Wöhner 31217 14 x 51 mm cylindrical semiconductor fuse link rated at 20 A, 690 V AC with gR operating class for industrial semiconductor protection.
£13.22
The Wöhner 31217 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 31217 features a gR operating class, delivering full-range semiconductor protection. Its robust porcelain body provides excellent thermal performance, while the 14 × 51 mm format enables simple installation into standard cylindrical fuse holders.
With a rated current of 20 A, a 690 V AC voltage rating and a high 200 kA breaking capacity, the Wöhner 31217 is ideally suited to industrial automation, variable frequency drives, UPS systems, servo drives and power conversion equipment where rapid fault interruption is essential.
The Wöhner 31217 is engineered to interrupt fault currents extremely quickly, helping to minimise thermal stress and prevent costly damage to sensitive semiconductor components. Its fast-acting gR characteristic limits let-through energy, improving system reliability while extending the operational life of industrial power electronic equipment.
Its compact IEC-standard construction enables straightforward installation into compatible 14 × 51 mm fuse holders used in industrial control panels, converters, inverters, motor drives, UPS systems and automation equipment where dependable semiconductor protection is essential.
| Current | 20 A |
|---|---|
| Manufacturer | Wöhner |
| Model | 31217 |
| Product type | Cylindrical semiconductor fuse link |
| Rated current | 20 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 | 6.0 W (full load) |
| Power dissipation (80% load) | 3.8 W |
| Material | Porcelain |
| Halogen free | Yes |
| Dimensions (W × H × D) | 14 × 14 × 51 mm |
It is designed to protect semiconductor devices including IGBTs, thyristors, rectifiers and power converters against overloads and short circuits.
The Wöhner 31217 has a 20 A rated current.
It is designed for electrical systems operating up to 690 V AC (700 V AC UL).
The gR operating class provides fast full-range protection specifically developed for semiconductor devices and other sensitive power electronic equipment.
The Wöhner 31217 is designed for standard 14 × 51 mm IEC cylindrical fuse holders.
Wöhner semiconductor fuse links are trusted by OEMs, panel builders and industrial automation engineers worldwide for dependable protection of valuable power electronic equipment.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...