Why Choose the Mersen C331156 US141MI UltraSafe Fuse Holder?
The Mersen C331156, catalogue reference US141MI, is a compact, single-pole modular cylindrical fuse holder designed for reliable overcurrent protection in demanding industrial electrical systems. Part of the Mersen UltraSafe US14 series, it accepts 14 × 51 mm cylindrical fuse-links and combines high voltage capability with finger-safe construction.
The C331156 is rated for currents up to 50 A and supports operating voltages up to 800 V AC or 1000 V DC under UL ratings. It is also rated at up to 750 V AC or DC under IEC specifications, making it suitable for a broad range of industrial, renewable-energy, semiconductor and power-conversion applications.
This model incorporates both a visual fuse-status indicator and a microswitch. The visual indicator assists with local fault identification, while the microswitch enables remote signalling to a PLC, alarm circuit or monitoring system. Its DIN rail mounting, pressure-plate terminals and IP20 housing support safe, efficient installation inside control panels and electrical cabinets.
Key Advantages
- Compact single-pole fuse holder for 14 × 51 mm cylindrical fuse-links.
- Supports currents up to 50 A.
- High voltage capability of up to 800 V AC and 1000 V DC under UL ratings.
- Integrated visual indicator and microswitch for local and remote fuse-status monitoring.
- Finger-safe IP20 construction, including during fuse replacement.
- 100 kA short-circuit current rating when used with a suitable fuse-link.
- DIN rail mounting simplifies control-panel installation.
- Durable polyamide housing for demanding industrial environments.
Key Features
- Mersen UltraSafe US14 modular fuse holder series.
- US141MI catalogue reference.
- Single-pole modular configuration.
- Designed for 14 × 51 mm cylindrical fuse-links.
- 50 A maximum fuse rating.
- 800 V AC and 1000 V DC UL voltage ratings.
- 750 V AC and DC IEC voltage ratings.
- Combined visual fuse indicator and auxiliary microswitch.
- Remote signalling capability for alarms and automation systems.
- Pressure-plate terminal arrangement.
- Finger-safe housing with an IP20 protection rating.
- DIN rail mounting in accordance with EN 60715.
- RoHS-compliant construction.
Reliable Protection with Local and Remote Monitoring
When fitted with an appropriately selected 14 × 51 mm fuse-link, the Mersen C331156 provides dependable protection against excessive current and short-circuit faults. Its high voltage ratings make it suitable for applications where conventional lower-voltage fuse holders may not provide adequate system capability.
The combined visual indicator and microswitch provide enhanced maintenance support. Engineers can identify fuse operation directly at the panel while also transmitting a status signal to remote monitoring equipment, helping reduce fault-finding time and improve equipment availability.
Typical Applications
- Industrial machinery and automation panels.
- Semiconductor protection systems.
- Solar and renewable-energy equipment.
- Battery and DC power distribution systems.
- Variable speed drive and power-conversion panels.
- Motor and transformer protection circuits.
- Low-voltage switchboards and distribution assemblies.
- OEM equipment and machine-building applications.
