Cooper Bussmann FWH-70B High-Speed Semiconductor Fuse

Description:

The Bussmann FWH-70B Fuse is a high-speed semiconductor fuse designed to provide fast-acting overcurrent protection for power semiconductors, variable frequency drives (VFDs), DC drives, UPS systems, and power conversion equipment. Commonly installed in industrial motor drives, rectifiers, inverters, and power distribution systems requiring rapid fault interruption to protect sensitive electronic components. Maintenance teams, OEMs, and electrical technicians use this fuse for replacement and preventive maintenance in industrial electrical systems.

Applications:

The Bussmann FWH-70B Fuse is used in variable frequency drives, DC common bus systems, UPS systems, rectifiers, inverters, soft starters, and industrial automation equipment. Its high-speed operation limits fault energy, helping protect SCRs, diodes, IGBTs, and other semiconductor devices from damage caused by short circuits and overload conditions.

Technical Specifications:

• Manufacturer: Bussmann (Eaton)
• Manufacturer Part Number (MPN): FWH-70B
• Product Type: High-speed semiconductor fuse
• Function: Fast-acting overcurrent protection for semiconductor devices
• Current Rating: 70 A
• Voltage Rating: 500 VAC / 500 VDC
• Fuse Class: aR semiconductor protection
• Interrupt Rating: 200 kA (AC)
• Body Style: Center-bolted (blade end)
• Mounting Type: Bolt mount
• Fuse Indicator: Non-indicating
• Construction Material: Ceramic body
• Compatible Equipment: VFDs, DC drives, UPS systems, power converters, rectifiers, and industrial power supplies
• Operating Environment: Industrial electrical and power conversion applications
• Application: Semiconductor and power electronics protection
• Designed For: Fast fault interruption to protect sensitive power electronic devices from overcurrent damage.

Common Replacements:

• Eaton Bussmann FWH-70BC High-Speed Fuse
• Mersen A70QS70 Semiconductor Fuse (verify electrical compatibility)
• Littelfuse L70S070 Semiconductor Fuse