Mersen H331138 UltraSafe US142I two-pole modular fuse holder for 14 × 51 mm cylindrical fuse-links, rated at 50 A, 800 V AC and 1000 V DC, with visual indication and IP20 protection.
£58.86
The Mersen H331138, also identified as the US142I, is a high-performance two-pole modular fuse holder designed for reliable protection of industrial power circuits, machinery and semiconductor equipment. Part of the advanced Mersen UltraSafe™ US14 range, it accepts standard 14 × 51 mm cylindrical fuse-links and combines compact installation with dependable electrical safety.
This model includes an integrated visual blown-fuse indicator, allowing maintenance personnel to identify an operated fuse quickly without extensive circuit testing. Its pressure-plate terminals provide secure conductor connections, while the finger-safe IP20 housing helps protect installers and operators during normal use and fuse replacement.
Rated at 50 A, up to 800 V AC and 1000 V DC, the H331138 is particularly suited to demanding applications such as variable speed drives, inverters, uninterruptible power supplies and industrial control systems. Its DIN rail mounting format enables straightforward installation in electrical panels and machine enclosures.
The Mersen H331138 securely accommodates two 14 × 51 mm cylindrical fuse-links to protect electrical equipment against overload and short-circuit conditions. Its high AC and DC voltage capabilities make it particularly suitable for modern power-conversion equipment and industrial systems operating at elevated voltages.
The visual blown-fuse indicator allows engineers to locate an operated fuse quickly, helping reduce diagnostic time and equipment downtime. Its robust pressure-plate connections and finger-safe construction also support secure, efficient maintenance in demanding industrial environments.
| Manufacturer | Mersen |
|---|---|
| Series | UltraSafe™ US14 |
| Model | US142I |
| Manufacturer part number | H331138 |
| Product type | Modular cylindrical fuse holder |
| Fuse size | 14 × 51 mm |
| Number of poles | 2 |
| Rated current | 50 A |
| Maximum rated voltage AC | 800 V |
| Maximum rated voltage DC | 1000 V |
| Fuse indication | Visual blown-fuse indicator |
| Terminal type | Pressure plate |
| Conductor range | Approximately 14 to 2 AWG |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Housing material | Flame-retardant thermoplastic |
| Operating temperature | Approximately -25°C to +60°C |
| Dimensions (H × W × D) | Approximately 107 × 53 × 94 mm |
| Electrical supply type | AC / DC |
| HS Code | 85361050 |
| Country of Manufacture | Tunisia |
The H331138 is designed for standard 14 × 51 mm cylindrical fuse-links.
The fuse holder has a two-pole configuration, allowing two fuse-links to be installed within one modular assembly.
Yes. The Mersen H331138 includes an integrated visual blown-fuse indicator to support rapid fault identification.
The H331138 is rated at 50 A and is suitable for systems up to 800 V AC or 1000 V DC.
It is typically mounted on a standard DIN rail inside industrial control panels, drive cabinets, inverter systems and power-distribution enclosures.
Mersen UltraSafe™ fuse holders are widely specified by panel builders, machine manufacturers and power-electronics engineers for dependable circuit protection, finger-safe operation and efficient fuse maintenance.
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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...