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MERSEN FUSE 12,5 URD 70 D11 A 0250 12,5URD70D11A0250
High-speed aR characteristic fuse rated 250A, 1250VAC IEC and 1300VAC UL, with integrated striker indication and DIN 110 blade terminals for semiconductor protection.
£75.52
Why Choose the Mersen B300542 High-Speed Semiconductor Fuse?
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.
Key Advantages
- High-speed semiconductor fuse for power electronic protection.
- Rapid fault interruption helps minimise damaging energy let-through.
- Suitable for protecting IGBTs, thyristors, diodes and rectifiers.
- Industrial construction for dependable operation in demanding equipment.
- Helps reduce component damage and unplanned machine downtime.
- Manufactured by Mersen, a specialist in electrical protection products.
Key Features
- Mersen high-speed fuse technology.
- Manufacturer reference B300542.
- Designed for semiconductor and power electronic circuits.
- Fast-acting response during short-circuit conditions.
- Low energy let-through for improved component protection.
- Suitable for industrial maintenance and replacement requirements.
- Compatible with a range of power conversion applications.
- Designed for installation by qualified electrical professionals.
Reliable Protection for Power Electronics
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.
Typical Applications
- Variable frequency drives and industrial motor controllers.
- Power converters and rectifier systems.
- Industrial inverters and power supplies.
- Uninterruptible power supply equipment.
- Automation and production machinery.
- Semiconductor-based electrical equipment.
Technical Specifications
Tick the specs you need, then view products that match.
| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Class | aR | |
| Voltage | 1250 V | |
| 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 |
Frequently Asked Questions
What is the Mersen B300542 used for?
The Mersen B300542 is used to protect sensitive semiconductor components in industrial power electronic equipment against damaging short-circuit currents.
Which components can this fuse protect?
High-speed semiconductor fuses are commonly used to protect IGBTs, thyristors, power diodes, rectifiers and related electronic components.
Can the B300542 replace a standard industrial fuse?
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.
Where is this fuse commonly installed?
It may be installed in variable frequency drives, converters, inverters, UPS equipment, power supplies and other semiconductor-based industrial systems.
What should be checked before ordering this fuse?
Confirm the complete reference, rated current, rated voltage, fuse class, breaking capacity, physical dimensions and mounting arrangement against the existing fuse or equipment documentation.
Trusted for Industrial Electrical Protection
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.
