FWH-300A FUSE BUSSMANN

FWH-300A FUSE BUSSMANN – High-Speed 300A 500VAC/VDC Bolt-On Semiconductor Fuse

The FWH-300A FUSE BUSSMANN (Model FWH-300A) is an industrial-grade, ultra-fast semiconductor protection fuse manufactured by Eaton’s Bussmann series. Engineered specifically for overcurrent, short-circuit, and thermal protection of high-power semiconductor components—such as silicon-controlled rectifiers (SCRs), diodes, thyristors, and insulated-gate bipolar transistors (IGBTs)—this $300text{-amp}$ , $500text{ VAC/VDC}$ fuse delivers low thermal energy let-through across industrial power conversion networks.

Featuring a Class aR high-speed operating profile, the FWH-300A FUSE BUSSMANN provides rapid clearing performance under severe electrical fault conditions. It offers a high interrupting capacity rated at $200text{ kA RMS}$ Symmetrical at $500text{ VAC}$ and $50text{ kA}$ at $500text{ VDC}$ . Built in a heavy-duty cylindrical body format with bolted blade end tags, it restricts peak thermal let-through energy ( $I^2t$ ) to protect sensitive solid-state power electronics from damage during short circuits.

Key Features of the FWH-300A FUSE BUSSMANN

Ultra-Fast Semiconductor Protection: Built with Class aR clearing characteristics to protect power semiconductors against short circuits and thermal overload.
Dual $500text{V}$ AC/DC Voltage Rating: Rated for continuous operation at $500text{ VAC}$ and $500text{ VDC}$ , serving both AC mains supplies and DC bus circuits.
High $200text{ kA}$ Interrupting Capacity: Capable of safely interrupting prospective fault currents up to $200text{ kAIC}$ at $500text{ VAC}$ and $50text{ kAIC}$ at $500text{ VDC}$ .
Low Let-Through Energy ( $I^2t$ ): Low pre-arcing and total clearing $I^2t$ limit mechanical and thermal stress on downstream solid-state electronics during severe short circuits.
Heavy-Duty Bolt-On Blade Design: Includes slotted blade terminals for low-resistance, direct bolted connections to copper busbars or stud mounts.
Durable Ceramic Body Construction: Built with a high-strength ceramic casing filled with high-purity silica sand to contain arc energy and thermal stress.

Common Applications and Practical Usage of FWH-300A FUSE BUSSMANN

The ultra-fast clearing speed, $300text{A}$ power capacity, and bolted blade configuration of the FWH-300A FUSE BUSSMANN make it a protective component across high-power industrial installations:

Variable Frequency Drives (VFDs): Protects main AC drive input rectifiers, DC bus links, and inverter modules.
DC Common Bus & Drive Systems: Safeguards DC motor drives, high-power servo amplifiers, and shared DC distribution busbars.
Industrial Power Rectifiers: Protects high-current AC/DC rectifiers, heavy electroplating systems, and battery chargers.
Uninterruptible Power Supplies (UPS): Safely isolates static switches, main inverters, and battery banks in commercial UPS installations.

Technical Specifications of FWH-300A FUSE BUSSMANN

The core electrical, physical, and compliance specifications for the FWH-300A FUSE BUSSMANN are detailed below:

Parameter Specification	Technical Details & Operational Values
Component Classification	High-Speed Bolt-On Semiconductor Fuse
Primary Target Keyword	FWH-300A FUSE BUSSMANN
Brand / Series	Eaton Bussmann Series / FWH High-Speed
Catalog Model / Part No.	FWH-300A
Amperage Rating	$300text{ Amps}$ ( $300text{A}$ )
Voltage Rating	$500text{ VAC}$ / $500text{ VDC}$
Interrupt Rating (IR)	$200text{ kA}$ at $500text{ VAC}$ / $50text{ kA}$ at $500text{ VDC}$
Utilization Category	Class aR (Partial Range Semiconductor Protection)
Watts Loss at Rated Current	Approx. $51text{ W}$
Terminal Connection Type	Bolt-On Slotted Blade Ends (Stud Mount)
Physical Dimensions	$38.1text{ mm}$ x $times 110.2text{ mm}$ Length ( $1.50'' times 4.34''$ )
Body Material & Fill	High-Density Ceramic Tube with Silica Sand Arc Medium
Agency Certifications	UL Recognized (File E91823), CSA Certified, CE, RoHS Compliant

Operating Guidelines and Usage Tips

SAFETY NOTICE: Always isolate power supplies and verify circuits are completely de-energized using a calibrated multi-meter prior to inspecting or replacing high-capacity power fuses.

Busbar Installation: Bolt directly to heavy-gauge copper busbars using hardware, applying recommended torque values to prevent localized overheating from high contact resistance.

Semiconductor Coordination: Ensure that the total clearing energy ( $I^2t$ ) of the fuse is lower than the thermal withstand capability ( $I^2t$ ) of the semiconductor component being protected.

To review official semiconductor high-speed fuse standards and overcurrent protection specifications, consult the National Electrical Manufacturers Association (NEMA) Directory.

To check regional warehouse inventory availability or request commercial quotes for volume electrical fuses, visit the Control Qatar Contact Page.

FWH-300A FUSE BUSSMANN