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MERSEN FUSE A 070 URD 31 TTI 0400 A070URD31TTI0400
High-speed aR characteristic fuse with square ceramic body, striker indication system, flush end terminals with UNC threads, rated 400A at 690VAC IEC and 700VAC UL.
£82.15
Why Choose the Mersen E300476 Protistor® High Speed Fuse?
The Mersen E300476, catalogue number A070UD31TTI400, is a premium square body high speed semiconductor fuse engineered to provide ultra-fast protection for modern power electronic equipment. Part of the trusted Mersen Protistor® Size 31 series, this fuse is specifically designed to protect IGBTs, thyristors, diodes and other semiconductor devices from damaging short circuits and fault currents.
Designed for demanding industrial applications, the E300476 combines exceptional current limiting performance with low let-through energy to help minimise damage to expensive equipment and maximise system uptime. Precision die-cut fuse elements embedded in solidified sand, silver-plated contact surfaces and non-magnetic hardware provide dependable long-term protection for critical power conversion equipment.
With a 400 A current rating and a 690 V AC IEC / 700 V AC UL voltage rating, the Mersen E300476 is ideally suited for variable frequency drives, UPS systems, converters, renewable energy installations and industrial automation equipment requiring reliable semiconductor protection.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 400 A current rating for demanding industrial applications.
- 690 V AC IEC / 700 V AC UL voltage rating.
- Provides dependable protection for IGBTs, thyristors and diode modules.
- Low I²t characteristics help minimise equipment damage.
- Flush end UNC threaded terminals enable secure bolted installation.
Key Features
- Mersen Protistor® Size 31 series.
- 400 A rated current.
- 690 V AC IEC / 700 V AC UL rated voltage.
- aR ultra-fast operating characteristic.
- Flush end terminals with UNC threaded holes.
- Integrated striker indicator for remote fuse monitoring.
- 200 kA breaking capacity.
- Silver-plated contacts with non-magnetic hardware.
Reliable Protection for Industrial Power Electronics
High speed semiconductor fuses are specifically engineered to interrupt fault currents before sensitive semiconductor devices can be damaged. The Mersen Protistor® range delivers exceptionally fast fault clearing with low I²t values, making it ideal for protecting modern power conversion equipment while improving equipment reliability and reducing costly downtime.
The E300476 is widely used in industrial motor drives, renewable energy systems, converters, rectifiers and automation equipment where dependable semiconductor protection is essential for continuous operation.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor control systems.
- Power converters and rectifiers.
- UPS and standby power systems.
- Renewable energy inverter systems.
- Industrial automation and OEM machinery.
Technical Specifications
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| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Class | aR | |
| Voltage | 690 V | |
| Item number | E300476 | |
| Catalogue No | A070UD31TTI400 | |
| Description | Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 700VAC UL 400A With Striker Flush ends UNC threads | |
| EAN/UPC Code | 3605340329056 | |
| Rated voltage AC UL | 700 V | |
| Rated voltage AC IEC | 690 V | |
| Ampere Rating | 400 A | |
| RoHS Compliant | Yes | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | 31 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 110000 A²s | |
| Melting I2t | 19000 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 | 68 W | |
| HS Code | 85361090 | |
| Country of Manufacture | France |
Frequently Asked Questions
What is the Mersen E300476 used for?
The E300476 provides ultra-fast protection for semiconductor devices including IGBTs, thyristors and diodes used in industrial power conversion equipment.
What is the current rating of this fuse?
The Mersen E300476 has a 400 A rated current.
What voltage is the fuse designed for?
It is rated for 690 V AC (IEC) and 700 V AC (UL) applications.
What does the aR operating characteristic mean?
The aR operating class provides partial-range ultra-fast protection specifically designed for semiconductor devices against short-circuit faults.
Where is this fuse commonly installed?
It is commonly installed in variable speed drives, converters, UPS systems, renewable energy equipment and industrial power electronic installations.
Trusted for Semiconductor Protection Worldwide
Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs, panel builders and industrial engineers to provide dependable protection for critical power electronic equipment operating in demanding industrial environments.
