MERSEN FUSE 400V FA 0,8 A 6.32 P MI6FA40V0.8P

Why Choose the Mersen J078921 High-Speed Miniature Fuse?

The Mersen J078921, also identified by the catalogue number MI6FA40V0.8P, is a compact high-speed semiconductor miniature fuse designed to protect sensitive electronic components against damaging overcurrents and short circuits. It forms part of Mersen’s FA range of miniature fuse-links for industrial electronics, automation equipment and power control systems.

Its high-speed operating characteristic helps interrupt excessive current rapidly, limiting the electrical energy transmitted to semiconductor devices and associated circuitry. This fast response helps reduce thermal stress and the risk of damage in applications where conventional general-purpose fuses may not operate quickly enough.

With a rated current of 0.8 A, a rated voltage of 400 V AC and a compact 6.3 × 32 mm cylindrical format, the J078921 provides dependable protection in space-restricted equipment. The fuse also includes a striker indicator, allowing its operating status to be detected visually or used with compatible signalling accessories.

Key Advantages

• High-speed FA characteristic for semiconductor protection.
• 0.8 A rated current for sensitive electronic circuits.
• 400 V AC voltage rating for industrial equipment.
• Compact 6.3 × 32 mm cylindrical cartridge format.
• Integrated striker assists with fuse-status indication.
• Clip-mounted design allows straightforward installation and replacement.

Key Features

• Mersen FA semiconductor miniature fuse series.
• Catalogue number: MI6FA40V0.8P.
• 0.8 A rated current.
• 400 V AC rated voltage.
• High-speed operating characteristic.
• Integrated striker indicator.
• Ferrule terminals for compatible fuse clips and holders.
• RoHS-compliant construction.

Fast Protection for Sensitive Electronic Components

Semiconductor devices can be damaged rapidly when exposed to excessive current. The Mersen J078921 uses a high-speed fuse element to disconnect the circuit quickly, helping to limit fault energy and reduce the risk of damage to protected components.

Its compact cylindrical cartridge fits compatible fuse clips and holders, allowing straightforward installation within control panels, electronic assemblies and industrial equipment. The integrated striker can provide a clear indication after the fuse has operated, helping maintenance engineers identify faults more efficiently.

Typical Applications

• Semiconductor device protection.
• Industrial control and automation equipment.
• Electronic power supplies and control modules.
• Power conversion and rectifier circuits.
• Instrumentation and measurement equipment.
• Industrial machinery and electronic assemblies.