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MERSEN FUSE A070 URD 33 TTI 1250 A070URD33TTI1250
High-speed aR characteristic fuse designed for semiconductor protection with 1250A rating, ceramic body, striker indication, and bolted mounting.
£175.45
Why Choose the Mersen E300453 Protistor® High Speed Fuse?
The Mersen E300453, catalogue number A070UD33TTI1250, is a premium square body high speed semiconductor fuse designed to provide ultra-fast protection for today's advanced power electronic equipment. As part of the trusted Mersen Protistor® Size 33 series, this fuse is specifically engineered to protect IGBTs, thyristors, diodes and other semiconductor devices against damaging short circuits and high fault currents.
Engineered for demanding industrial environments, the E300453 delivers exceptional current limiting performance with low let-through energy, helping to minimise equipment damage and maximise system uptime. Precision die-cut fuse elements embedded in solidified sand, silver-plated contact surfaces and non-magnetic hardware ensure dependable long-term protection for critical power conversion systems.
With a 1250 A current rating and a 690 V AC IEC / 700 V AC UL voltage rating, the Mersen E300453 is ideally suited for high-power drives, converters, UPS systems, renewable energy installations and industrial automation equipment where reliable semiconductor protection is essential.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 1250 A current rating for high-power 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 threaded terminals enable secure bolted installation.
Key Features
- Mersen Protistor® Size 33 series.
- 1250 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 E300453 is widely used in industrial motor drives, renewable energy systems, converters, rectifiers and heavy-duty automation equipment where dependable semiconductor protection is critical 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 | E300453 | |
| Catalogue No | A070UD33TTI1250 | |
| Description | Square Body High-Speed Fuse Protistor® Size 33 aR 690VAC IEC 700VAC UL 1250A With Striker Flush ends UNC threads | |
| EAN/UPC Code | 3605340328653 | |
| Rated voltage AC UL | 700 V | |
| Rated voltage AC IEC | 690 V | |
| Ampere Rating | 1250 A | |
| RoHS Compliant | Yes | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | 33 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 2053 kA²s | |
| Melting I2t | 355 kA²s | |
| AC Max I.R./Breaking Capacity | I1: 200 kA | |
| Design Details | Reinforced Terminal | |
| Indication System | Yes | |
| Indication System Type | Striker | |
| Connection/Terminal Material | Silver-Plated Brass | |
| Connection/Terminal Type | Flush ends | |
| Product Width | 73 mm | |
| Product Length | 50.6 mm | |
| Product Height | 78.5 mm | |
| Sell Pack Quantity | 3 EA | |
| Sell Pack Weight | 2.682 kg | |
| Sell Pack Width | 86 mm | |
| Sell Pack Length | 247 mm | |
| Sell Pack Height | 94 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 0.894 kg | |
| Power Dissipation at Rated Current Value | 150 W | |
| HS Code | 85361090 |
Frequently Asked Questions
What is the Mersen E300453 used for?
The E300453 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 E300453 has a 1250 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 high-power 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.
