Why Choose the Mersen X221257 BS17UZ69V40P Semiconductor Fuse?
The Mersen X221257, catalogue number BS17UZ69V40P, is a high-speed Protistor® BS88-4 semiconductor fuse-link engineered to provide superior protection for sensitive power semiconductor devices. Featuring an ultra-fast aR operating characteristic, it rapidly clears short-circuit faults to safeguard IGBTs, thyristors, diodes, GTOs and other power semiconductor devices used in demanding industrial applications.
Rated at 40 A with 690 V AC (IEC) and 700 V AC (UL) ratings, the BS17UZ69V40P is ideal for variable speed drives, UPS systems, small inverters, rectifiers and industrial power converters. Its integrated striker indicator enables fast visual identification of an operated fuse and can operate a compatible microswitch for remote indication.
Manufactured using Mersen's proven Protistor® technology with pure silver elements embedded in solidified sand, the fuse delivers excellent current limitation, low let-through energy and a high interrupting capacity to minimise damage to expensive semiconductor equipment.
Key Advantages
- Ultra-fast aR semiconductor protection.
- 40 A current rating.
- 690 V AC IEC / 700 V AC UL ratings.
- Integrated striker indicator for local or remote signalling.
- 200 kA AC breaking capacity.
- Excellent current limitation with low I²t.
- Compact BS88-4 17 × 49 mm construction.
- Suitable for demanding industrial power electronic applications.
Key Features
- Manufacturer: Mersen
- Series: Protistor® BS88-4 17 × 49 aR URZ/URY
- Manufacturer SKU: X221257
- Catalogue number: BS17UZ69V40P
- Fuse class: aR
- 17 × 49 mm British Standard fuse-link.
- Integrated striker indicator.
- Bolted copper L-bracket terminals.
- UL Recognised and IEC compliant.
- RoHS compliant.
The Mersen X221257 is specifically engineered for the protection of modern semiconductor devices used in industrial power conversion systems. Its ultra-fast aR characteristic limits fault energy before semiconductor devices can be damaged, helping maximise equipment reliability and minimise costly downtime.
As an aR semiconductor fuse, the BS17UZ69V40P is intended primarily for short-circuit protection. Suitable overload protection should also be incorporated where required by the equipment manufacturer and applicable electrical standards.
Typical Applications
- Variable frequency drives (VFDs).
- Small industrial inverters.
- UPS systems.
- Industrial motor drives.
- Power converters.
- Rectifiers.
- Industrial automation equipment.
- Semiconductor protection circuits.
