High-speed fuse designed for semiconductor protection with 500A rating, integrated striker indication, and DIN 110 blade terminals.
£173.89
The Mersen L300551, catalogue number PC71UD11C500D1A, is a Protistor® Size 71 square body high-speed semiconductor fuse engineered to provide outstanding protection for high-power semiconductor equipment. Featuring an ultra-fast aR operating characteristic, it is specifically designed to protect IGBTs, thyristors, diodes and other sensitive semiconductor devices against damaging short-circuit currents.
Designed for demanding industrial applications, the L300551 combines low let-through energy with a high interrupting capacity to minimise semiconductor damage during fault conditions. Precision die-cut fuse elements embedded in solidified sand help control arcing characteristics while silver-plated contacts and non-magnetic hardware ensure dependable long-term performance.
With a 500 A current rating, 1100 V AC IEC and 1200 V AC UL voltage ratings, plus DIN 110 blade terminals and an integrated striker indicator, the Mersen L300551 is ideally suited to large industrial drives, converters, UPS systems, renewable energy equipment and other high-power semiconductor applications.
Protistor® high-speed semiconductor fuses are specifically developed to interrupt extremely high fault currents before expensive semiconductor devices suffer catastrophic damage. Their low energy let-through characteristics help maximise equipment availability while reducing maintenance costs across demanding industrial power conversion systems.
The robust square body construction, precision fuse elements and integrated striker indicator make the Mersen L300551 an excellent choice for engineers specifying reliable protection for high-voltage semiconductor equipment.
| Current | 11 A |
|---|---|
| Item number | L300551 |
| Catalogue No | PC71UD11C500D1A |
| Description | Square Body High-Speed Fuse Protistor® Size 71 aR 1100VAC IEC 1200VAC UL 500A With Striker DIN 110 Blades |
| EAN/UPC Code | 3605340330090 |
| Rated voltage AC UL | 1200 V |
| Rated voltage AC IEC | 1100 V |
| Ampere Rating | 500 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 71 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 441 kA²s |
| Melting I2t | 68 kA²s |
| AC Max I.R./Breaking Capacity | I1: 150 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Copper |
| Connection/Terminal Type | DIN 110 Blades |
| Product Width | 51 mm |
| Product Length | 133.4 mm |
| Product Height | 56.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.56 kg |
| Sell Pack Width | 142 mm |
| Sell Pack Length | 166 mm |
| Sell Pack Height | 62 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.52 kg |
| Power Dissipation at Rated Current Value | 100 W |
| HS Code | 85351000 |
The Mersen L300551 is a high-speed semiconductor protection fuse designed to protect IGBTs, thyristors, diodes and other sensitive power semiconductor devices from short-circuit faults.
The Mersen L300551 has a rated current of 500 A.
The fuse is rated for 1100 V AC (IEC) and 1200 V AC (UL).
The L300551 features DIN 110 blade terminals for secure bolted installation.
The integrated striker provides mechanical fuse-operation indication and can be used with an optional microswitch for remote status monitoring.
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.
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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...