High-speed aR characteristic fuse designed for semiconductor protection with integrated striker indication and plain blade terminals. Rated for 50A, 1250VAC IEC, and 1300VAC UL.
£127.34
The Mersen J301423 is a premium Protistor® Size 70 aR square body high-speed semiconductor fuse designed to provide exceptional protection for modern power conversion equipment. Specifically engineered for safeguarding sensitive semiconductor devices, it delivers ultra-fast fault interruption and outstanding current limiting to protect IGBTs, thyristors, GTOs and power diodes from damaging short-circuit currents.
Manufactured as part of Mersen's internationally recognised Protistor® semiconductor fuse range, the J301423 features pure silver fuse elements embedded in solidified sand, silver-plated contact surfaces, plain blade terminals and an integrated striker for remote indication. Its robust construction helps maximise equipment reliability while reducing maintenance requirements and costly downtime.
With a 50 A rated current and a 1250 V AC IEC / 1300 V AC UL voltage rating, the J301423 is ideally suited to industrial drives, converters, inverters, UPS systems and other high-performance semiconductor applications requiring dependable circuit protection.
High-speed semiconductor fuses are engineered to interrupt fault currents before excessive thermal or electrical energy reaches sensitive semiconductor devices. Their low let-through energy helps improve equipment reliability while reducing maintenance costs and minimising unplanned downtime.
The Mersen Protistor® Size 70 range is trusted worldwide by OEMs, panel builders and industrial engineers for demanding power conversion applications where dependable semiconductor protection is essential.
| Item number | J301423 |
|---|---|
| Catalogue No | PC70UD13C50PA |
| Description | Square Body High-Speed Fuse Protistor® Size 70 aR 1250VAC IEC 1300VAC UL 50A Striker Plain Blades |
| EAN/UPC Code | 3605340447521 |
| Rated voltage AC UL | 1300 V |
| Rated voltage AC IEC | 1250 V |
| Ampere Rating | 50 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 72 |
| Mounting | Clip |
| Clearing I2t At Rated Voltage | 980 A²s |
| Melting I2t | 120 A²s |
| AC Max I.R./Breaking Capacity | I1: 126 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Copper |
| Connection/Terminal Type | Plain Blades |
| Product Width | 39.8 mm |
| Product Length | 123.4 mm |
| Product Height | 49.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.092 kg |
| Sell Pack Width | 140 mm |
| Sell Pack Length | 143 mm |
| Sell Pack Height | 65 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.364 kg |
| Power Dissipation at Rated Current Value | 16 W |
| HS Code | 85351000 |
The J301423 is designed to provide ultra-fast short-circuit protection for semiconductor devices including IGBTs, thyristors, GTOs and power diodes.
The fuse has a rated current of 50 A for industrial semiconductor protection applications.
It is rated for 1250 V AC (IEC) and 1300 V AC (UL) systems.
The aR operating characteristic provides ultra-fast short-circuit protection specifically for semiconductor devices and is intended for semiconductor protection rather than overload protection.
It is commonly installed in industrial drives, converters, UPS systems, renewable energy equipment and other power conversion applications.
Mersen Protistor® semiconductor fuses are trusted worldwide for delivering dependable, ultra-fast protection for industrial power electronics, helping maximise equipment availability while protecting valuable semiconductor devices.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
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...