Why Choose the Mersen P097257 High-Speed Semiconductor Fuse?
The Mersen P097257 is an ultra-rapid Protistor® high-speed semiconductor fuse-link engineered to protect sensitive power electronic components against damaging fault currents. Also identified as BS36UL69V180T, it provides effective current limitation and a high interrupting capacity for demanding industrial power conversion equipment.
Featuring an aR partial-range operating class, the P097257 is specifically designed for semiconductor short-circuit protection. Its rapid operating characteristics help restrict peak fault current and let-through energy, reducing electrical, thermal and mechanical stress on diodes, thyristors, rectifiers, IGBTs and associated circuit components.
With a rated current of 180 A and a rated voltage of 690 V AC, the Mersen P097257 is suitable for variable frequency drives, industrial converters, rectifiers, inverters and uninterruptible power supplies. Its 36 × 55 mm British Standard body, bolted L-bracket terminals and integrated striker provide secure installation and convenient fuse-operation indication.
Key Advantages
- Ultra-rapid semiconductor fuse for industrial power electronics.
- 180 A rated current for medium- and high-power equipment.
- 690 V AC rating for demanding industrial installations.
- aR operating class provides dedicated semiconductor short-circuit protection.
- High current-limiting performance helps minimise component damage.
- Integrated striker supports visual or remote fuse-operation signalling.
Key Features
- Mersen Protistor® URGL high-speed fuse range.
- 180 A nominal current rating.
- 690 V AC rated voltage.
- aR partial-range semiconductor protection characteristic.
- High breaking capacity of up to 200 kA AC.
- Compact 36 × 55 mm fuse-link body.
- Bolted L-bracket terminal configuration.
- Integrated striker indication mechanism.
Ultra-Rapid Protection for Power Electronics
The Mersen P097257 is designed to interrupt dangerous short-circuit currents before excessive energy can reach sensitive semiconductor devices. Its current-limiting performance reduces peak fault current and total let-through energy, helping protect valuable power modules and minimise secondary damage within industrial equipment.
The fuse element is engineered for rapid response to high fault currents while maintaining dependable operation under normal circuit conditions. This makes the P097257 particularly suitable for equipment in which conventional industrial fuses may not operate quickly enough to protect semiconductor junctions.
Typical Applications
- Variable frequency drives and industrial motor controllers.
- AC and DC industrial power converters.
- Rectifier bridges and thyristor assemblies.
- Industrial inverters and power conversion systems.
- Uninterruptible power supply equipment.
- Battery chargers and regulated power supplies.
- Semiconductor-controlled machinery and automation systems.
Secure Installation and Fuse-Status Indication
The P097257 uses bolted L-bracket terminals to provide a secure electrical and mechanical connection within compatible fuse assemblies. This robust mounting arrangement is well suited to industrial installations exposed to high currents, vibration and repeated operating cycles.
An integrated striker provides a clear indication when the fuse has operated. The striker may also actuate a compatible microswitch, allowing the fuse status to be incorporated into an alarm, monitoring or control circuit for faster fault identification.
Correct Fuse Selection
As an aR-class fuse-link, the Mersen P097257 provides partial-range protection specifically against semiconductor short-circuit currents. Suitable supplementary overload protection should therefore be incorporated where protection against sustained overload conditions is also required.
Before installation, confirm that the circuit voltage, operating current, prospective fault current, fuse dimensions, mounting arrangement and semiconductor withstand values are compatible with the P097257. Always follow the equipment manufacturer's fuse-selection requirements.
