High-speed Protistor® fuse with 400A rating, 1250VAC IEC and 1300VAC UL rated voltage, ceramic body, striker indication system, and flush end silver-plated brass terminals for bolted mounting.
£199.31
The Mersen L300505, catalogue number PC73UD13C400TF, is a Protistor® Size 73 square body high-speed semiconductor fuse engineered to provide exceptional protection for modern power electronic equipment. Featuring an ultra-fast aR operating characteristic, it protects IGBTs, thyristors, diodes and other semiconductor devices against damaging short-circuit currents while minimising let-through energy.
Designed for demanding industrial applications, the L300505 combines high breaking capacity with precision fuse elements embedded in solidified sand to deliver low I²t performance and reliable fault interruption. The fuse features TTF threaded terminals (M12), silver-plated contact surfaces and an integrated striker for optional remote indication.
Rated at 400 A, with a 1250 V AC IEC and 1300 V AC UL voltage rating, the Mersen L300505 is ideal for heavy-duty industrial converters, large variable speed drives, renewable energy systems and other high-power semiconductor applications.
Protistor® high-speed semiconductor fuses are engineered specifically to interrupt high fault currents before expensive semiconductor devices suffer catastrophic damage. Their low energy let-through performance helps maximise equipment reliability while reducing downtime and maintenance costs.
The robust square body construction, precision fuse elements, silver-plated contacts and threaded terminal arrangement make the Mersen L300505 suitable for demanding industrial environments requiring dependable high-voltage semiconductor protection.
| Item number | L300505 |
|---|---|
| Catalogue No | PC73UD13C400TF |
| Description | Square Body High-Speed Fuse Protistor® Size 73 aR 1250VAC IEC 1300VAC UL 400A With Striker Flush ends metric threads |
| EAN/UPC Code | 3605340329469 |
| Rated voltage AC UL | 1300 V |
| Rated voltage AC IEC | 1250 V |
| Ampere Rating | 400 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 73 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 205 kA²s |
| Melting I2t | 25 kA²s |
| AC Max I.R./Breaking Capacity | I1: 126 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Brass |
| Connection/Terminal Type | Flush ends |
| Product Width | 73 mm |
| Product Length | 74 mm |
| Product Height | 78.5 mm |
| Sell Pack Quantity | 1 EA |
| Sell Pack Weight | 1.22 kg |
| Sell Pack Width | 110 mm |
| Sell Pack Length | 125 mm |
| Sell Pack Height | 75 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 1.22 kg |
| Power Dissipation at Rated Current Value | 93 W |
| HS Code | 85351000 |
The L300505 is a high-speed semiconductor protection fuse designed to protect IGBTs, thyristors, diodes and other sensitive power electronic devices from high fault currents.
The Mersen L300505 has a rated current of 400 A.
The fuse is rated for 1250 V AC (IEC) and 1300 V AC (UL).
The L300505 features M12 threaded terminals (TTF) for secure bolted installation.
The fuse is designed to protect IGBTs, thyristors, diodes and other power semiconductor devices used in industrial power conversion equipment.
Mersen Protistor® high-speed semiconductor fuses are trusted worldwide by OEMs, electrical engineers and industrial maintenance professionals for reliable protection of 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...
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...