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MERSEN FUSE A 070 URD 33 KI 1250 A070UD33KI1250
High-speed aR fuse designed for semiconductor protection with striker slotted blades, suitable for 690VAC IEC and 700VAC UL applications up to 1250A.
£180.98
Why Choose the Mersen E300246 Protistor® High Speed Fuse?
The Mersen E300246, catalogue number A070UD33KI1250, is a premium square body high speed semiconductor fuse designed to provide ultra-fast protection for modern power electronic equipment. Part of the proven 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.
Designed for demanding industrial environments, the E300246 delivers exceptional current limiting performance with low let-through energy, helping to reduce damage to expensive equipment and maximise system uptime. Precision die-cut fuse elements embedded in solidified sand, together with silver-plated contact surfaces and non-magnetic hardware, provide 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 E300246 is ideally suited for variable frequency 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.
- Robust square body construction with silver-plated contacts.
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.
- Square body fuse with short slotted blade terminals.
- Integrated striker indicator for remote status indication.
- 200 kA breaking capacity.
- Silver-plated contacts and non-magnetic hardware.
Reliable Protection for Industrial Power Electronics
High speed semiconductor fuses are specifically designed to interrupt fault currents before expensive 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 E300246 is widely used in industrial motor drives, renewable energy systems, power converters, UPS installations and automation equipment, providing dependable protection for critical semiconductor devices operating in demanding industrial environments.
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 | E300246 | |
| Catalogue No | A070UD33KI1250 | |
| Description | Square Body High-Speed Fuse Protistor® Size 33 aR 690VAC IEC 700VAC UL 1250A With Striker Slotted Blades short | |
| EAN/UPC Code | 3605340325652 | |
| 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 Copper | |
| Connection/Terminal Type | Slotted Blades | |
| Product Width | 73 mm | |
| Product Length | 134 mm | |
| Product Height | 78.5 mm | |
| Sell Pack Quantity | 3 EA | |
| Sell Pack Weight | 2.5353 kg | |
| Sell Pack Width | 145 mm | |
| Sell Pack Length | 245 mm | |
| Sell Pack Height | 90 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 0.8451 kg | |
| Power Dissipation at Rated Current Value | 180 W | |
| HS Code | 85361090 |
Frequently Asked Questions
What is the Mersen E300246 used for?
The E300246 provides ultra-fast protection for semiconductor devices such as IGBTs, thyristors and diodes used in industrial power conversion equipment.
What is the current rating of this fuse?
The Mersen E300246 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 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.
