Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
MERSEN FUSE A 070 URD 31 LI 0450 A070URD31LI0450
High-speed fuse with 450A rating, aR characteristic, ceramic square body, striker indication, and slotted blade terminals for industrial and power electronics protection.
£97.58
Why Choose the Mersen A300702 High-Speed Semiconductor Fuse?
The Mersen A300702 is a heavy-duty Protistor® square-body high-speed semiconductor fuse engineered to protect sensitive power electronic components against destructive short-circuit currents. Its ultra-fast operating characteristic makes it suitable for safeguarding IGBT modules, thyristors, diodes and other semiconductor devices used in high-power industrial electrical systems.
As part of the established Mersen Protistor® semiconductor fuse range, the A300702 provides rapid fault interruption with low let-through energy. This helps limit thermal and mechanical stress on protected components, reducing the risk of secondary equipment damage and improving the availability of critical electrical systems.
Featuring a rated current of 1400 A and voltage ratings of 1250 V AC to IEC standards and 1300 V AC to UL standards, the Mersen A300702 is suitable for high-capacity variable frequency drives, industrial converters, rectifiers, UPS equipment and power-control installations. Its robust square-body construction and blade connections support secure installation in compatible fuse holders and bolted busbar assemblies.
Key Advantages
- Ultra-fast aR semiconductor fuse protection.
- 1400 A rated current for high-power industrial equipment.
- 1250 V AC IEC and 1300 V AC UL voltage ratings.
- Low let-through energy helps protect valuable semiconductor modules.
- Rapid short-circuit interruption helps minimise secondary equipment damage.
- Heavy-duty construction for demanding power-conversion applications.
Key Features
- Mersen Protistor® high-speed fuse series.
- Square-body semiconductor fuse.
- 1400 A rated current.
- 1250 V AC IEC / 1300 V AC UL rated voltage.
- aR ultra-fast utilisation category.
- Heavy-duty blade terminal connections.
- Low let-through energy and controlled arc interruption.
- Engineered for short-circuit protection of power semiconductors.
Reliable Protection for High-Power Electronics
Power semiconductor devices can sustain permanent damage when exposed to excessive short-circuit energy, even for a very brief period. High-speed fuses such as the Mersen A300702 use precision-engineered fuse elements to interrupt fault currents rapidly and restrict the amount of energy transferred into the protected circuit.
This controlled fault-clearing performance makes the A300702 suitable for installations where equipment availability, semiconductor protection and operational reliability are essential. Correct fuse coordination can help protect expensive power modules, minimise secondary damage and reduce maintenance-related downtime.
Typical Applications
- High-power variable frequency drives.
- Industrial inverters and converters.
- Rectifier and thyristor assemblies.
- Uninterruptible power supply systems.
- High-capacity motor drives and soft starters.
- Industrial power supplies and automation equipment.
Technical Specifications
Tick the specs you need, then view products that match.
| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Class | aR | |
| Voltage | 690 V | |
| Item number | A300702 | |
| Catalogue No | A070UD31LI450 | |
| Description | Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 700VAC UL 450A With Striker Slotted Blades long | |
| EAN/UPC Code | 3605340332445 | |
| Rated voltage AC UL | 700 V | |
| Rated voltage AC IEC | 690 V | |
| Ampere Rating | 450 A | |
| RoHS Compliant | Yes | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | 31 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 155000 A²s | |
| Melting I2t | 26500 A²s | |
| AC Max I.R./Breaking Capacity | I1: 200 kA | |
| Indication System | Yes | |
| Indication System Type | Striker | |
| Connection/Terminal Material | Silver-Plated Copper | |
| Connection/Terminal Type | Slotted Blades | |
| Product Width | 51 mm | |
| Product Length | 148.6 mm | |
| Product Height | 56.5 mm | |
| Sell Pack Quantity | 3 EA | |
| Sell Pack Weight | 1.2519 kg | |
| Sell Pack Width | 155 mm | |
| Sell Pack Length | 165 mm | |
| Sell Pack Height | 60 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 0.4173 kg | |
| Power Dissipation at Rated Current Value | 70 W | |
| HS Code | 85361090 | |
| Country of Manufacture | France |
Frequently Asked Questions
What is the Mersen A300702 used for?
The Mersen A300702 provides high-speed short-circuit protection for semiconductor devices installed in industrial drives, converters, rectifiers and other high-power electronic equipment.
What is the rated current of the Mersen A300702?
The Mersen A300702 has a rated current of 1400 A.
What voltage is the A300702 rated for?
The fuse is rated for up to 1250 V AC under IEC specifications and 1300 V AC under UL specifications.
What does the aR fuse classification mean?
The aR classification identifies a partial-range fuse with an ultra-fast operating characteristic designed specifically for short-circuit protection of semiconductor devices.
Does the A300702 provide overload protection?
An aR semiconductor fuse is primarily intended for short-circuit protection. Suitable overload protection should be provided separately by the equipment’s monitoring, control or protective system.
Trusted by Power Electronics Professionals
Mersen Protistor® fuses are specified by industrial engineers, system integrators and equipment manufacturers for dependable high-speed protection of critical semiconductor and power-conversion equipment.
