High-speed aR fuse designed for semiconductor protection with striker slotted blades, suitable for 690VAC IEC and 700VAC UL applications up to 1250A.
£301.63
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.
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.
| 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 |
The E300246 provides ultra-fast protection for semiconductor devices such as IGBTs, thyristors and diodes used in industrial power conversion equipment.
The Mersen E300246 has a 1250 A rated current.
It is rated for 690 V AC (IEC) and 700 V AC (UL) applications.
The aR operating class provides partial-range ultra-fast protection specifically designed for semiconductor devices against short-circuit faults.
It is commonly installed in variable speed drives, converters, UPS systems, renewable energy equipment and industrial power electronic installations.
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.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...