Wöhner 31512 Mersen A4J Class J fast-acting cylindrical fuse link rated at 40 A, 600 V AC and 300 V DC with a 200 kA interrupting capacity for industrial branch-circuit protection.
£56.17
The Wöhner 31512 is a premium Class J fast-acting cylindrical fuse link designed to provide rapid overcurrent and short-circuit protection for industrial branch circuits. Manufactured using the Mersen A4J fuse series, it complies with UL 248-1 and UL 248-8 standards, making it ideal for industrial control panels, switchgear, motor control centres and OEM machinery.
With a 40 A rated current, 600 V AC and 300 V DC ratings, the Wöhner 31512 delivers rapid fault interruption to protect conductors and sensitive electrical equipment against overloads and short circuits. Its fast-acting characteristic makes it particularly suitable for branch-circuit applications requiring immediate fault isolation.
Manufactured with a durable porcelain body, the fuse features a compact Class J 27 × 60 mm construction and provides an impressive 200 kA AC interrupting capacity with 100 kA DC SCCR, ensuring dependable protection in demanding industrial environments.
The Wöhner 31512 is engineered to interrupt fault currents almost instantly, helping minimise damage to conductors, electrical components and industrial equipment. Its fast-acting characteristic makes it ideal for branch circuits and sensitive electrical systems where rapid fault isolation is essential.
Its compact Class J construction, high interrupting capacity and recognised UL and CSA approvals make it an excellent choice for industrial automation systems, OEM machinery, switchgear and electrical distribution equipment requiring dependable branch-circuit protection.
| Current | 40 A |
|---|---|
| Manufacturer | Wöhner |
| Model | 31512 |
| Type number | A4J |
| Product type | Class J fast-acting fuse link |
| Rated current | 40 A |
| Rated voltage AC | 600 V AC |
| Rated voltage DC | 300 V DC |
| Rated frequency | 50 / 60 Hz |
| Fuse size | Class J, 27 × 60 mm |
| Operating characteristic | Fast acting |
| Interrupting capacity AC | 200 kA |
| SCCR DC | 100 kA |
| Primary application | Branch circuit protection |
| Standards | UL 248-1, UL 248-8 |
| Approvals | UL, CSA |
| UL file | E2137 |
| CSA file | 12636 |
| Body material | Porcelain |
| Halogen-free | Yes |
| Dimensions (W × H × D) | 27 × 60 × 27 mm |
| Weight | Approx. 8.5 g |
| Pack quantity | 10 |
| EAN | 4021267315122 |
The Wöhner 31512 provides fast-acting overcurrent and short-circuit protection for industrial branch circuits and electrical equipment.
The Wöhner 31512 has a rated current of 40 A.
The fuse is rated for operation at up to 600 V AC and 300 V DC.
Fast-acting fuses disconnect fault currents immediately, helping protect sensitive electrical equipment and conductors from overload and short-circuit damage.
The Wöhner 31512 is a Class J 27 × 60 mm fuse link and should be installed in a compatible Class J fuse holder.
Wöhner Class J fuse links are trusted by panel builders, OEM manufacturers and industrial maintenance professionals for delivering dependable branch-circuit protection, exceptional interrupting capacity and long-term reliability.
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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...