Mersen (Ferraz Shawmut) PC31UD69V400A Protistor High-Speed Fuse

Description

The Mersen PC31UD69V400A is a high-performance semiconductor protection fuse from the renowned Protistor series. This square body fuse is designed to provide extremely fast-acting protection against short-circuits for power semiconductors in demanding industrial applications. Its robust construction ensures reliability and safety in critical systems like frequency converters, soft starters, and power rectifiers.

Specifications

• Manufacturer: Mersen (Ferraz Shawmut)
• Part Number: PC31UD69V400A
• Reference Number: B300013C
• Voltage Rating: 690V AC
• Current Rating: 400A
• Fuse Class: aR
• Interrupting Rating (IR): 200kA at 690V AC
• Body Size: 31
• Mounting: Blade Style

Label Info

• Standard: IEC 60269-4
• UL Recognized

Application

This fuse is ideal for protecting power electronics such as diodes, thyristors, GTOs, and IGBTs in various applications, including variable speed drives, power supplies, and inverters.

Country of Origin

Made in France.

CO2 Impact

By purchasing this reused component, you contribute to a circular economy and help avoid the CO2 emissions associated with new production, which we estimate at 16.0 kg. This is comparable to the emissions of a car driving 80 kilometers.

Availability

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

FAQ

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

While primarily rated for 690V AC, many high-speed fuses can be used in DC applications, but typically at a de-rated voltage. You must consult the official Mersen datasheet for this specific model to verify its DC voltage rating and time-constant (L/R) limitations before using it in any DC circuit.

Proper mounting torque is critical to prevent overheating at the terminals. According to the Mersen datasheet for size 31 square body fuses, the recommended tightening torque is typically around 20-25 N-m (Newton-meters). Always confirm with the latest datasheet to ensure safe and reliable operation.

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Last Update: Friday, March 13, 2026