FERRAZ SHAWMUT DF3QF63002 X300078 660-700VAC 630A

Product Details

Description

This is a Telemecanique DF3QF63002, a high-speed semiconductor fuse assembly. It features a genuine Ferraz Shawmut PROTISTOR fuse (model X300078) designed for superior protection of power electronics. These fuses are essential for safeguarding sensitive components like diodes, SCRs, and IGBTs from damaging short-circuits and overcurrents. This item is new old stock in its original packaging, providing reliable performance for critical applications.

Specifications

• Manufacturer: Mersen (Ferraz Shawmut)
• Brand (Assembly): Telemecanique
• Part Number (Assembly): DF3QF63002
• Part Number (Fuse): X300078
• Current Rating: 63A
• Voltage Rating: 700V AC
• Type: High-Speed Semiconductor Fuse
• Series: PROTISTOR

Label Info

• FERRAZ PROTISTOR X300078
• 66A-700V AC B38R
• 0.185 mOhm (at 20 deg C)

Application

Ideal for use in variable speed drives, power converters, rectifiers, and other power electronic equipment where fast-acting protection is critical.

Country of Origin

Made in France.

CO2 Impact

Reusing this industrial part saves an estimated 10.0 kg of CO2 compared to producing a new one. This saving is equivalent to the emissions from driving an average car for 50 kilometers.

Availability

In stock and ready for dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

Question?

What does the ‘Protistor’ designation mean?

Answer:

‘Protistor’ is Mersen’s (formerly Ferraz Shawmut) brand name for their line of high-speed, current-limiting fuses designed specifically for the protection of power semiconductors like diodes, thyristors, and IGBTs. They have a very low I2t value to clear faults quickly and prevent damage to sensitive electronic components.

Question?

Can I use a standard industrial fuse instead of this semiconductor fuse?

Answer:

No, it is highly inadvisable. Standard industrial fuses (like class gG or aM) are designed for motor or general circuit protection and do not have the speed or low I2t characteristics required to protect semiconductors. Using a standard fuse will likely result in the destruction of the electronic components it is supposed to protect during a fault event.

Question?

The assembly has a Telemecanique part number, but the fuse is Ferraz. Is this a compatible part?

Answer:

Yes, this is a common practice in the industry. Telemecanique (now part of Schneider Electric) often sourced high-quality specialized components like these Ferraz Protistor fuses and integrated them into their own systems, assigning their own part number (DF3QF63002) to the complete assembly, which may include the fuse and an indicator or microswitch. The core component is the Ferraz X300078 fuse.

Last Update: Friday, March 13, 2026

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