Why Choose the Mersen D331157 UltraSafe US141N Fuse Holder?
The Mersen D331157, catalogue reference US141N, is a compact single-pole plus neutral modular fuse holder designed for safe and dependable overcurrent protection in industrial electrical systems. As part of the Mersen UltraSafe™ US14 series, it accommodates 14 × 51 mm IEC cylindrical fuse-links and is engineered for demanding industrial control panels, machinery, low-voltage distribution and renewable energy applications.
Rated for fuse-links up to 50 A, the US141N is suitable for systems operating at up to 800 V AC and 1000 V DC (UL) or 750 V AC/DC (IEC). The integrated neutral pole provides convenient neutral isolation alongside phase protection, making it ideal for single-phase installations requiring a switched neutral conductor.
The UltraSafe™ design incorporates a finger-safe IP20 enclosure, flame-retardant materials and DIN rail mounting for quick installation and maintenance. The holder is lockable and sealable in both the open and closed positions, providing additional safety during servicing.
Key Advantages
- Single-pole plus neutral 14 × 51 mm modular fuse holder.
- 50 A maximum fuse rating.
- Suitable for systems up to 800 V AC and 1000 V DC (UL).
- 750 V AC/DC IEC rating.
- Finger-safe IP20 construction.
- Integrated neutral isolation.
- DIN rail mounting for rapid installation.
- Lockable and sealable for improved maintenance safety.
Key Features
- Mersen UltraSafe™ US14 series.
- Catalogue number: US141N.
- Manufacturer item number: D331157.
- Single-pole plus neutral configuration.
- Designed for 14 × 51 mm IEC cylindrical fuse-links.
- 50 A maximum fuse rating.
- 800 V AC / 1000 V DC UL rating.
- 750 V AC / DC IEC rating.
- Finger-safe IP20 enclosure.
- DIN rail mounting.
- No visual indicator or microswitch.
- Flame-retardant UL94 V-0 thermoplastic housing.
Reliable Protection with Neutral Isolation
The UltraSafe™ US141N combines dependable overcurrent protection with integrated neutral isolation, allowing installers to safely isolate both the phase and neutral conductors during maintenance. This configuration is particularly beneficial for industrial machinery, control circuits and power distribution applications where complete circuit isolation is required.
Its compact modular construction, finger-safe enclosure and DIN rail mounting make the US141N easy to install while providing long-term reliability in demanding industrial environments.
Typical Applications
- Industrial control panels.
- Single-phase machinery protection.
- Transformer protection.
- Low-voltage distribution systems.
- Renewable energy installations.
- OEM machinery.
- Automation equipment.
- Industrial switchboards.
