HIITIO HCHVT750 High-Voltage DC Main Fuse

The HIITIO HCHVT750 High-Voltage DC Main Fuse is an ultra-fast-acting, square-body circuit protection device engineered for the rigorous demands of electric vehicles (EVs), power inverters, and heavy-duty renewable energy architectures. Rated for a massive 400 Amps at 750 Volts DC, this "Size 000" fuse features an "aR" operating class, meaning it is specifically designed to provide lightning-fast short-circuit protection for sensitive power semiconductors (like IGBTs and MOSFETs) found in EV drive inverters.

Key Specifications:

• Category: Automotive Parts & Accessories / EV High Voltage Components / Fuses & Circuit Breakers

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

• Manufacturer: HIITIO (Zhejiang Hecheng Smart Electric Co., Ltd.)

• Model / Part Number: HCHVT750 (Size: 000)

• Current Rating: 400 Amps (400A)

• Maximum Voltage Rating: 750V DC

• Interrupting Rating (Breaking Capacity): 50kA (50,000 Amps)

• Time Constant: t ≤ 2±1ms

• Mounting Type: Bolted slotted blade terminals

• Industry Standards: UL248-13, IEC60269-4

• Certifications: RoHS Compliant

• Body Material: High-strength, thermal-resistant square ceramic/fiberglass body

Key Features:

• aR Class Semiconductor Protection – Unlike general-purpose fuses, this unit is ultra-fast acting. It is explicitly designed to clear massive DC short circuits in milliseconds, preventing catastrophic damage to the expensive power electronics inside EV motor controllers and inverters.

• Massive 50kA Breaking Capacity – Can safely absorb and extinguish dead-short fault currents up to a staggering 50,000 Amps without the square casing rupturing, melting, or catching fire.

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

• Severe-Duty Bolted Design – Features thick, heavy-duty slotted metal blade terminals that are screwed directly into the end plates. This provides maximum surface area contact for high-current transfer and ensures the fuse remains completely secure under heavy road vibrations.

Ideal For:

• Main traction battery disconnects and drive inverter protection in Electric Vehicles

• High-performance EV conversions requiring dedicated semiconductor protection

• Megawatt-scale Solar (PV) inverters and grid-tied combiner boxes

• Commercial Battery Energy Storage Systems (BESS)

• High-power DC Fast Charging (DCFC) station infrastructure

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