Mersen USMSW4 auxiliary microswitch kit with two switches for compatible UltraSafe US22 22 x 58 mm fuse holders, providing remote fuse-holder status indication.
£14.95
The Mersen USMSW4, manufacturer reference G227959, is an auxiliary microswitch kit developed for compatible Mersen UltraSafe US22 modular fuse holders. It enables remote electrical indication of fuse-holder status, helping control systems and maintenance personnel identify whether a fuse carrier is closed, opened or associated with an operated fuse.
The kit includes two auxiliary microswitches for installation on one suitably prepared US22 fuse-holder pole. These contacts can be connected to PLC inputs, alarm circuits, indicator lamps or supervisory systems, allowing fuse-holder operation to be monitored without requiring direct visual inspection inside the electrical panel.
Designed for compatible 22 × 58 mm UltraSafe fuse holders, the USMSW4 uses Faston-type connections for straightforward control wiring. Its compact format supports efficient integration into industrial switchboards, machinery panels, power conversion equipment and other installations where remote fuse-status monitoring can reduce troubleshooting time and improve system availability.
The Mersen USMSW4 converts the mechanical status of a compatible UltraSafe fuse holder into electrical signals that can be used by an external monitoring or control system. This enables alarms, PLC logic or indicator circuits to respond when the fuse carrier is opened or when a monitored operating condition changes.
Remote indication is particularly valuable in continuously operated machinery and distributed electrical systems, where fast identification of an affected circuit can reduce diagnostic time. The USMSW4 also helps panel builders create more informative control systems without substantially increasing the footprint of the fuse-holder assembly.
| Manufacturer | Mersen |
|---|---|
| Series | UltraSafe US22 accessories |
| Catalogue number | USMSW4 |
| Manufacturer reference | G227959 |
| Product type | Auxiliary microswitch kit |
| Accessory function | Remote fuse-holder status indication |
| Number of microswitches | 2 |
| Application | One compatible US22 fuse-holder pole |
| Compatible fuse-holder size | 22 × 58 mm |
| Connection type | Faston lugs |
| Rated insulation voltage | 250 V AC |
| Maximum switching current | 5 A |
| Installation requirement | Prepared compatible fuse disconnector |
| Approximate weight | 20 g |
| Package quantity | 1 kit |
The Mersen USMSW4 provides auxiliary electrical contacts for remotely monitoring the status of a compatible Mersen UltraSafe US22 fuse holder.
The USMSW4 kit includes two auxiliary microswitches for one suitably prepared fuse-holder pole.
The kit is designed for compatible, previously prepared Mersen UltraSafe US22 fuse holders for 22 × 58 mm fuse-links.
The auxiliary microswitches use Faston lug connections for integration into low-current control, alarm or PLC input circuits.
No. It must be installed on a compatible Mersen fuse disconnector that has been prepared to accept the auxiliary microswitch kit.
Mersen UltraSafe accessories are used by panel builders, automation engineers and industrial maintenance teams to provide dependable remote indication, faster fault diagnosis and effective integration with modern electrical control systems.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...