FERRAZ SHAWMUT A300058C 6.9URD30TTF0350 690VAC 350A

Ferraz Shawmut A300058C High-Speed Semiconductor Fuse

Description

The Ferraz Shawmut Protistor A300058C is a high-performance square-body fuse, engineered for the demanding requirements of semiconductor protection. It provides extremely fast-acting protection (aR class) against short-circuit currents, making it ideal for safeguarding power converters, drives, UPS systems, and other power electronic devices. This model includes a visual trip indicator for quick fault diagnosis.

Specifications

• Manufacturer: Ferraz Shawmut (now Mersen)
• Part Number: A300058C
• Reference Number: 6.9URD30TTF0350
• Voltage Rating: 690V AC
• Current Rating: 350A
• Fuse Class: aR
• Breaking Capacity: 200kA
• Body Style: Square Body, French Style Size 30
• Features: Visual trip indicator

Label Info

• Protistor A300058
• 690V~ 350A
• EN 60 269
• Class aR

Application

Designed for the critical protection of power semiconductors such as diodes, thyristors, GTOs, and IGBTs in high-power applications including variable speed drives, power rectifiers, and soft starters.

Country of Origin

Made in France.

CO2 Impact

By purchasing this reused component, you help avoid the emission of 10.0 kg of CO2, which is equivalent to driving a car for approximately 50 kilometers. This choice supports a more sustainable industrial environment.

Availability

This item is in stock and ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

What does the ‘aR’ class rating signify for this fuse?

The ‘aR’ class rating indicates a partial-range breaking capacity fuse, specifically designed for short-circuit protection of semiconductor devices like thyristors, diodes, and IGBTs. It has a very fast clearing time but is not intended for overload protection.

Can this A300058C fuse be used in a DC circuit?

While primarily rated for 690V AC, many high-speed fuses like this can be used in DC applications, but typically at a lower voltage rating. You must consult the official Mersen datasheet for the specific DC voltage rating and time constant (L/R) limitations to ensure safe operation.

How can I tell if this fuse has blown?

This fuse is equipped with a visual trip indicator. The small red dot, visible on the top surface, will pop out when the fuse has cleared a fault. This provides an immediate visual confirmation of the fuse’s status.

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Last Update: Friday, March 13, 2026