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.
MERSEN FUSE US141I US141I
Mersen A331154 UltraSafe US141I single-pole DIN rail fuse holder with visual blown fuse indicator for 14 x 51 mm cylindrical fuse links, rated 50 A and 750 V AC/DC.
£17.15
Why Choose the Mersen A331154 UltraSafe™ US141I Fuse Holder?
The Mersen A331154, catalogue number US141I, is a premium single-pole DIN rail fuse holder designed for 14 × 51 mm cylindrical fuse links. Part of the Mersen UltraSafe™ US14 series, it features an integrated visual blown fuse indicator, allowing maintenance personnel to identify an operated fuse quickly and safely.
Rated at 50 A and up to 750 V AC/DC under UL standards, the US141I combines high-performance circuit protection with industry-leading safety. Its IP20 finger-safe construction protects against accidental contact with live components, including during fuse replacement, making it ideal for industrial control panels, machinery and power distribution systems.
Designed for installation on a standard 35 mm DIN rail, the US141I incorporates pressure-plate terminals, a compact footprint and lockable operation. It is suitable for protecting motor drives, UPS systems, transformers, industrial machinery and other critical electrical equipment requiring dependable overcurrent protection.
Key Advantages
- Single-pole UltraSafe™ fuse holder for 14 × 51 mm cylindrical fuse links.
- Integrated visual blown fuse indicator for rapid fault identification.
- 50 A current rating for industrial applications.
- Rated up to 750 V AC/DC under UL standards.
- IP20 finger-safe protection during operation and fuse replacement.
- Compact DIN rail design saves panel space.
- Lockable and sealable in both open and closed positions.
- Compatible with optional auxiliary microswitch accessories.
Key Features
- Mersen UltraSafe™ US14 series.
- Catalogue number: US141I.
- Manufacturer item number: A331154.
- Single-pole modular fuse holder.
- Compatible with 14 × 51 mm cylindrical fuse links.
- Visual blown fuse indicator.
- 50 A rated current.
- 750 V AC/DC UL rating.
- Pressure-plate screw terminals.
- DIN rail mounting with IP20 protection.
Safe and Reliable Protection for Industrial Electrical Systems
The UltraSafe™ US141I securely houses 14 × 51 mm cylindrical fuse links while providing effective overcurrent and short-circuit protection. The integrated visual indicator allows maintenance engineers to identify blown fuses rapidly, reducing troubleshooting time and improving equipment availability.
Its compact modular design, finger-safe construction and optional remote indication accessories make the US141I an excellent choice for modern industrial control panels, OEM machinery and commercial electrical installations requiring reliable fuse protection.
Typical Applications
- Industrial control panels.
- Motor drives and variable speed drives.
- UPS systems.
- Transformer protection.
- Machinery and automation equipment.
- Power distribution systems.
- OEM electrical panel building.
Technical Specifications
Tick the specs you need, then view products that match.
| Fuse Indication | Visual indicator | |
|---|---|---|
| Phase | Single Phase | |
| Poles | 1-pole | |
| Device Type | Fuse base / holder | |
| Fuse Type | Cylindrical | |
| Fuse Size | 14x51 mm | |
| Current | 50 A | |
| Voltage | 750 V | |
| Manufacturer | Mersen | |
| Series | UltraSafe™ US14 | |
| Catalogue number | US141I | |
| Manufacturer item number | A331154 | |
| Product type | Modular cylindrical fuse holder | |
| Number of poles | 1 | |
| Compatible fuse size | 14 × 51 mm | |
| Rated current | 50 A | |
| Rated voltage | 750 V AC/DC (UL) | |
| Connection type | Pressure plate screw terminal | |
| Wire size | 14 to 2 AWG copper | |
| Protection rating | IP20 | |
| Mounting type | 35 mm DIN rail | |
| Dimensions (H × W × D) | Approx. 107 × 26.5 × 94 mm | |
| Operating temperature | -25°C to +60°C | |
| Housing material | Flame-retardant thermoplastic | |
| UPC | 782001310967 | |
| HS Code | 85361050 | |
| Country of Manufacture | Tunisia |
Frequently Asked Questions
What is the Mersen A331154 used for?
The A331154 (US141I) is a single-pole DIN rail fuse holder for 14 × 51 mm cylindrical fuse links used to protect industrial electrical circuits from overloads and short circuits.
Does the US141I include a blown fuse indicator?
Yes. The US141I features an integrated visual blown fuse indicator to help maintenance personnel quickly identify an operated fuse.
What fuse size is compatible with the US141I?
The fuse holder is designed for 14 × 51 mm cylindrical fuse links.
What is the current and voltage rating?
The US141I is rated for 50 A and up to 750 V AC/DC under UL ratings.
Can the fuse holder be locked?
Yes. The UltraSafe™ US141I can be locked and sealed in both the open and closed positions to improve maintenance safety and lockout procedures.
Trusted Industrial Fuse Protection
Mersen UltraSafe™ fuse holders are trusted worldwide by electrical engineers, machine builders and panel manufacturers for delivering dependable circuit protection, enhanced operator safety and simplified maintenance.
