Why Choose the Mersen B223515 US27IRING UltraSafe™ Fuse Holder?
The Mersen B223515, catalogue number US27IRING, is a single-pole UltraSafe™ modular fuse holder designed for cylindrical 27 × 60 mm fuse links. Rated for operation at up to 800 V AC and 800 V DC, it provides a robust and finger-safe solution for industrial power distribution, semiconductor protection and power-conversion installations.
Part of the Mersen Modulostar® CMS27 and UltraSafe™ US27 range, the B223515 features an integrated visual fuse-operation indicator, allowing maintenance personnel to identify an operated fuse quickly. Its ring-lug terminal arrangement supports secure cable termination, while the IP20 construction helps protect operators against accidental contact with live parts, including during fuse replacement.
The US27IRING has a conventional free-air thermal current rating of 140 A and accommodates fuse links with a maximum power dissipation of 11 W. DIN rail mounting in accordance with EN 60715 makes it suitable for installation in industrial control panels, drives, converters, UPS systems and renewable-energy equipment.
Key Advantages
- Suitable for 27 × 60 mm cylindrical fuse links.
- 800 V AC and 800 V DC IEC and UL voltage ratings.
- 140 A thermal current rating.
- Integrated visual blown-fuse indicator.
- IP20 finger-safe construction, including during fuse replacement.
- Secure ring-lug terminal connections.
- DIN rail mounting for efficient panel installation.
- Modular single-pole design suitable for field-assembled systems.
Key Features
- Mersen Modulostar® UltraSafe™ fuse holder.
- Item number: B223515.
- Catalogue number: US27IRING.
- Single-pole configuration.
- Compatible with 27 × 60 mm ferrule fuse links.
- 800 V AC/DC rated voltage.
- Visual fuse-operation indication.
- Ring-lug terminal connection.
- 8 kV rated impulse withstand voltage.
- Durable thermoplastic or thermoset construction.
- RoHS-compliant design.
Finger-Safe Industrial Fuse Installation
The Mersen B223515 is designed to provide IP20 finger-safe protection during normal operation and fuse replacement. Its enclosed modular construction helps reduce the risk of accidental contact with energised components, improving safety for operators and maintenance personnel working within industrial electrical panels.
The fuse holder can be mounted directly onto a standard DIN rail and incorporated into modular protection assemblies. Its durable housing is engineered to withstand demanding industrial environments while providing dependable retention and electrical contact for compatible 27 × 60 mm fuse links.
Integrated Visual Fuse Indicator
The US27IRING incorporates a visual indication system that identifies when a compatible fuse has operated. This allows maintenance personnel to locate a faulted circuit quickly without testing every fuse individually, helping to reduce diagnostic time and equipment downtime.
The visual indicator is particularly useful in control panels and power-conversion systems containing multiple protected circuits. Compatible microswitch accessories may also be used within the wider UltraSafe™ range where remote electrical indication is required.
Typical Applications
- Industrial control panels.
- Variable-frequency drives.
- Power converters and rectifiers.
- UPS and backup-power systems.
- Renewable-energy inverters.
- Semiconductor protection circuits.
- Motor-control centres.
- Industrial power-distribution systems.
- Equipment operating at up to 800 V AC or DC.
