High-speed Protistor® fuse delivering reliable short-circuit protection up to 1100A at 1250VAC with striker indication and flush metric thread ends.
£562.57
The Mersen J300733 is an industrial high-speed semiconductor fuse developed to protect sensitive power electronic components from damaging short-circuit currents. Its rapid operating characteristics help interrupt severe electrical faults before excessive thermal and electrical energy can reach valuable semiconductor devices.
Designed for demanding power conversion applications, the J300733 can help protect components such as IGBTs, thyristors, rectifiers and power diodes. Its current-limiting performance reduces fault let-through energy, helping minimise secondary equipment damage, lower maintenance requirements and improve system availability.
The Mersen J300733 is suitable for use in compatible industrial drives, converters, inverters, uninterruptible power supplies and specialist power control equipment. Before installation, its current rating, voltage rating, operating class, dimensions and connection arrangement should be checked against the original fuse and equipment manufacturer’s specification.
High-speed semiconductor fuses are designed to respond more rapidly than conventional general-purpose fuses. During a short-circuit fault, they limit the electrical and thermal energy transferred to vulnerable semiconductor components, helping prevent extensive damage to power modules and associated equipment.
Correct fuse selection is essential for safe and reliable protection. The current rating, voltage rating, operating class, breaking capacity, dimensions and terminal arrangement of the Mersen J300733 must correspond with the requirements of the protected circuit and the original equipment manufacturer.
| Item number | J300733 |
|---|---|
| Catalogue No | PC273UD13C11CTF |
| Description | Square Body High-Speed Fuse Protistor® 2x73 aR 1250VAC IEC 1100A With Striker Flush ends metric threads |
| EAN/UPC Code | 3605340332780 |
| Rated voltage AC IEC | 1250 V |
| Ampere Rating | 1100 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 2x73 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 1860 kA²s |
| Melting I2t | 228 kA²s |
| AC Max I.R./Breaking Capacity | I1: 100 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Brass |
| Connection/Terminal Type | Flush ends |
| Product Width | 167 mm |
| Product Length | 91 mm |
| Product Height | 78.5 mm |
| Sell Pack Quantity | 1 EA |
| Sell Pack Weight | 2.53 kg |
| Sell Pack Width | 90 mm |
| Sell Pack Length | 205 mm |
| Sell Pack Height | 95 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 2.53 kg |
| Power Dissipation at Rated Current Value | 244 W |
| HS Code | 85351000 |
| Country of Manufacture | France |
The Mersen J300733 is intended to provide high-speed short-circuit protection for semiconductor devices installed in compatible industrial power electronic equipment.
It may be used in suitable circuits containing sensitive components such as IGBTs, thyristors, rectifiers and power diodes.
A high-speed fuse interrupts severe fault currents rapidly and limits the energy reaching sensitive semiconductor components, helping reduce the risk of extensive equipment damage.
It may be used in compatible industrial drives, converters, inverters, UPS systems, power supplies and other power conversion equipment.
It should only be used as a replacement when its current rating, voltage rating, utilisation category, breaking capacity, physical dimensions and mounting arrangement match the original equipment requirements.
Mersen high-speed semiconductor fuses are used in industrial power electronic systems where rapid fault interruption, effective current limitation and dependable component protection are essential.
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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...