Why Choose the Mersen CMS143NI Modulostar® Fuse Holder?
The Mersen CMS143NI, manufacturer reference Q331007, is a robust three-pole plus neutral modular fuse holder designed for 14 × 51 mm cylindrical fuse links. Part of the established Mersen Modulostar® CMS14 series, it provides dependable circuit protection and isolation for three-phase electrical distribution, industrial machinery and control-panel applications.
This IEC fuse holder includes an integrated visual blown-fuse indicator, allowing maintenance engineers to identify an operated fuse quickly and reduce troubleshooting time. Its finger-safe IP20 construction helps protect against accidental contact with live components, including during fuse replacement when installed and used correctly.
Rated for operation at up to 690 V AC and 690 V DC with an ampere rating of 50 A, the CMS143NI is suitable for protecting motors, transformers, drives, control circuits and low-voltage distribution equipment. Its modular DIN rail format supports straightforward integration into industrial switchboards and electrical enclosures.
Key Advantages
- Combined three-pole plus neutral configuration for three-phase installations.
- Designed for standard 14 × 51 mm cylindrical fuse links.
- Visual blown-fuse indication supports faster fault identification.
- Rated for electrical systems up to 690 V AC and 690 V DC.
- 50 A ampere rating for industrial circuit protection.
- Finger-safe IP20 protection, including during fuse changing.
- Modular DIN rail mounting simplifies panel installation.
- Durable thermoplastic construction for demanding environments.
Key Features
- Mersen Modulostar® CMS14 series.
- Three poles plus neutral configuration.
- Compatible with 14 × 51 mm fuse links.
- 50 A rated current.
- 690 V AC IEC rated voltage.
- 690 V DC IEC rated voltage.
- Integrated visual fuse-status indicator.
- Finger-safe IP20 design.
- DIN rail mounting to EN 60715.
- Suitable for gG, aM and compatible Mersen fuse links.
Reliable Three-Phase Circuit Protection and Isolation
The Mersen CMS143NI securely accommodates cylindrical fuse links that protect electrical circuits against overload and short-circuit conditions. Its three-pole plus neutral arrangement makes it particularly suitable for three-phase installations where coordinated conductor isolation is required within a compact modular assembly.
The integrated visual indicator helps engineers locate operated fuse links during inspection, while the IP20 finger-safe design supports safer maintenance. These features make the CMS143NI a practical choice for panel builders, machine manufacturers and electrical engineers working with industrial power systems.
Typical Applications
- Three-phase industrial distribution systems.
- Motor and motor-control circuits.
- Transformer protection.
- Variable-speed drive protection.
- Industrial control panels.
- Electrical switchboards.
- OEM machinery and automation equipment.
- Low-voltage power distribution.
