MERSEN FUSE A 070 URD 31 TTI 0315 A070URD31TTI0315

Q: What is the current rating?

The Mersen C300474 is rated at 315 A.

Q: What voltage is this fuse designed for?

It is rated at 690 V AC (IEC) and 700 V AC (UL).

High-speed aR characteristic fuse designed for semiconductor protection in industrial applications up to 690VAC IEC and 700VAC UL at 315A with striker indication and flush ends UNC threads.

SKU: C300474Alt SKU: A070UD31TTI315MPN: C300474

List Price £122.50 ex VAT

Your Price (ex VAT)

£122.50

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Manufacturer Lead Time

£122.50

Why Choose the Mersen C300474 A070UD31TTI315 High-Speed Fuse?

The Mersen C300474 A070UD31TTI315 is a Protistor® Size 31 aR square body high-speed semiconductor fuse designed to provide ultra-fast protection for modern power electronic equipment. It is engineered to protect sensitive semiconductor devices including IGBTs, thyristors, diodes and rectifiers against damaging short-circuit currents while maintaining excellent current-limiting performance.

Constructed using precision die-cut fuse elements embedded in solidified silica sand, the fuse delivers low let-through energy, high interrupting capacity and dependable long-term performance. Silver-plated contact surfaces and non-magnetic hardware enhance reliability, while the integrated striker indicator enables convenient fuse status monitoring.

With a 315 A current rating, 690 V AC (IEC) and 700 V AC (UL) voltage ratings, the C300474 is suitable for industrial drives, UPS systems, converters, renewable energy equipment and other demanding semiconductor protection applications.

Key Advantages

Ultra-fast aR semiconductor protection.
315 A current rating.
690 V AC IEC / 700 V AC UL voltage ratings.
200 kA interrupting capacity.
Integrated striker indicator.
Flush ends with UNC threaded terminals for secure bolted installation.

Key Features

Mersen Protistor® Size 31 aR series.
Catalogue number: A070UD31TTI315.
Square body ceramic construction.
Current-limiting design.
Silver-plated contacts.
Low I²t characteristics.
RoHS compliant.
Designed for semiconductor protection.

Engineered for Semiconductor Protection

Protistor® semiconductor fuses are specifically developed to interrupt fault currents before sensitive power semiconductor devices are damaged. Their ultra-fast operation reduces let-through energy, improves equipment reliability and helps minimise costly downtime in demanding industrial applications.

Typical Applications

Variable frequency drives.
Industrial inverters.
UPS systems.
Motor drives.
Renewable energy converters.
Industrial automation equipment.

Technical Specifications

Item number	C300474
Catalogue No	A070UD31TTI315
Description	Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 700VAC UL 315A With Striker Flush ends UNC threads
EAN/UPC Code	3605340329032
Rated voltage AC UL	700 V
Rated voltage AC IEC	690 V
Ampere Rating	315 A
RoHS Compliant	Yes
AC or DC	AC
Speed/Characteristic	aR
Fuse Size	31
Mounting	Bolted
Clearing I2t At Rated Voltage	44000 A²s
Melting I2t	7500 A²s
AC Max I.R./Breaking Capacity	I1: 200 kA
Indication System	Yes
Indication System Type	Striker
Connection/Terminal Material	Silver-Plated Brass
Connection/Terminal Type	Flush ends
Product Width	51 mm
Product Length	50.6 mm
Product Height	56.5 mm
Sell Pack Quantity	3 EA
Sell Pack Weight	1.155 kg
Sell Pack Width	85 mm
Sell Pack Length	168 mm
Sell Pack Height	65 mm
Product group	Semiconductor Protection Fuses
Body/Insulating Material	Ceramic
Product Weight	0.385 kg
Power Dissipation at Rated Current Value	65 W
HS Code	85361090
Country of Manufacture	France
Fuse Type	Semiconductor
Fuse Class	aR
Voltage	690 V

Frequently Asked Questions

What is the Mersen C300474 used for?

It provides ultra-fast protection for semiconductor devices including IGBTs, thyristors and power diodes in industrial power conversion equipment.

What is the current rating?

The Mersen C300474 is rated at 315 A.

What voltage is this fuse designed for?

It is rated at 690 V AC (IEC) and 700 V AC (UL).

Does it include a striker indicator?

Yes. The fuse incorporates an integrated striker indicator for local or remote status indication.

Which applications is it suitable for?

Typical applications include industrial drives, UPS systems, converters, renewable energy equipment and other semiconductor-based power electronics.

Trusted Semiconductor Protection Worldwide

Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs and industrial engineers to protect critical power electronic systems.

Item number	C300474
Catalogue No	A070UD31TTI315
Description	Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 700VAC UL 315A With Striker Flush ends UNC threads
EAN/UPC Code	3605340329032
Rated voltage AC UL	700 V
Rated voltage AC IEC	690 V
Ampere Rating	315 A
RoHS Compliant	Yes
AC or DC	AC
Speed/Characteristic	aR
Fuse Size	31
Mounting	Bolted
Clearing I2t At Rated Voltage	44000 A²s
Melting I2t	7500 A²s
AC Max I.R./Breaking Capacity	I1: 200 kA
Indication System	Yes
Indication System Type	Striker
Connection/Terminal Material	Silver-Plated Brass
Connection/Terminal Type	Flush ends
Product Width	51 mm
Product Length	50.6 mm
Product Height	56.5 mm
Sell Pack Quantity	3 EA
Sell Pack Weight	1.155 kg
Sell Pack Width	85 mm
Sell Pack Length	168 mm
Sell Pack Height	65 mm
Product group	Semiconductor Protection Fuses
Body/Insulating Material	Ceramic
Product Weight	0.385 kg
Power Dissipation at Rated Current Value	65 W
HS Code	85361090
Country of Manufacture	France
Fuse Type	Semiconductor
Fuse Class	aR
Voltage	690 V

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