Mersen Protistor Semiconductor Fuse - PC31UD69V400A

Description

This is a high-speed, square body blade fuse from the Mersen Protistor series, previously known as Ferraz Shawmut. Part number B300013, model PC31UD69V400A, is specifically engineered for the protection of power semiconductors. Its extremely fast-acting aR characteristic ensures minimal energy let-through (I2t) during a short-circuit event, safeguarding sensitive and expensive components like diodes, thyristors, and IGBTs in high-power applications such as inverters, motor drives, and rectifiers.

Specifications

• Manufacturer: Mersen (Ferraz Shawmut)
• Part Number: B300013
• Model Number: PC31UD69V400A
• Rated Voltage: 690V AC
• Rated Current: 400A
• Interrupting Rating (IR): 200kA
• Fuse Class: aR (Semiconductor Protection)
• Body Style: Square Body, Blade Type
• Standard: IEC 60269-4
• Features: Blown fuse indicator

Label Info

• Brand: Ferraz Shawmut Protistor
• Type: PC31UD69V400A
• Part No: B300013
• Ratings: 690V AC, 400A, IR=200kA
• Resistance: 0.266 mOhm (at 35 deg C)
• Certifications: UL, CSA, CE

Application

Designed for critical protection in power conversion equipment, including variable speed drives (VFDs), UPS systems, soft starters, and power supplies. The blade design allows for secure mounting in fuse blocks or directly to bus bars.

Country of Origin

This product is manufactured by Mersen, a company with primary manufacturing facilities in France and the USA.

CO2 Impact

Opting for a refurbished high-quality component like this Mersen fuse avoids the CO2 emissions associated with new production. Reusing this part saves an estimated 20.0 kg of CO2, contributing to a more sustainable industrial environment.

Availability

This item is in stock and ready for immediate dispatch. Order now from PLC2Day for expert support and fast delivery.

FAQ

What does the 'aR' class rating mean for this fuse?

The 'aR' class rating indicates a partial-range breaking capacity fuse designed specifically for the short-circuit protection of semiconductors like diodes, thyristors, and IGBTs. It is extremely fast-acting but is not intended for overload protection, which should be handled by another device in the circuit.

Is this fuse a direct replacement for other 400A fuses?

Not necessarily. While the voltage and current ratings are critical, the physical dimensions, mounting style (blade type), and most importantly, the time-current characteristic (aR class) and I2t value must match the original fuse's specifications to ensure proper protection of the sensitive electronic components it is safeguarding.

What does the red dot indicator on the fuse body signify?

The red dot is a visual blown fuse indicator. If the fuse operates due to a fault condition, this indicator will typically pop out or change color, providing an immediate visual signal that the fuse needs to be replaced. In the product photos, the indicator is flush, suggesting the fuse is in good condition.

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Last Update: Friday, March 13, 2026