High-speed aR characteristic fuse rated at 250A for semiconductor protection with integrated striker indication and metric threaded flush ends.
£129.62
The Mersen A300518 (Catalogue No. PC71UD13C250TF) is a Protistor® Size 71 ultra-fast square body semiconductor fuse designed to protect sensitive power semiconductor devices including diodes, thyristors, IGBTs and similar components used in high-power conversion equipment. It is rated at 250A, 1250VAC (IEC) and 1300VAC (UL), with an aR operating class for semiconductor protection.
Designed for demanding industrial applications, the A300518 features a square body Size 71 construction with flush ends, metric threaded terminals and an integrated striker indicator. Silver-plated contact surfaces, high interrupting capacity and low energy let-through (I²t) provide reliable protection for expensive semiconductor equipment.
The Mersen A300518 is engineered specifically for protecting semiconductor devices operating in demanding power conversion systems. Its ultra-fast aR characteristic limits fault energy before damage can occur to expensive semiconductor components.
Typical applications include variable speed drives, UPS systems, renewable energy converters, industrial rectifiers, battery storage systems, DC drives, welding equipment and other power electronic installations requiring rapid fault interruption.
| Item number | A300518 |
|---|---|
| Catalogue No | PC71UD13C250TF |
| Description | Square Body High-Speed Fuse Protistor® Size 71 aR 1250VAC IEC 1300VAC UL 250A With Striker Flush ends metric threads |
| EAN/UPC Code | 3605340329704 |
| Rated voltage AC UL | 1300 V |
| Rated voltage AC IEC | 1250 V |
| Ampere Rating | 250 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 71 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 72 kA²s |
| Melting I2t | 8.9 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 | 51 mm |
| Product Length | 74 mm |
| Product Height | 56.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.545 kg |
| Sell Pack Width | 90 mm |
| Sell Pack Length | 170 mm |
| Sell Pack Height | 70 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.515 kg |
| Power Dissipation at Rated Current Value | 61 W |
| HS Code | 85351000 |
The Mersen A300518 (PC71UD13C250TF) is a Protistor® Size 71 ultra-fast aR semiconductor protection fuse rated at 250A for 1250VAC IEC and 1300VAC UL applications.
An aR fuse provides partial-range ultra-fast protection specifically for semiconductor devices such as IGBTs, thyristors and diodes, helping minimise fault energy before device damage occurs.
It is commonly used in variable speed drives, UPS systems, industrial converters, renewable energy systems, rectifiers and other power electronic equipment.
Yes. The A300518 incorporates an integrated striker indicator for remote indication or microswitch operation.
Genuine Protistor® fuses are engineered specifically for semiconductor protection, providing high interrupting capacity, low I²t values and reliable performance in demanding industrial environments.
Mersen Protistor® high-speed fuses are trusted worldwide for protecting critical semiconductor devices in industrial drives, renewable energy installations, power conversion equipment and heavy-duty electrical 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...