Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
31345 Wohner fuse link 4 A, 600 V AC, time delay, Class J
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.
£25.43
Why Choose the Wöhner 31345 Class J Fuse Link?
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.
Key Advantages
- Reliable Class J time-delay fuse protection.
- 4 A rated current for industrial control circuits.
- Suitable for systems up to 600 V AC.
- Supports DC applications up to 500 V DC.
- Time-delay operation withstands temporary inrush currents.
- High 200 kA AC interrupting capacity.
- Compact 21 × 57 mm cylindrical design.
Key Features
- Wöhner Class J fuse link.
- Manufactured by Mersen.
- 4 A rated current.
- 600 V AC rated voltage.
- 500 V DC rated voltage.
- Time-delay operating characteristic.
- Class J 30 A frame size.
- 200 kA AC SCCR.
- 100 kA DC SCCR.
- Porcelain, halogen-free construction.
Reliable Time-Delay Protection for Industrial Equipment
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.
Typical Applications
- Industrial control panels.
- Motor branch circuit protection.
- OEM machinery.
- Automation systems.
- Electrical switchboards.
- Industrial AC and DC power distribution.
Technical Specifications
Tick the specs you need, then view products that match.
| 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 |
Frequently Asked Questions
What is the Wöhner 31345 used for?
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.
What is the current rating of the Wöhner 31345?
The fuse has a rated current of 4 A.
What voltage ratings does this fuse support?
The Wöhner 31345 is rated for applications up to 600 V AC and 500 V DC.
Is the Wöhner 31345 a fast-acting fuse?
No. It features a time-delay operating characteristic, allowing temporary inrush currents while protecting against sustained overloads.
Which fuse holders are compatible?
The Wöhner 31345 is designed for compatible Class J fuse holders accepting 21 × 57 mm cylindrical fuse links.
Trusted by Electrical Professionals Worldwide
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.
