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 30 LI 0500 A070URD30LI0500
High-speed aR fuse designed for semiconductor protection with striker indication and slotted blade terminals, rated 500A at 690VAC (IEC) and 700VAC (UL).
£139.63
Why Choose the Mersen L300528 Protistor® High-Speed Fuse?
The Mersen L300528, catalogue number A070UD30LI500, is a Protistor® Size 30 square body high-speed semiconductor fuse engineered to protect sensitive power electronic equipment from damaging short-circuit currents. Featuring an ultra-fast aR operating characteristic, it provides exceptional protection for IGBTs, thyristors, diodes and other semiconductor devices used in demanding industrial applications.
Designed for high-performance power conversion equipment, the L300528 combines low let-through energy with a high interrupting capacity to minimise semiconductor damage during fault conditions. The fuse features long slotted blade terminals (LI), silver-plated contacts and precision fuse elements embedded in solidified sand for dependable long-term operation.
With a 500 A current rating, 690 V AC IEC and 700 V AC UL voltage ratings, the Mersen L300528 is ideally suited to variable speed drives, industrial converters, UPS systems, renewable energy equipment and other semiconductor-based power electronics requiring reliable overcurrent protection.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 500 A current rating for demanding industrial applications.
- 690 V AC IEC / 700 V AC UL voltage capability.
- Low I²t characteristics help minimise semiconductor damage.
- High interrupting capacity for reliable fault protection.
- Long slotted blade terminals for secure bolted installation.
- Silver-plated contacts provide excellent conductivity and corrosion resistance.
Key Features
- Mersen Protistor® Size 30 series.
- Catalogue number: A070UD30LI500.
- 500 A rated current.
- 690 V AC IEC / 700 V AC UL rated voltage.
- aR ultra-fast operating characteristic.
- Long slotted blade (LI) terminal configuration.
- Silver-plated contact surfaces.
- Square body ceramic construction.
- Bolted installation.
Reliable Semiconductor Protection
Protistor® semiconductor fuses are specifically engineered to interrupt high fault currents before sensitive semiconductor devices suffer irreversible damage. Their ultra-fast response and low energy let-through characteristics help maximise equipment availability while reducing maintenance costs in industrial power conversion systems.
The Mersen L300528 is manufactured using precision die-cut fuse elements embedded in solidified sand to provide controlled arc extinction, low I²t performance and dependable protection across demanding industrial environments.
Typical Applications
- Variable speed motor drives.
- Industrial power converters.
- IGBT and thyristor protection.
- UPS and backup power systems.
- Renewable energy inverters.
- Battery energy storage systems.
- Industrial 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 | L300528 | |
| Catalogue No | A070UD30LI500 | |
| Description | Square Body High-Speed Fuse Protistor® Size 30 aR 690VAC IEC 700VAC UL 500A With Striker Slotted Blades long | |
| EAN/UPC Code | 3605340329803 | |
| Rated voltage AC UL | 700 V | |
| Rated voltage AC IEC | 690 V | |
| Ampere Rating | 500 A | |
| RoHS Compliant | Yes | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | 30 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 264 kA²s | |
| Melting I2t | 41 kA²s | |
| 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 | 40 mm | |
| Product Length | 148.6 mm | |
| Product Height | 48 mm | |
| Sell Pack Quantity | 3 EA | |
| Sell Pack Weight | 0.9639 kg | |
| Sell Pack Width | 133 mm | |
| Sell Pack Length | 157 mm | |
| Sell Pack Height | 54 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 0.3213 kg | |
| Power Dissipation at Rated Current Value | 88 W | |
| HS Code | 85361090 | |
| Country of Manufacture | France |
Frequently Asked Questions
What is the Mersen L300528 used for?
The Mersen L300528 is a high-speed semiconductor protection fuse designed to protect IGBTs, thyristors, diodes and other sensitive power electronic devices against short-circuit faults.
What is the current rating of the L300528?
The Mersen L300528 has a rated current of 500 A.
What voltage is the fuse rated for?
The fuse is rated for 690 V AC (IEC) and 700 V AC (UL).
What type of terminals does the L300528 use?
The L300528 uses long slotted blade (LI) terminals designed for secure bolted mounting.
What equipment is the L300528 suitable for?
It is commonly used in industrial drives, converters, UPS systems, renewable energy equipment and other power electronic applications requiring ultra-fast semiconductor protection.
Trusted Protection for Critical Power Electronics
Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs, electrical engineers and industrial maintenance professionals to deliver reliable protection for high-performance power electronic systems.
