Mersen A70QS200-4K Semiconductor Fuse 700V

Product Description

The MERSEN A70QS200-4K is a semiconductor protection fuse rated for 700 volts, designed to provide fast-acting overcurrent protection for solid-state power components. Semiconductor fuses are engineered to respond far more quickly than standard industrial fuses, limiting the energy let-through during a fault event to protect SCRs, IGBTs, diodes, and similar devices. This fuse is a trade-grade component installed by licensed electricians and power electronics technicians working on variable frequency drives, rectifiers, converters, and other solid-state power systems.

This fuse is suited for industrial and commercial power electronics applications where protecting sensitive semiconductor devices from overcurrent damage is critical. Typical installation scenarios include VFD panels, DC bus protection circuits, power conversion equipment, and motor drive assemblies. It is selected when the application demands a current-limiting fuse with a voltage rating appropriate for 700-volt-class systems.

Key Features

• 700-volt rating suitable for medium-voltage semiconductor protection circuits
• Fast-acting current-limiting design minimizes energy let-through during fault conditions
• Intended for direct protection of SCRs, IGBTs, diodes, and related solid-state devices
• OEM-style form factor supports straightforward replacement in existing fuse holders

Compatibility

Designed as an OEM-style replacement semiconductor fuse for 700-volt-class power electronics equipment requiring fast-acting current-limiting overcurrent protection.

Installation Notes

Installation and replacement should be performed by a qualified electrician or power electronics technician. De-energize and lock out the equipment fully before servicing any fuse in a high-voltage power electronics panel, following NFPA 70E arc flash and lockout/tagout procedures. Verify that the replacement fuse voltage rating, current rating, and physical form factor match the original fuse specification exactly before installation. Do not use a standard time-delay or general-purpose fuse as a substitute for a semiconductor-rated fuse in these applications.

Technical Specifications

• Voltage Rating: 700 volts
• Fuse Type: Semiconductor protection, current-limiting
• UPC: 78200114136

Standard Information

• Brand: MERSEN
• Manufacturer Part Number: A70QS200-4K