Why Choose the Mersen J222487 Microswitch for NH2 Fuse Bases?
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.
Key Advantages
- Provides remote fuse-status indication.
- Designed for compatible single-pole NH size 2 fuse bases.
- Operates with suitable NH fuse-links incorporating a striker.
- Can indicate when the fuse-link has operated or is absent.
- 250 V AC, 10 A switch rating.
- Supports integration with alarms, indicators and automation systems.
- Helps reduce fault-finding and maintenance time.
Key Features
- Mersen MSBB21 microswitch.
- Manufacturer item number J222487.
- Compatible with selected Mersen NH2 fuse bases.
- Intended for single-pole fuse-base configurations.
- Suitable for striker-operated NH fuse-links.
- Rated switching voltage of 250 V AC.
- Rated switching current of 10 A.
- 6.3 × 0.8 mm connection terminals.
- Suitable for remote indication and monitoring circuits.
Reliable Fuse-Status Monitoring for NH Systems
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.
Typical Applications
- Industrial low-voltage switchboards.
- NH2 fuse-base assemblies.
- Power-distribution panels.
- Motor control centres.
- Industrial machinery panels.
- PLC-based fuse monitoring systems.
- Remote alarm and indication circuits.
- OEM electrical-panel construction.
