High-speed Square Body Protistor® fuse engineered for semiconductor protection with 400A rating, 1250VAC IEC and 1300VAC UL voltage, integrated striker and DIN 110 blades for reliable status indication and panel integration.
£183.62
The Mersen S300557 is a manufacturer-specific industrial electrical replacement component intended for professional maintenance, repair and equipment-support applications. Identified by the exact Mersen reference S300557, it helps engineers, maintenance teams and purchasing departments source the corresponding component for compatible industrial electrical equipment.
Accurate part-number matching is essential when maintaining machinery, control panels and power distribution systems. Selecting the specified Mersen component helps reduce the risk of unsuitable substitutions while supporting the fit, compatibility and continued reliability of the original equipment installation.
The Mersen S300557 should be selected by comparing its manufacturer reference, physical configuration and electrical characteristics with the original component or associated equipment documentation. Detailed technical ratings are not readily available through publicly accessible product information, so all specifications and installation requirements should be verified using the product markings or current Mersen technical documentation.
Industrial electrical systems depend on correctly identified replacement components to maintain safe and dependable operation. Using the precise manufacturer reference helps maintenance personnel avoid unsuitable alternatives that could affect equipment fit, electrical compatibility or overall system performance.
The Mersen S300557 provides a distinct reference for product identification during procurement, servicing and planned maintenance. Before installation, engineers should verify the complete specification against the original part, associated electrical drawings and the latest technical information supplied by Mersen.
| Current | 11 A |
|---|---|
| Item number | S300557 |
| Catalogue No | PC72UD13C400D1A |
| Description | Square Body High-Speed Fuse Protistor® Size 72 aR 1250VAC IEC 1300VAC UL 400A With Striker DIN 110 Blades |
| EAN/UPC Code | 3605340330199 |
| 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 | Bolted |
| 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 | DIN 110 Blades |
| Product Width | 59 mm |
| Product Length | 133.4 mm |
| Product Height | 63 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 2.1099 kg |
| Sell Pack Width | 142 mm |
| Sell Pack Length | 194 mm |
| Sell Pack Height | 72 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.7033 kg |
| Power Dissipation at Rated Current Value | 80 W |
| HS Code | 85351000 |
The Mersen S300557 is a manufacturer-specific industrial electrical component identified by the Mersen part reference S300557.
Yes. S300557 is the reference used to identify this Mersen component for purchasing, maintenance and replacement purposes.
Compare the S300557 reference, physical format and electrical markings with the original component, equipment drawings and current Mersen technical documentation.
Detailed ratings should be taken directly from the product marking or verified using official Mersen documentation before the component is selected or installed.
Installation should be completed by a suitably qualified electrical professional in accordance with the equipment instructions and applicable electrical regulations.
Mersen components support professional electrical maintenance applications where accurate product identification, dependable component selection and equipment reliability are essential.
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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...