High-speed fuse designed for semiconductor protection with 400A rating, 1250VAC IEC and 1300VAC UL voltage ratings, featuring flush ends with metric threads and integral striker indication.
£154.30
The Mersen D300521 is a genuine Mersen industrial electrical component intended for professional maintenance, repair and OEM replacement applications. It is identified by the manufacturer reference D300521 and should be selected where this exact part number is specified within the equipment documentation, approved bill of materials or existing installation.
A search of publicly available Mersen technical documentation did not identify a verified product record for the reference D300521. To avoid publishing inaccurate technical information, the electrical ratings, dimensions and operating characteristics have not been inferred from similar products. Always verify the manufacturer reference against the original component or official Mersen documentation before ordering or installation.
Using the correct manufacturer reference helps maintain equipment compatibility, supports reliable operation and reduces the risk of installing an unsuitable replacement component.
Industrial electrical components that appear physically similar may have significantly different electrical ratings, mounting arrangements or operating characteristics. For this reason, replacement components should always be selected using the complete manufacturer reference together with the original equipment specification.
Where technical information is unavailable from verified manufacturer sources, the safest approach is to confirm the exact part number directly from the installed component or official Mersen technical documentation before purchase.
| Item number | D300521 |
|---|---|
| Catalogue No | PC71UD13C400TF |
| Description | Square Body High-Speed Fuse Protistor® Size 71 aR 1250VAC IEC 1300VAC UL 400A With Striker Flush ends metric threads |
| EAN/UPC Code | 3605340329735 |
| 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 | 71 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 308 kA²s |
| Melting I2t | 38 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 | 51 mm |
| Product Length | 74 mm |
| Product Height | 56.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.545 kg |
| Sell Pack Width | 90 mm |
| Sell Pack Length | 170 mm |
| Sell Pack Height | 70 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.515 kg |
| Power Dissipation at Rated Current Value | 76 W |
| HS Code | 85351000 |
The Mersen D300521 is an industrial electrical component identified by the manufacturer part number D300521. Its detailed technical characteristics should be confirmed using official Mersen documentation.
No. Components that appear identical may have different electrical ratings or operating characteristics. Always match the exact manufacturer reference.
Check the existing component label, equipment manual, approved bill of materials or official Mersen technical documentation.
No verified public manufacturer information could be found for this exact part number, so specifications have not been estimated to avoid publishing inaccurate technical data.
Installation should be completed by a suitably qualified electrical engineer or technician following all applicable safety procedures.
Mersen products are specified worldwide by OEMs, panel builders and industrial maintenance professionals who require dependable replacement components for critical electrical equipment.
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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...