FERRAZ SHAWMUT PC31UD69V400D1A L300022 690VAC 400A

Mersen Protistor High-Speed Semiconductor Fuse 400A

Description

The Mersen PC31UD69V400D1A is a high-performance Protistor square-body fuse designed for the critical protection of power semiconductors. Rated at 400A and 690V AC, this ultra-rapid fuse (aR class) provides excellent safeguarding for components like diodes, thyristors, and IGBTs in high-power applications such as inverters, rectifiers, and variable speed drives. Its high interrupting rating of 200kA ensures safety even under extreme short-circuit conditions. Order now from spareparts2day for expert support and fast delivery.

Specifications

• Manufacturer: Mersen (formerly Ferraz Shawmut)
• Part Number: PC31UD69V400D1A
• Reference Number: L300022
• Voltage Rating: 690V AC
• Current Rating: 400A
• Interrupting Rating: 200kA
• Fuse Class: aR (Ultra-Rapid)
• Fuse Size: 31
• Mounting: Blade Terminals

Label Info

• Brand: Ferraz Shawmut Protistor
• Model: PC31UD69V400D1A
• Voltage: 690V AC
• Current: 400A
• Standard: IEC60269-4

Application

This fuse is ideal for protecting power conversion equipment, including motor drives, UPS systems, soft starters, and solid-state relays from short-circuit faults.

Country of Origin

Made in France.

CO2 Impact

Choosing this component saves approximately 20.0 kg of CO2, equivalent to the emissions of driving a car for 100 km. This is a sustainable choice for your industrial needs.

Availability

Available from stock for immediate dispatch.

FAQ

What does the ‘aR’ class rating signify for this PC31UD69V400D1A fuse?

The ‘aR’ class rating indicates it is an ultra-rapid fuse designed specifically for partial-range short-circuit protection of semiconductors like thyristors, diodes, and transistors. It does not provide overload protection and must be used in series with another device (like a circuit breaker or gG fuse) for that purpose.

Is this fuse a direct replacement for other brands with similar 400A, 690V ratings?

While the voltage and current ratings are primary specifications, for semiconductor protection fuses, it is crucial to also match the I2t (let-through energy) and clearing characteristics. Always consult the technical datasheets of both the original fuse and this Mersen fuse to ensure the protection levels are equivalent before making a substitution.

How can I verify if the fuse has tripped?

This Mersen Protistor fuse is equipped with a visual blown fuse indicator. A small red plunger on the top of the fuse body will pop out when the fuse has operated. In its normal, unused state, this indicator is flush with the fuse body.

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Last Update: Friday, March 13, 2026