast-Acting, Current-Limiting
• Application: Semiconductor Protection
• Mounting Style: Bolt-On
• Standards: UL Recognized, RoHS, REACH Compliant

Common Replacements:

• Mersen A70QS450-4K
• Mersen A70QS450-4IL
• Mersen A70QS450-4KIL