Why Choose the Mersen BB31PPMS NH3 Fuse Base?
The Mersen BB31PPMS is a robust single-pole NH3 fuse base with an integrated microswitch, designed for dependable fuse mounting and circuit protection in high-current industrial electrical systems. Also identified by the Mersen item number H218760, this fuse base supports NH size 3 fuse-links and provides rated operation at up to 1250 V AC, 1000 V DC and 630 A.
Part of the Mersen NH plastic fuse-base range, the BB31PPMS combines a durable moulded base with stable silver-plated electrolytic copper contact springs. Separate captive steel springs maintain reliable contact pressure, helping the assembly withstand the thermal and electrical stresses encountered in switchboards, distribution equipment and industrial control panels.
The integrated microswitch enables fuse-status monitoring when the base is used with a compatible NH fuse-link incorporating a striker. The microswitch can operate when the fuse-link melts or when no fuse-link is installed, allowing the condition to be communicated to an alarm, PLC or supervisory control system.
Key Advantages
- Heavy-duty NH3 fuse base rated at 630 A.
- Suitable for systems operating at up to 1250 V AC or 1000 V DC.
- Integrated microswitch for fuse-status indication.
- Compatible with NH fuse-links equipped with a striker mechanism.
- Flexible installation by screw mounting or DIN rail mounting.
- Silver-plated copper contacts provide reliable electrical conductivity.
- Single-pole modular design allows multiple bases to be mounted in parallel.
Key Features
- Mersen NH plastic fuse-base series.
- NH size 3 fuse-link compatibility.
- Single-pole configuration.
- 630 A rated current.
- 1250 V AC IEC rated voltage.
- 1000 V DC IEC rated voltage.
- Integrated microswitch rated at up to 250 V AC, 10 A.
- Screw-terminal electrical connections.
- Screw mounting or DIN rail mounting options.
- RoHS-compliant construction.
Reliable NH Fuse Protection and Status Monitoring
NH fuse systems are widely used to protect high-current electrical circuits against overloads and short circuits. The Mersen BB31PPMS securely supports an NH3 fuse-link while providing the contact pressure and conductivity required for reliable operation in industrial power-distribution applications.
When fitted with a compatible striker-operated fuse-link, the integrated microswitch provides a remote indication of fuse operation or absence. This functionality supports faster fault identification and can reduce maintenance time by allowing fuse status to be monitored from a control panel, PLC or building-management system.
Typical Applications
- Industrial low-voltage distribution boards.
- Electrical switchboards and switchgear assemblies.
- Motor control centres and machinery panels.
- High-current feeder and branch-circuit protection.
- Renewable-energy and DC distribution systems.
- Automation systems requiring remote fuse-status monitoring.
- Power-distribution equipment and OEM panel building.
