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MERSEN FUSE 6,921 CP AR 14.51 0008 FR14AR69V8T

MERSEN FUSE 6,921 CP AR 14.51 0008 FR14AR69V8T

The FR14AR69V8T fuse is engineered for high-speed protection of semiconductor devices and critical power electronics, featuring a 14x51mm cylindrical body and a rapid aR characteristic for optimal circuit safety. Equipped with an integrated striker for precise fuse status indication.

SKU: FR14AR69V8TAlt SKU: FR14AR69V8TMPN: Q1056657
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List Price £21.81 ex VAT
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Sold in packs of 10

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Why Choose the Mersen FR14AR69V8T High-Speed Semiconductor Fuse?

The Mersen FR14AR69V8T is a Protistor® high-speed cylindrical semiconductor fuse with striker, specifically designed to protect sensitive power semiconductor devices from damaging short-circuit currents. Manufactured in accordance with IEC 60269-4, it offers exceptional current-limiting performance and a high breaking capacity, making it ideal for modern industrial power electronics.

Part of the trusted Mersen Protistor® 14 × 51 mm aR series, the FR14AR69V8T features an integrated striker indicator, enabling remote indication when used with compatible fuse holders or monitoring systems. The fuse is intended for partial-range (aR) semiconductor protection, meaning it provides ultra-fast short-circuit protection while overload protection is supplied elsewhere in the circuit.

Rated at 8 A and 690 V AC, the FR14AR69V8T is ideally suited for protecting IGBTs, SCRs, diodes, rectifiers and other semiconductor devices used in variable speed drives, UPS systems, industrial inverters and power converters.

Key Advantages

  • High-speed aR semiconductor fuse for power electronics.
  • 8 A rated current for low-current semiconductor circuits.
  • 690 V AC rated voltage.
  • Integrated striker indicator for fuse operation indication.
  • Current-limiting design minimises fault energy.
  • Compact 14 × 51 mm cylindrical construction.

Key Features

  • Manufacturer: Mersen.
  • Series: Protistor® Size 14 × 51 aR.
  • Model: FR14AR69V8T.
  • Rated current: 8 A.
  • Rated voltage: 690 V AC (IEC).
  • Fuse characteristic: aR.
  • Integrated striker indicator.
  • Suitable for semiconductor protection applications.

Engineered for Semiconductor Protection

Power semiconductor devices can fail within milliseconds during a short circuit. Protistor® high-speed fuses operate significantly faster than conventional industrial fuses, reducing thermal and mechanical stress on expensive semiconductor components.

The FR14AR69V8T is intended for applications where dedicated overload protection is provided elsewhere in the system, while the fuse delivers exceptionally fast short-circuit protection for power electronic equipment.

Typical Applications

  • Variable speed drives.
  • Industrial inverters.
  • UPS systems.
  • Power converters.
  • Rectifiers.
  • Industrial automation equipment.
  • Motor control systems.
  • Power semiconductor modules.

Technical Specifications

Item number Q1056657
Catalogue No FR14AR69V8T
Description High-Speed Cylindrical Fuse Protistor® Size 14x51 aR 690VAC IEC 8A With Striker
EAN/UPC Code 3605340592702
Rated voltage AC IEC 690 V
Ampere Rating 8 A
RoHS Compliant Yes
AC or DC AC
Speed/Characteristic aR
Fuse Size 14x51
Mounting Clip
Clearing I2t At Rated Voltage 30 A²s
Melting I2t 3.3 A²s
AC Max I.R./Breaking Capacity I1: 160 kA
Indication System Yes
Indication System Type Striker
Connection/Terminal Material Silver-Plated Copper
Connection/Terminal Type Ferrule
Product Diameter 14.3 mm
Product Length 51 mm
Sell Pack Quantity 10 EA
Sell Pack Weight 0.2 kg
Sell Pack Width 73 mm
Sell Pack Length 107 mm
Sell Pack Height 15 mm
Product group Semiconductor Protection Fuses
Body/Insulating Material Ceramic
Product Weight 0.02 kg
Power Dissipation at Rated Current Value 2 W
HS Code 85361010
Country of Manufacture Tunisia
Fuse Type Semiconductor
Fuse Size 14x51 mm
Fuse Class aR
Voltage 690 V

Frequently Asked Questions

What is the Mersen FR14AR69V8T used for?

It provides ultra-fast short-circuit protection for power semiconductor devices including IGBTs, SCRs, diodes and rectifiers.

What is the current rating?

The FR14AR69V8T has a rated current of 8 A.

What does the striker indicator do?

The integrated striker provides a mechanical indication when the fuse operates and can be used with compatible monitoring systems.

What is the breaking capacity?

The fuse has a rated breaking capacity of 160 kA, making it suitable for demanding industrial fault conditions.

What does the aR characteristic mean?

An aR fuse provides partial-range semiconductor protection, delivering high-speed short-circuit protection while overload protection is provided separately.

Trusted Industrial Semiconductor Protection

Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs, machine builders and industrial engineers to protect critical semiconductor equipment in demanding industrial environments.

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