High-speed aR characteristic fuse designed for semiconductor protection with rated voltages of 1250VAC (IEC) and 1300VAC (UL), 400A current rating, ceramic body and striker indication system.
£233.09
The Mersen B300841 is an industrial high-speed semiconductor fuse designed to protect sensitive power electronic components against damaging short-circuit currents. Manufactured by Mersen, it is intended for equipment containing semiconductor devices such as IGBTs, thyristors, power diodes and rectifiers that require rapid and dependable fault interruption.
High-speed semiconductor fuses operate more rapidly than conventional industrial fuses, helping to restrict the peak current and electrical energy passing through a circuit during a fault. This fast response can reduce thermal stress on valuable components, minimise equipment damage and improve the operational reliability of industrial power conversion systems.
The B300841 is suitable for professional replacement, maintenance and machine-building applications where the fuse must be matched precisely to the original equipment specification. Before installation, its electrical ratings, physical dimensions and terminal configuration should be confirmed against the existing fuse, equipment documentation or official Mersen technical data.
Power semiconductor devices can be permanently damaged by excessive fault current before a standard industrial fuse has time to operate. The Mersen B300841 is designed to interrupt short-circuit currents rapidly, helping restrict the thermal and electrical stress applied to sensitive electronic components.
Correct fuse selection is essential for safe and dependable equipment operation. Before ordering or installing the B300841, confirm the rated current, voltage, utilisation category, breaking capacity, dimensions, terminal configuration and applicable approvals against the original fuse or equipment documentation.
| Item number | B300841 |
|---|---|
| Catalogue No | PC72UD13C400PA |
| Description | Square Body High-Speed Fuse Protistor® Size 72 aR 1250VAC IEC 1300VAC UL 400A With Striker Plain Blades |
| EAN/UPC Code | 3605340334357 |
| Rated voltage AC UL | 1300 V |
| Rated voltage AC IEC | 1250 V |
| Ampere Rating | 400 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 72 |
| Mounting | Clip |
| Clearing I2t At Rated Voltage | 270 kA²s |
| Melting I2t | 32.8 kA²s |
| 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 | 59 mm |
| Product Length | 149.4 mm |
| Product Height | 63 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 2.3298 kg |
| Sell Pack Width | 160 mm |
| Sell Pack Length | 202 mm |
| Sell Pack Height | 80 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.7766 kg |
| Power Dissipation at Rated Current Value | 80 W |
| HS Code | 85351000 |
The Mersen B300841 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 fuse should not be substituted unless its electrical ratings, operating speed, breaking capacity, dimensions and approvals comply fully with the equipment manufacturer’s requirements.
It may be installed in variable frequency drives, converters, inverters, UPS equipment, industrial power supplies and other semiconductor-based systems.
Confirm the complete product reference, current rating, voltage rating, utilisation category, breaking capacity, physical dimensions and terminal arrangement against the existing fuse or equipment documentation.
Mersen high-speed fuses are used by electrical engineers, equipment manufacturers and maintenance professionals to protect sensitive power electronic components in demanding industrial systems.
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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...