MERSEN FUSE BASE MOD. CMS.14 3P+N C/I CMS143NI

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.