Wöhner 31912 DIII locking cap (industry version) for E33 screw fuse systems, rated 500 V AC/DC, designed to restrict access to DIII fuse links.
£53.51
The Wöhner 31912 is a DIII locking cap (industry version) designed for DIII / E33 screw fuse systems. It provides a secure method of preventing unauthorised removal or replacement of DIII fuse links, making it ideal for industrial switchboards, OEM machinery and commercial power distribution systems where controlled fuse access is essential.
Manufactured from durable, halogen-free plastic, the locking cap is suitable for installations operating at 500 V AC and 500 V DC. As it contains no live electrical components, it requires no maintenance while providing dependable long-term protection in demanding industrial environments.
The Wöhner 31912 is supplied as the industry version and is designed for use with the Wöhner 31913 industry locking key. It provides a simple and effective solution for protecting fuse installations against unauthorised access whilst maintaining compliance with IEC fuse standards.
The Wöhner 31912 locking cap is engineered to prevent unauthorised removal or replacement of DIII fuse links while maintaining compliance with IEC 60269 fuse system standards. It is widely used in industrial facilities, commercial installations and OEM electrical equipment where restricted access to fuse holders improves operational safety.
Its precision-engineered construction provides a secure fit on compatible DIII fuse holders without affecting the electrical characteristics of the installation. As the accessory contains no live parts, it delivers reliable, maintenance-free protection throughout its service life.
| Manufacturer | Wöhner |
|---|---|
| Model | 31912 |
| Product type | Locking cap |
| Version | Industry |
| Fuse size | DIII / E33 |
| Rated voltage (AC) | 500 V |
| Rated voltage (DC) | 500 V |
| Power dissipation | 0 W |
| Material | Halogen-free plastic |
| Weight | 2.6 kg/100 pieces |
| Standards | IEC 60269-1, IEC 60269-3 |
| Pack quantity | 10 |
| EAN | 4021267319120 |
| Matching accessory | Wöhner 31913 industry locking key |
It is a DIII industry locking cap that prevents unauthorised removal or replacement of DIII fuse links in compatible E33 fuse holders.
The locking cap is designed for DIII / E33 screw fuse systems.
The Wöhner 31912 is rated for 500 V AC and 500 V DC.
The industry version is designed for use with the Wöhner 31913 industry locking key.
Each pack contains 10 locking caps.
Wöhner fuse accessories are trusted by panel builders, OEM manufacturers and industrial engineers for delivering secure, standards-compliant and reliable protection across low-voltage power distribution systems.
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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...