Protistor® Size 31 high-speed fuse ensures reliable equipment safety with rapid fault interruption up to 550A. Certified to IEC 690VAC and UL 700VAC standards with integrated striker indication and flush ends UNC threads.
£164.06
The Mersen H300479 is a professional-grade electrical protection component intended for use with compatible industrial power distribution, power conversion and machinery control equipment. Manufactured by Mersen, it is suitable for applications where dependable protection, precise component identification and reliable system operation are essential.
The H300479 manufacturer reference enables engineers, panel builders, maintenance professionals and purchasing teams to identify the required component accurately. Selecting the correct Mersen product helps preserve the electrical and mechanical characteristics specified for the original installation while reducing the risk of compatibility problems caused by unsuitable replacement components.
Before purchasing or installing the Mersen H300479, its rated voltage, rated current, protection category, breaking capacity, terminal arrangement and physical dimensions should be confirmed against the existing component and the latest official Mersen technical documentation. Installation should only proceed when every relevant electrical and mechanical specification matches the intended application.
Correctly selected electrical protection components help limit the effects of short circuits, overcurrents and other abnormal electrical conditions. They can help protect valuable machinery, conductors, control systems and power electronic equipment while reducing the likelihood of unplanned downtime.
The Mersen H300479 should be matched using its complete manufacturer reference and installed by a suitably qualified electrical professional. The operating voltage, current, protection characteristics, breaking capacity, mounting arrangement and environmental conditions must be verified before the equipment is energised.
| Item number | H300479 |
|---|---|
| Catalogue No | A070UD31TTI550 |
| Description | Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 700VAC UL 550A With Striker Flush ends UNC threads |
| EAN/UPC Code | 3605340329087 |
| Rated voltage AC UL | 700 V |
| Rated voltage AC IEC | 690 V |
| Ampere Rating | 550 A |
| RoHS Compliant | Yes |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 31 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 310000 A²s |
| Melting I2t | 52000 A²s |
| AC Max I.R./Breaking Capacity | I1: 200 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 | 50.6 mm |
| Product Height | 56.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.155 kg |
| Sell Pack Width | 85 mm |
| Sell Pack Length | 168 mm |
| Sell Pack Height | 65 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.385 kg |
| Power Dissipation at Rated Current Value | 70 W |
| HS Code | 85361090 |
| Country of Manufacture | France |
The Mersen H300479 is an electrical protection component intended for use with compatible industrial power, machinery and electrical control equipment.
Compare the complete H300479 part number, electrical ratings, protection characteristics, terminal configuration and dimensions with the existing component and official Mersen documentation.
It may be used as a replacement where the original equipment documentation specifies the same Mersen reference and matching electrical and mechanical characteristics.
Confirm the rated voltage, rated current, protection category, breaking capacity, terminal arrangement, dimensions and operating environment before installation.
The component should be selected and installed by a suitably qualified electrical professional in accordance with the equipment instructions and applicable electrical regulations.
Mersen electrical protection products are used by engineers, panel builders, equipment manufacturers and maintenance professionals to support dependable operation in industrial power and control systems.
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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...