Why Choose the Mersen J210343 5HF Fast-Acting Miniature Fuse?
The Mersen J210343 is a high-performance fast-acting miniature cartridge fuse designed to provide rapid overcurrent and short-circuit protection for industrial electrical distribution circuits and electronic equipment. Identified by the catalogue reference MI5HF25V20, it forms part of the proven Mersen 5HF IEC miniature fuse series.
With a rated current of 20 A and a rated voltage of 250 V AC, the J210343 delivers dependable circuit protection where fast fault interruption is essential. Its quick-acting characteristic helps minimise damage to equipment by disconnecting fault currents rapidly before excessive heat can build up.
Manufactured with a durable 5 × 20 mm ceramic cartridge body, the fuse offers a high 1,500 A breaking capacity, making it suitable for demanding industrial control systems, power supplies, instrumentation and OEM electrical equipment.
Key Advantages
- Fast-acting fuse for rapid overcurrent protection.
- 20 A current rating for higher current industrial circuits.
- 250 V AC voltage rating.
- Standard 5 × 20 mm miniature fuse format.
- 1,500 A breaking capacity for reliable fault interruption.
- Ceramic construction provides excellent thermal and electrical performance.
- Compatible with standard 5 × 20 mm fuse holders.
Key Features
- Mersen 5HF IEC miniature fuse series.
- MI5HF25V20 catalogue reference.
- 20 A rated current.
- 250 V AC rated voltage.
- Fast-acting characteristic.
- 1,500 A AC breaking capacity.
- Ceramic cartridge construction.
- Nickel-plated brass end caps.
- Designed for industrial and electronic protection applications.
- RoHS compliant.
Reliable Protection for Industrial Electrical Equipment
Fast-acting miniature fuses are designed to disconnect fault currents immediately, helping protect sensitive electrical equipment from overloads and short circuits. Their rapid response helps reduce thermal stress and limits potential damage to connected components.
The Mersen 5HF range is widely used in industrial control panels, automation equipment, instrumentation and electronic assemblies where dependable, repeatable protection is required throughout the life of the installation.
Typical Applications
- Industrial control panels.
- Electrical distribution circuits.
- Power supplies.
- Instrumentation equipment.
- Electronic control systems.
- OEM machinery and automation equipment.
