Wöhner 31212 10 x 38 mm cylindrical semiconductor fuse link rated at 20 A, 690 V AC with gR operating class for industrial semiconductor protection.
£10.50
The Wöhner 31212 is a premium 10 × 38 mm cylindrical semiconductor fuse link designed to provide rapid and dependable protection for sensitive power electronic equipment. Manufactured by Wöhner, this IEC-compliant fuse is specifically engineered to protect semiconductors including IGBTs, thyristors, rectifiers and power converters against overloads and short circuits.
Designed in accordance with IEC 60269-1 and IEC 60269-4, the Wöhner 31212 features a gR operating class, providing full-range protection for semiconductor devices. Its robust porcelain body offers excellent thermal performance, while the compact 10 × 38 mm format ensures compatibility with 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 31212 is ideally suited to industrial automation, variable frequency drives, servo systems, UPS equipment and power conversion applications where rapid fault interruption is essential.
The Wöhner 31212 is engineered to interrupt fault currents extremely quickly, helping to protect valuable semiconductor devices from thermal and electrical damage. Its fast-acting gR characteristic minimises let-through energy, improving equipment reliability while extending the service life of industrial power electronic systems.
Its compact IEC-standard construction enables straightforward installation into compatible fuse holders used in industrial control panels, converters, inverters, servo drives and automation equipment where reliable semiconductor protection is essential.
| Current | 20 A |
|---|---|
| Manufacturer | Wöhner |
| Model | 31212 |
| Product type | Cylindrical semiconductor fuse link |
| Rated current | 20 A |
| Rated voltage | 690 V AC |
| Fuse size | 10 × 38 mm |
| Operating class | gR |
| Breaking capacity | 200 kA AC |
| Standards | IEC 60269-1 / IEC 60269-4 |
| Power dissipation | 5.8 W |
| Material | Porcelain |
| Halogen free | Yes |
| Dimensions (W × H × D) | 10 × 10 × 38 mm |
It is designed to protect semiconductor devices such as IGBTs, thyristors, rectifiers and power converters against overloads and short circuits.
The Wöhner 31212 has a 20 A rated current.
It is suitable for electrical systems operating up to 690 V AC.
The gR operating class provides fast full-range protection specifically developed for semiconductor devices and sensitive power electronic equipment.
The Wöhner 31212 is designed for standard 10 × 38 mm IEC cylindrical fuse holders.
Wöhner semiconductor fuse links are trusted by panel builders, OEM manufacturers and automation engineers for dependable protection of sensitive power electronic equipment in demanding industrial environments.
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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...