Ferraz Shawmut Amp-trap A30QS800-4 High-Speed Semiconductor Fuse

The Ferraz Shawmut Amp-trap A30QS800-4 High-Speed Semiconductor Fuse is a massive, ultra-fast-acting circuit protection device engineered for heavy industrial power electronics. Operating under the "aR" class, this fuse is specifically designed to provide lightning-fast clearing times to protect sensitive and expensive power semiconductors (such as diodes, SCRs, thyristors, and solid-state relays) from catastrophic short-circuit damage.

Key Specifications:

• Category: Industrial Electrical / Circuit Protection / Semiconductor Fuses

• Product Type: High-Speed Semiconductor Fuse (Fast-Acting / aR Class)

• Manufacturer: Ferraz Shawmut (Now Mersen)

• Product Line: Amp-trap®

• Model / Part Number: A30QS800-4

• Current Rating: 800 Amps (800A)

• Maximum Voltage Rating: 300V AC / 300V DC

• Interrupting Rating (Breaking Capacity): 200kA at 300VAC / 100kA at 300VDC

• Mounting Type: Bolted flat blade terminals (Form 4 style)

• Certifications: UL Recognized (cURus), CE Compliant

• Origin: Made in Mexico (Stamped on metal blade)

• Body Material: High-strength, thermal-resistant fiberglass/melamine composite (GMG)

Key Features:

• Ultra-Fast aR Class Protection – Unlike standard general-purpose fuses, this unit features an extremely low $I^2t$ (let-through energy) rating. It is designed to blow in milliseconds to clear massive faults before heat can destroy expensive power electronics in motor drives and inverters.

• Immense Interrupting Capacity – Capable of safely absorbing and extinguishing catastrophic dead-short fault currents up to a staggering 200,000 Amps (AC) and 100,000 Amps (DC) without the outer casing rupturing or catching fire.

• Arc-Extinguishing Construction – The high-strength cylindrical tube is internally packed with specialized, high-purity silica sand that instantly melts into glass during a blown-fuse event, safely suffocating the violent electrical arc.

• Heavy-Duty Bolted Design – Features thick, solid metal blade terminals with pre-cut holes. This provides massive surface area contact for heavy-gauge copper busbars, ensuring secure, low-resistance power transfer.

Ideal For:

• Protecting heavy industrial AC and DC motor drives / Variable Frequency Drives (VFDs)

• Uninterruptible Power Supply (UPS) systems and heavy-duty rectifiers

• Megawatt-scale solar (PV) and wind inverter protection

• High-current, low-voltage DC applications (forklifts, industrial material handling, or custom EV traction setups running under 300VDC)

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