Mersen J222487 MSBB21 microswitch accessory for compatible single-pole NH2 fuse bases, rated at 250 V AC and 10 A for remote fuse-status indication.
£35.43
The Mersen J222487, also identified as MSBB21, is a dedicated microswitch accessory for compatible single-pole NH size 2 fuse bases. It is designed to provide remote fuse-status indication when used with an appropriate NH fuse-link equipped with a striker mechanism.
When the installed fuse-link operates, its striker actuates the microswitch, allowing the change in fuse status to be communicated to an alarm circuit, indicator, PLC or supervisory control system. The switch can also indicate when no compatible fuse-link is installed, helping engineers identify an open or incomplete fuse circuit more quickly.
Rated at up to 250 V AC and 10 A, the J222487 provides a practical method of adding electrical monitoring to compatible Mersen NH2 fuse-base installations. Its compact format and standard 6.3 × 0.8 mm terminals support straightforward integration within industrial switchboards and power-distribution panels.
Fuse-status monitoring allows maintenance personnel and control systems to identify an operated fuse without inspecting every fuse-link individually. When a compatible striker-equipped NH fuse-link operates, the striker mechanically changes the state of the Mersen J222487 microswitch.
The resulting electrical signal can be connected to a warning lamp, audible alarm, PLC input or remote monitoring system. This helps minimise equipment downtime and supports faster diagnosis of faults in industrial power-distribution equipment.
| Manufacturer | Mersen |
|---|---|
| Manufacturer item number | J222487 |
| Model | MSBB21 |
| Product type | Fuse-base microswitch |
| Compatible fuse size | NH2 |
| Compatible configuration | Single-pole fuse base |
| Compatible fuse-link type | NH fuse-link with striker |
| Function | Remote fuse-status indication |
| Operating condition | Fuse-link operated or absent |
| Rated voltage | 250 V AC |
| Rated current | 10 A |
| Terminal dimensions | 6.3 × 0.8 mm |
| Installation type | Accessory mounting on a compatible fuse base |
| Application | Monitoring and signalling circuits |
The J222487 is a microswitch used to provide remote status indication from a compatible single-pole NH size 2 fuse base.
The Mersen J222487 is also identified by the model or catalogue reference MSBB21.
A compatible NH fuse-link contains a striker that actuates the microswitch when the fuse-link operates. The switch can then send a signal to an alarm, indicator or control system.
The J222487 microswitch is rated at up to 250 V AC and 10 A.
No. It is intended for compatible single-pole NH size 2 fuse bases and should be used with an appropriate striker-equipped NH fuse-link.
Mersen fuse-base microswitches are used by panel builders, maintenance engineers and industrial equipment manufacturers to provide dependable fuse-status signalling and faster identification of electrical faults.
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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...