Why Choose the Mersen T300489 High-Speed Fuse?
The Mersen T300489 is a high-performance Protistor® square body semiconductor fuse engineered to provide ultra-fast protection for sensitive power electronic equipment. Designed for use in demanding industrial applications, this high-speed fuse safeguards semiconductor devices including IGBTs, thyristors, diodes and power converters against damaging short circuits and fault currents.
As part of the trusted Mersen Protistor® Size 70 series, the T300489 delivers exceptional current limiting performance, helping minimise energy let-through and reducing the risk of costly equipment damage. Manufactured using silver fuse elements embedded in high-grade silica sand, it provides reliable and repeatable protection in critical electrical installations.
With a 250 A current rating and a 1250 V AC IEC / 1300 V AC UL voltage rating, the T300489 is ideal for protecting modern power conversion equipment, variable speed drives, UPS systems, renewable energy equipment and industrial automation installations. Its square body design with flush metric threaded terminals and striker indicator allows secure installation and straightforward fuse monitoring.
Key Advantages
- Ultra-fast aR semiconductor fuse for protecting sensitive power electronics.
- 250 A current rating for high-power industrial applications.
- 1250 V AC IEC / 1300 V AC UL voltage rating.
- Excellent current limiting performance with low let-through energy.
- Integrated striker indicator for convenient fuse status indication.
- Designed for protecting IGBTs, SCRs, diodes and other semiconductor devices.
Key Features
- Mersen Protistor® Size 70 series.
- 250 A rated current.
- 1250 V AC (IEC) / 1300 V AC (UL).
- aR ultra-fast semiconductor protection.
- Square body construction with flush threaded terminals.
- Integrated striker indicator for remote indication options.
- Silver-plated contact surfaces for reliable conductivity.
- Suitable for high interrupting capacity industrial applications.
Reliable Protection for Power Electronics
High-speed semiconductor fuses are specifically designed to interrupt fault currents before they can damage expensive power electronic components. Their ultra-fast response significantly reduces thermal and mechanical stress, helping maximise equipment reliability while reducing maintenance costs.
The Mersen Protistor® range is widely trusted throughout industrial automation, renewable energy, transport and heavy industry, delivering dependable protection for today's advanced power conversion systems.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- Power converters and rectifiers.
- UPS and backup power systems.
- Renewable energy inverters.
- Industrial automation and control equipment.
