Why Choose the Mersen J330242 Protistor® High-Speed Fuse?
The Mersen J330242, catalogue number DN00UB69V250L, is a Protistor® NH size 00 square body high-speed semiconductor fuse designed to provide ultra-fast protection for sensitive power semiconductor devices. Featuring an aR operating characteristic, this fuse offers exceptional short-circuit protection for diodes, thyristors, GTOs and IGBTs used in industrial power conversion equipment. It is manufactured with DIN 80 blade contacts and an integrated striker indicator for rapid fault indication.
Rated at 250 A and 690 V AC (IEC), the J330242 delivers excellent current-limiting performance with low let-through energy (I²t), helping to minimise damage to expensive semiconductor components during fault conditions. Pure silver fuse elements embedded in solidified silica sand, together with silver-plated contacts, provide reliable protection and a high interrupting capacity of 200 kA.
The J330242 is ideal for industrial drives, UPS systems, rectifiers, inverters, renewable energy installations and other demanding power conversion applications where dependable semiconductor protection is essential.
Key Advantages
- Genuine Mersen Protistor® semiconductor protection fuse.
- 250 A current rating.
- 690 V AC IEC rated voltage.
- aR ultra-fast operating characteristic.
- Integrated striker indicator for visual or remote signalling.
- High 200 kA interrupting capacity.
Key Features
- Manufacturer: Mersen
- Item number: J330242
- Catalogue number: DN00UB69V250L
- Series: Protistor®
- NH size 00 square body fuse.
- aR operating class.
- DIN 80 blade contacts.
- Integrated striker indicator.
Designed for Semiconductor Protection
Protistor® aR semiconductor fuses are engineered to interrupt fault currents before excessive thermal energy reaches sensitive semiconductor devices. Their low I²t characteristics help maximise equipment reliability while reducing maintenance costs and costly downtime.
The J330242 is suitable for converters, motor drives, UPS systems, renewable energy equipment and industrial automation systems requiring dependable high-speed semiconductor protection.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial power converters.
- Rectifiers and inverters.
- UPS systems.
- Photovoltaic and renewable energy systems.
- Industrial automation equipment.
- Semiconductor protection circuits.
