Why Choose the Mersen A090551 Time-Delay Glass Cartridge Fuse?
The Mersen A090551, catalogue reference MI5ST25V6.3, is a compact and dependable time-delay miniature cartridge fuse designed to protect electrical distribution circuits, industrial equipment and control systems against overloads and short circuits. As part of the Mersen 5ST IEC miniature fuse series, it withstands brief starting and inrush currents while responding to sustained overcurrent conditions.
Rated at 6.3 A and 250 V AC, the A090551 is particularly suitable for circuits containing motors, transformers, power supplies and other inductive loads. Its time-delay characteristic helps prevent unnecessary fuse operation during normal start-up conditions, while still providing dependable protection against prolonged overloads.
The fuse features a standard 5 × 20 mm glass body with nickel-plated brass contact caps, allowing easy installation in compatible clips, fuse holders and equipment-mounted carriers. Its transparent construction also enables straightforward visual inspection of the fuse element during maintenance and fault diagnosis.
Key Advantages
- Compact 5 × 20 mm time-delay cartridge fuse.
- 6.3 A rated current for industrial and electrical circuits.
- 250 V AC voltage rating.
- Time-delay operation withstands temporary starting and inrush currents.
- 35 A AC breaking capacity.
- Transparent glass body allows visual fuse-element inspection.
- Standard cylindrical format simplifies replacement.
- Suitable for motors, transformers and industrial control equipment.
Key Features
- Mersen 5ST IEC miniature fuse series.
- 6.3 A rated current.
- 250 V AC rated voltage.
- Time-delay fuse characteristic.
- 35 A maximum AC breaking capacity.
- Standard 5 × 20 mm cylindrical fuse format.
- Glass body without an extinguishing agent.
- Nickel-plated brass contact caps.
- Clip or fuse-holder mounting.
- Designed for circuits with temporary current surges.
Dependable Protection for Circuits with Inrush Current
Time-delay fuses such as the Mersen A090551 are designed to tolerate temporary current surges that occur when motors, transformers and power supplies are energised. This helps prevent nuisance fuse operation during normal equipment start-up while maintaining protection against sustained overloads and short-circuit faults.
The A090551 should be selected according to the normal operating current, supply voltage, expected inrush current and prospective fault current of the circuit. Its 5 × 20 mm construction makes it suitable for a wide range of standard industrial and electronic fuse holders.
Typical Applications
- Small motors and motor-control circuits.
- Transformer primary and secondary circuits.
- Industrial control panels.
- Power supplies and power conversion equipment.
- Automation and process-control systems.
- Electrical distribution and OEM equipment.
