High-speed aR fuse rated at 350A for semiconductor protection with flush striker ends and metric thread terminals, suitable for industrial power applications up to 1300VAC.
£186.59
The Mersen K300504 is an industrial high-speed semiconductor fuse intended to protect sensitive power electronic components against damaging short-circuit currents. It is suitable for consideration in systems containing devices such as IGBTs, thyristors and power diodes, where rapid fault interruption and low let-through energy are essential.
High-speed semiconductor fuses operate more rapidly than conventional industrial fuses. When correctly selected, they limit peak fault current and the I²t energy transferred to connected components, helping reduce thermal stress, prevent extensive equipment damage and minimise unplanned production downtime.
The K300504 may be used in industrial drives, converters, rectifiers, uninterruptible power supplies and other power electronic equipment. Publicly accessible manufacturer information for this exact reference could not be reliably verified, so its current rating, voltage rating, operating class, breaking capacity, terminal arrangement and dimensions must be confirmed against the product label or official Mersen documentation before specification or installation.
Power semiconductor devices can be permanently damaged by fault energy before a standard circuit-protection device has time to operate. High-speed semiconductor fuses are engineered to interrupt short-circuit currents rapidly, limiting both peak current and the total energy experienced by the protected components.
Correct fuse selection must consider system voltage, continuous and cyclic current, prospective short-circuit current, ambient temperature, cooling conditions, terminal arrangement and the withstand characteristics of the semiconductor module. A replacement fuse should never be selected solely because it has similar physical dimensions.
| Item number | K300504 |
|---|---|
| Catalogue No | PC73UD13C350TF |
| Description | Square Body High-Speed Fuse Protistor® Size 73 aR 1250VAC IEC 1300VAC UL 350A With Striker Flush ends metric threads |
| EAN/UPC Code | 3605340329445 |
| Rated voltage AC UL | 1300 V |
| Rated voltage AC IEC | 1250 V |
| Ampere Rating | 350 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 73 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 140 kA²s |
| Melting I2t | 17 kA²s |
| AC Max I.R./Breaking Capacity | I1: 126 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Brass |
| Connection/Terminal Type | Flush ends |
| Product Width | 73 mm |
| Product Length | 74 mm |
| Product Height | 78.5 mm |
| Sell Pack Quantity | 1 EA |
| Sell Pack Weight | 1.22 kg |
| Sell Pack Width | 110 mm |
| Sell Pack Length | 125 mm |
| Sell Pack Height | 75 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 1.22 kg |
| Power Dissipation at Rated Current Value | 86 W |
| HS Code | 85351000 |
The Mersen K300504 is intended to provide high-speed fault protection for sensitive semiconductor components used in industrial power electronic equipment.
A correctly selected high-speed fuse can protect components such as IGBT modules, thyristors and power diodes against damaging short-circuit energy.
The current rating for this exact reference could not be reliably verified from publicly accessible manufacturer information. Check the fuse label or official Mersen datasheet before specifying a replacement.
Not necessarily. The voltage rating, current rating, operating class, breaking capacity, I²t characteristics and terminal arrangement must all meet the equipment requirements.
Compare the complete manufacturer reference and all electrical and mechanical specifications with the original fuse and the equipment manufacturer's protection requirements.
Mersen high-speed fuses are used in industrial power electronic systems where rapid fault interruption and effective coordination with sensitive semiconductor components are essential.
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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...