Why Choose the Mersen W221256 BS17UZ69V35P Semiconductor Fuse?
The Mersen W221256 BS17UZ69V35P is a high-speed Protistor® BS88-4 semiconductor fuse-link designed to provide rapid short-circuit protection for sensitive power semiconductor devices. Featuring an aR operating characteristic, this fuse delivers extremely fast fault clearance to protect IGBTs, thyristors, diodes, GTOs and other semiconductor components used in industrial power electronics.
Rated at 35 A with a 690 V AC IEC and 700 V AC UL voltage rating, the BS17UZ69V35P is suitable for variable speed drives, UPS systems, inverters, rectifiers and similar equipment operating at up to 700 V. The integrated striker indicator provides convenient remote indication capability when used with an optional microswitch.
Manufactured using pure silver fuse elements embedded in solidified silica sand, the W221256 provides excellent current limitation, low I²t values and a very high breaking capacity, helping minimise damage during fault conditions while improving equipment reliability and reducing maintenance costs.
Key Advantages
- High-speed aR semiconductor protection.
- 35 A current rating for industrial power electronics.
- 690 V AC IEC / 700 V AC UL rated.
- 200 kA breaking capacity.
- Integrated striker indicator for remote status indication.
- Low I²t reduces stress on semiconductor devices.
- Compact BS88-4 17 × 49 mm construction.
Key Features
- Manufacturer: Mersen
- Series: Protistor® BS88-4
- Model: BS17UZ69V35P
- Manufacturer SKU: W221256
- Fuse class: aR high-speed semiconductor fuse
- Integrated striker indication system.
- Copper L-bracket terminals.
- Ceramic body with pure silver fuse elements.
- Designed for bolted mounting.
High-Speed Protection for Sensitive Power Electronics
The Mersen W221256 is specifically designed to interrupt high fault currents before they can damage expensive semiconductor devices. Its low let-through energy and high interrupting capacity make it an ideal choice for protecting modern industrial power electronics operating under demanding conditions.
Unlike full-range gR semiconductor fuses, the BS17UZ69V35P uses an aR characteristic, meaning it provides rapid short-circuit protection and should be used alongside suitable overload protection where required by the equipment design.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial inverters.
- Rectifiers.
- UPS systems.
- Motor drives.
- Power converters.
- Industrial automation equipment.
- Semiconductor protection circuits.
