Why Choose the Mersen L221132 High-Speed Semiconductor Fuse?
The Mersen L221132 is a high-performance Protistor® high-speed cylindrical fuse-link designed to protect sensitive power semiconductor devices against damaging overloads and short-circuit currents. Identified by catalogue number FD14GB44V20T, it forms part of Mersen’s 14 × 51 mm gLB range developed specifically for reliable DC semiconductor protection.
This fuse-link combines rapid fault interruption with a full-range gLB operating characteristic, enabling it to protect against both overloads and high-level short circuits. By limiting the energy passed through during a fault, the L221132 helps reduce thermal and electrical stress on rectifiers, inverters, thyristors and other sensitive power electronic components.
With a rated current of 20 A, an IEC voltage rating of 440 V DC and a compact 14 × 51 mm cylindrical format, the Mersen L221132 is suitable for industrial converters, DC power supplies, railway auxiliary equipment and semiconductor protection circuits. Its integrated striker provides clear fuse-operation indication for easier inspection and maintenance.
Key Advantages
- High-speed fuse-link designed for power semiconductor protection.
- 20 A rated current for industrial DC circuits.
- 440 V DC IEC voltage rating.
- gLB characteristic provides overload and short-circuit protection.
- High interrupting capability supports dependable fault clearance.
- Integrated mechanical striker simplifies fuse-status identification.
Key Features
- Mersen Protistor® semiconductor fuse range.
- FD14GB44V20T catalogue number.
- 20 A rated current.
- 440 V DC rated voltage.
- gLB high-speed semiconductor protection characteristic.
- Compact 14 × 51 mm cylindrical fuse-link design.
- Integrated mechanical striker indication.
- Ferrule terminals for clip-mounted installation.
- Designed for sensitive power electronic equipment.
- RoHS-compliant construction.
Reliable Protection for DC Power Electronics
Power semiconductor components can be permanently damaged by overcurrents that develop in only a fraction of a second. High-speed fuse-links such as the Mersen L221132 interrupt these faults rapidly, limiting the electrical energy reaching sensitive components and helping prevent extensive equipment damage.
The Mersen Protistor® 14 × 51 gLB range is engineered for compact DC installations requiring reliable overload and short-circuit protection. Its cylindrical format, high interrupting performance and integrated striker make it suitable for modern industrial power conversion and automation equipment.
Typical Applications
- Industrial rectifiers and converters.
- Power inverters.
- DC power supplies.
- Uninterruptible power supply systems.
- Railway auxiliary power circuits.
- Power semiconductor protection circuits.
