Why Choose the Mersen Z221259 Protistor® Semiconductor Fuse?
The Mersen Z221259 (BS17UZ69V50P) is a high-speed aR semiconductor protection fuse-link engineered to provide exceptional protection for sensitive power semiconductor devices in demanding industrial applications. Part of the renowned Mersen Protistor® BS88-4 series, this fuse is designed to minimise damage caused by short circuits while ensuring reliable operation of critical equipment.
Manufactured to IEC 60269-1 and IEC 60269-4 standards, the Z221259 offers fast fault interruption with low let-through energy, making it ideal for protecting IGBTs, thyristors, diodes, GTOs and other semiconductor components. Its integrated striker provides visual indication and can operate an optional microswitch for remote fault signalling, helping to reduce maintenance time and improve system monitoring.
With a 50 A current rating, 690 V AC IEC operating voltage and a 200 kA breaking capacity, this compact 17 x 49 mm fuse-link delivers dependable protection for industrial drives, UPS systems, power converters and automation equipment where semiconductor protection is essential.
Key Advantages
- High-speed aR semiconductor protection fuse for sensitive electronic equipment.
- 50 A current rating with 690 V AC IEC operation.
- Integrated striker indication for rapid fault identification.
- 200 kA breaking capacity provides excellent fault protection.
- Low I²t characteristics help minimise semiconductor damage.
- Designed to international IEC and BS88-4 standards for worldwide acceptance.
Key Features
- Mersen Protistor® BS88-4 series.
- Catalogue number: BS17UZ69V50P.
- 50 A rated current.
- 690 V AC IEC / 700 V AC UL rated voltage.
- aR ultra-fast semiconductor protection characteristic.
- Integrated mechanical striker indication.
- 17 x 49 mm British Standard fuse-link.
- Pure silver fuse elements within a ceramic body for superior performance.
Reliable Protection for Power Electronics
Semiconductor protection fuses are specifically designed to interrupt extremely high fault currents before they can damage expensive power electronic devices. Unlike conventional fuses, aR fuse-links respond rapidly to short-circuit conditions while allowing normal inrush currents, making them ideal for industrial drives and power conversion equipment.
The Mersen Protistor® range is trusted worldwide for protecting variable speed drives, UPS systems, renewable energy equipment and industrial automation systems. The Z221259 combines fast response, low energy let-through and dependable fault indication to maximise equipment reliability and reduce downtime.
Typical Applications
- Variable speed drives (VSDs) and VFDs.
- Industrial motor control systems.
- Power converters and inverters.
- UPS and backup power equipment.
- Renewable energy power electronics.
- Protection of IGBTs, thyristors, diodes and semiconductor assemblies.
