High-speed Protistor® fuse with striker indication, designed for semiconductor protection up to 1400A, rated 690VAC IEC and 700VAC UL, with DIN 80 blade terminals.
£312.45
The Mersen R300257 is a genuine Mersen industrial electrical component identified by its precise manufacturer reference. It is intended for professional maintenance, repair and replacement requirements where the original equipment documentation or installed component specifies part number R300257.
Mersen is an established manufacturer of electrical protection, power management and industrial safety products. Selecting a component with the correct manufacturer reference helps engineers, panel builders and maintenance teams reduce compatibility risks while supporting dependable equipment operation.
The exact electrical ratings, dimensions, connection arrangement and mounting requirements of the R300257 should be verified against current Mersen technical documentation before purchase or installation. The complete markings on the existing component should also be checked to confirm that the replacement matches the required application.
Industrial electrical equipment often requires replacement components to match an exact manufacturer reference. Correct part-number matching helps ensure that the selected product has the appropriate electrical characteristics, physical dimensions, terminal arrangement and mounting configuration for the intended equipment.
Before installing the Mersen R300257, engineers should compare the complete markings on the original component with the equipment manual, electrical schematics and current manufacturer information. Voltage, current, connection method, mounting arrangement and system compatibility must all be verified before commissioning.
| Current | 08 A |
|---|---|
| Item number | R300257 |
| Catalogue No | PC33UD69V1400A |
| Description | Square Body High-Speed Fuse Protistor® Size 33 aR 690VAC IEC 700VAC UL 1400A With Striker DIN 80 Blades |
| EAN/UPC Code | 3605340325874 |
| Rated voltage AC UL | 700 V |
| Rated voltage AC IEC | 690 V |
| Ampere Rating | 1400 A |
| RoHS Compliant | Yes |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 33 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 2700 kA²s |
| Melting I2t | 465 kA²s |
| AC Max I.R./Breaking Capacity | I1: 200 kA |
| Design Details | Reinforced Terminal |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Copper |
| Connection/Terminal Type | DIN 80 Blades |
| Product Width | 73 mm |
| Product Length | 110 mm |
| Product Height | 78.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 2.4369 kg |
| Sell Pack Width | 145 mm |
| Sell Pack Length | 250 mm |
| Sell Pack Height | 90 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.8123 kg |
| Power Dissipation at Rated Current Value | 200 W |
| HS Code | 85361090 |
The R300257 is a Mersen industrial electrical component identified by its manufacturer-specific reference. Its exact product type and technical ratings should be confirmed using current Mersen documentation.
Compare the complete part number and product markings with the installed component, equipment manual, electrical drawings and current Mersen technical information.
A component with a different reference should only be used when its electrical ratings, physical dimensions, terminals and manufacturer-approved compatibility have been fully verified.
Installation should be completed by a suitably qualified electrical engineer or technician following the applicable isolation, inspection and electrical safety procedures.
The R300257 may be used in industrial machinery, electrical panels, power equipment and maintenance applications where this exact Mersen reference is specified.
Mersen products are used by engineers, equipment manufacturers, panel builders and maintenance professionals to support dependable electrical protection, power management and industrial system operation.
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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...