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31221 Wohner cylindr. fuse link 50 A
Wöhner 31221 14 x 51 mm cylindrical semiconductor fuse link rated at 50 A, 690 V AC with gR operating class for industrial semiconductor protection.
£13.77
Why Choose the Wöhner 31221 Cylindrical Semiconductor Fuse Link?
The Wöhner 31221 is a premium 14 × 51 mm cylindrical semiconductor fuse link engineered to provide exceptionally fast and reliable protection for sensitive power electronic equipment. Manufactured by Wöhner, this IEC-compliant fuse is specifically designed to protect semiconductors including IGBTs, thyristors, rectifiers and power converters against overloads and short circuits.
Manufactured in accordance with IEC 60269-1 and IEC 60269-4, the Wöhner 31221 features a gR operating class, providing full-range semiconductor protection. Its high-quality porcelain body offers excellent thermal stability, while the 14 × 51 mm format ensures compatibility with standard cylindrical fuse holders.
With a rated current of 50 A, a 690 V AC voltage rating and a high 200 kA breaking capacity, the Wöhner 31221 is ideally suited for industrial automation, variable frequency drives, UPS systems, servo drives and power conversion equipment where rapid fault interruption is essential.
Key Advantages
- Designed specifically for semiconductor protection.
- 50 A rated current for demanding industrial power electronics.
- 690 V AC operating voltage.
- gR operating class provides fast full-range protection.
- 200 kA breaking capacity for exceptional fault interruption.
- Compatible with standard 14 × 51 mm fuse holders.
Key Features
- Wöhner cylindrical semiconductor fuse link.
- 50 A rated current.
- 690 V AC rated voltage.
- 14 × 51 mm fuse size.
- gR utilisation category.
- 200 kA AC breaking capacity.
- High-quality porcelain body.
- Halogen-free construction.
- Manufactured to IEC 60269-1 and IEC 60269-4.
- IEC (CB) and UL approved.
Fast Protection for Critical Power Electronics
The Wöhner 31221 is engineered to interrupt fault currents extremely quickly, helping to minimise thermal and electrical stress on valuable semiconductor devices. Its fast-acting gR characteristic reduces let-through energy, improving system reliability while extending the operational life of industrial power electronic equipment.
Its IEC-standard construction enables straightforward installation into compatible 14 × 51 mm fuse holders used in industrial control panels, converters, inverters, servo drives, UPS systems and automation equipment where dependable semiconductor protection is essential.
Typical Applications
- Variable frequency drives.
- Servo drive systems.
- Power converters and inverters.
- UPS systems.
- Industrial automation equipment.
- Motor control centres.
- Semiconductor protection circuits.
Technical Specifications
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| Current | 50 A | |
|---|---|---|
| Manufacturer | Wöhner | |
| Model | 31221 | |
| Product type | Cylindrical semiconductor fuse link | |
| Rated current | 50 A | |
| Rated voltage | 690 V AC (700 V AC UL) | |
| Fuse size | 14 × 51 mm | |
| Operating class | gR | |
| Breaking capacity | 200 kA AC | |
| Standards | IEC 60269-1 / IEC 60269-4 | |
| Power dissipation | 12.0 W (full load) | |
| Power dissipation (80% load) | 7.7 W | |
| Material | Porcelain | |
| Halogen free | Yes | |
| Dimensions (W × H × D) | 14 × 14 × 51 mm |
Frequently Asked Questions
What is the Wöhner 31221 used for?
It is designed to protect semiconductor devices including IGBTs, thyristors, rectifiers and power converters against overloads and short circuits.
What is the current rating of this fuse?
The Wöhner 31221 has a 50 A rated current.
What voltage is this fuse suitable for?
It is designed for electrical systems operating up to 690 V AC (700 V AC UL).
What does the gR operating class mean?
The gR operating class provides fast full-range protection specifically developed for semiconductor devices and other sensitive power electronic equipment.
Which fuse holders is this compatible with?
The Wöhner 31221 is designed for standard 14 × 51 mm IEC cylindrical fuse holders.
Trusted for Semiconductor Protection
Wöhner semiconductor fuse links are trusted by OEMs, panel builders and industrial automation engineers worldwide for dependable protection of valuable power electronic equipment.
