High-speed aR characteristic fuse rated 250A, 1250VAC IEC and 1300VAC UL, with integrated striker indication and DIN 110 blade terminals for semiconductor protection.
£125.87
The Mersen B300542 is an industrial high-speed semiconductor fuse designed to protect sensitive power electronic components against damaging short-circuit currents. Manufactured by Mersen, a recognised specialist in electrical protection, this fuse is suitable for equipment containing semiconductor devices such as diodes, thyristors, rectifiers and insulated-gate bipolar transistors (IGBTs).
High-speed fuses operate more rapidly than conventional industrial fuses, limiting the amount of fault energy that reaches valuable electronic components. This fast response helps reduce equipment damage, unplanned downtime and costly component replacement in demanding power conversion and automation systems.
The B300542 is intended for professional replacement and maintenance applications where the installed fuse must be matched carefully to the equipment manufacturer's requirements. Its industrial construction makes it suitable for power electronic systems including variable frequency drives, converters, inverters and uninterruptible power supplies.
Semiconductor components can be damaged by fault currents before a standard industrial fuse has time to operate. High-speed fuses such as the Mersen B300542 are engineered to interrupt these currents rapidly, restricting the thermal and electrical stress placed on sensitive electronic devices.
Correct fuse selection is essential for safe and reliable equipment operation. The replacement fuse should match the original manufacturer's current rating, voltage rating, operating class, breaking capacity, dimensions and mounting configuration before installation.
| Current | 11 A |
|---|---|
| Item number | B300542 |
| Catalogue No | PC70UD13C250D1A |
| Description | Square Body High-Speed Fuse Protistor® Size 70 aR 1250VAC IEC 1300VAC UL 250A With Striker DIN 110 Blades |
| EAN/UPC Code | 3605340330007 |
| 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 | 70 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 77000 A²s |
| Melting I2t | 9580 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 | DIN 110 Blades |
| Product Width | 39.8 mm |
| Product Length | 133.4 mm |
| Product Height | 49.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.0899 kg |
| Sell Pack Width | 130 mm |
| Sell Pack Length | 140 mm |
| Sell Pack Height | 50 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.3633 kg |
| Power Dissipation at Rated Current Value | 61 W |
| HS Code | 85351000 |
The Mersen B300542 is used to protect sensitive semiconductor components in industrial power electronic equipment against damaging short-circuit currents.
High-speed semiconductor fuses are commonly used to protect IGBTs, thyristors, power diodes, rectifiers and related electronic components.
A standard industrial fuse should not be substituted unless its electrical characteristics, operating speed, breaking capacity, dimensions and approvals meet the equipment manufacturer's requirements.
It may be installed in variable frequency drives, converters, inverters, UPS equipment, power supplies and other semiconductor-based industrial systems.
Confirm the complete reference, rated current, rated voltage, fuse class, breaking capacity, physical dimensions and mounting arrangement against the existing fuse or equipment documentation.
Mersen high-speed fuses are used by electrical engineers and maintenance professionals to protect sensitive power electronic components in industrial automation, power conversion and energy systems.
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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...