Mersen Protistor High-Speed Square Body Fuse

Description

The Mersen PC30UD69V350TF is a Protistor series, ultra-rapid fuse designed for the critical protection of power semiconductors. Engineered by Ferraz Shawmut, now Mersen, this fuse offers superior performance in safeguarding diodes, thyristors, GTOs, and IGBT devices against damaging short-circuit currents. Its square body design and bolted T-type mounting ensure a secure and reliable connection in high-power applications such as frequency converters, UPS systems, and motor drives.

Specifications

• Manufacturer: Mersen (Ferraz Shawmut)
• Product Line: Protistor
• Model: PC30UD69V350TF
• Reference Number: A300058C
• Rated Voltage: 690V AC
• Rated Current: 350A
• Interrupting Rating (IR): 200kA
• Fuse Class: aR (Ultra-Rapid, Semiconductor Protection)
• Fuse Size: 30
• Features: Includes a visual blown fuse indicator

Label Info

• Classe aR
• Standard: EN 60.269

Application

This high-speed fuse is essential for protecting semiconductor devices in demanding industrial environments, including AC/DC drives, power converters, soft-starters, and solid-state relays.

Country of Origin

Made in Italy.

CO2 Impact

Opting for this component helps avoid approximately 16 kg of CO2 emissions compared to manufacturing a new one, contributing to a more sustainable industrial operation.

Availability

In stock and ready for dispatch. Order now from PLC2Day for expert support and fast delivery.

FAQ

The 'aR' class designation indicates an ultra-rapid fuse designed specifically for semiconductor protection (partial-range breaking capacity). It can interrupt short-circuit currents from approximately 5 times its rated current up to its maximum breaking capacity, making it ideal for protecting devices like thyristors, diodes, and IGBTs from fault currents.

The visual indicator is a single-use feature. When the fuse element melts due to an overcurrent or short-circuit event, a small plunger is released, causing the red dot to pop out or change color. This provides a clear, local indication that the fuse has operated and must be replaced. The entire fuse is a single-use protective device.

For a size 30 Protistor fuse like the PC30UD69V350TF, Mersen's datasheets typically recommend a specific tightening torque for the bolts to ensure proper electrical contact and heat dissipation without damaging the fuse body. While you should always consult the latest manufacturer datasheet, a typical value for this size is around 10 to 12 Nm. Incorrect torque can lead to overheating or a poor connection.

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Last Update: Friday, March 13, 2026