High-speed aR class fuse designed for semiconductor protection up to 700A at 1200VAC IEC and 1300VAC UL. Features slotted blade terminals with striker indication and bolted mounting.
£262.27
The Mersen J300687 is a premium Protistor® Size 73 aR square body high-speed semiconductor fuse designed to provide advanced protection for modern power electronic equipment. Engineered specifically for safeguarding sensitive semiconductor devices, it delivers ultra-fast fault interruption and exceptional current limiting to protect IGBTs, thyristors, rectifiers and power diodes against damaging short-circuit currents.
Part of Mersen's internationally recognised Protistor® Size 73 range, the J300687 incorporates silver-plated contact surfaces, solidified sand construction for controlled arc performance and an integrated striker for remote indication. These features help maximise equipment reliability while reducing maintenance requirements and costly downtime.
With a 700 A rated current and a 1200 V AC IEC / 1300 V AC UL voltage rating, the J300687 is ideally suited to industrial drives, converters, inverters, UPS systems, renewable energy installations and other high-power semiconductor applications.
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 unplanned downtime.
The Mersen Protistor® Size 73 range is trusted worldwide by OEMs, panel builders and industrial engineers for demanding power conversion applications where dependable semiconductor protection is essential.
| Item number | J300687 |
|---|---|
| Catalogue No | A130UD73LI700 |
| Description | Square Body High-Speed Fuse Protistor® Size 73 aR 1200VAC IEC 1300VAC UL 700A With Striker Slotted Blades long |
| EAN/UPC Code | 3605340332230 |
| Rated voltage AC UL | 1300 V |
| Rated voltage AC IEC | 1200 V |
| Ampere Rating | 700 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 73 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 900 kA²s |
| Melting I2t | 110 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 | Slotted Blades |
| Product Width | 73 mm |
| Product Length | 157.4 mm |
| Product Height | 78.5 mm |
| Sell Pack Quantity | 1 EA |
| Sell Pack Weight | 1.25 kg |
| Sell Pack Width | 100 mm |
| Sell Pack Length | 180 mm |
| Sell Pack Height | 80 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 1.25 kg |
| Power Dissipation at Rated Current Value | 146 W |
| HS Code | 85351000 |
The J300687 is designed to protect power semiconductor devices such as IGBTs, thyristors, rectifiers and diodes from damaging short-circuit currents.
The fuse has a rated current of 700 A for high-power industrial semiconductor protection.
It is rated for 1200 V AC (IEC) and 1300 V AC (UL) systems.
The aR operating characteristic provides ultra-fast short-circuit protection specifically for semiconductor devices without overload protection.
It is commonly installed in industrial drives, converters, UPS systems, renewable energy equipment and other high-power power conversion applications.
Mersen Protistor® semiconductor fuses are trusted worldwide for delivering dependable, ultra-fast protection for industrial power electronics, helping maximise equipment availability and protect 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...