Why Choose the Wöhner 31220 Cylindrical Semiconductor Fuse Link?
The Wöhner 31220 is a premium 14 × 51 mm cylindrical semiconductor fuse link engineered to deliver 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 31220 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 40 A, a 690 V AC voltage rating and a high 200 kA breaking capacity, the Wöhner 31220 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.
- 40 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.
- 40 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 31220 is engineered to interrupt fault currents extremely quickly, helping to minimise thermal and electrical stress on expensive semiconductor devices. Its fast-acting gR characteristic limits let-through energy, improving equipment reliability while extending the service life of industrial power electronic systems.
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.
