Wöhner 31345 Mersen Class J time-delay cylindrical fuse link rated at 4 A, 600 V AC and 500 V DC for industrial overcurrent protection.
£31.79
The Wöhner 31345 is a high-quality Class J time-delay cylindrical fuse link designed to provide dependable overload and short-circuit protection in industrial electrical systems. Manufactured by Mersen for the Wöhner product range, it is ideal for protecting circuits that experience temporary inrush currents, such as motors, transformers and industrial control equipment.
Rated at 4 A, the Wöhner 31345 operates at up to 600 V AC and 500 V DC. Its time-delay characteristic prevents nuisance operation during equipment start-up while providing rapid interruption of sustained overloads and high fault currents.
Designed in the compact 21 × 57 mm Class J format, the fuse installs easily into compatible Class J fuse holders. Its robust porcelain, halogen-free construction delivers reliable thermal and mechanical performance in demanding industrial environments.
The Wöhner 31345 is designed to tolerate temporary current surges while delivering dependable protection against sustained overloads and short-circuit faults. This makes it ideal for motor circuits, transformers, industrial automation systems and control panels where equipment start-up currents are common.
Installed in a compatible Class J fuse holder, the fuse helps maximise equipment protection while reducing unnecessary downtime caused by nuisance fuse operation.
| Current | 4 A |
|---|---|
| Manufacturer | Wöhner |
| Fuse manufacturer | Mersen |
| Model | 31345 |
| Alternative SKU | 31345000 |
| Product type | Cylindrical fuse link |
| Fuse class | Class J |
| Frame size | Class J 30 A |
| Operating characteristic | Time delay |
| Rated current | 4 A |
| Rated voltage AC | 600 V |
| Rated voltage DC | 500 V |
| Rated frequency | 50 / 60 Hz |
| AC short-circuit current rating | 200 kA |
| DC short-circuit current rating | 100 kA |
| Dimensions (W × H × D) | 21 × 57 × 21 mm |
| Material | Porcelain |
| Halogen-free | Yes |
| Standards | UL 248-8, UL 248-1 |
| GTIN / EAN | 4021267313456 |
| Pack quantity | 10 |
| Weight | Approx. 50 g per fuse |
The Wöhner 31345 is a Class J time-delay fuse link designed to protect industrial electrical circuits from overloads and short circuits while allowing temporary inrush currents.
The fuse has a rated current of 4 A.
The Wöhner 31345 is rated for applications up to 600 V AC and 500 V DC.
No. It features a time-delay operating characteristic, allowing temporary inrush currents while protecting against sustained overloads.
The Wöhner 31345 is designed for compatible Class J fuse holders accepting 21 × 57 mm cylindrical fuse links.
Wöhner Class J fuse links are trusted by panel builders, OEM manufacturers and industrial electricians for delivering dependable overcurrent protection and reliable performance in demanding industrial electrical installations.
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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...