High-speed aR fuse with integrated striker indication, suitable for semiconductor protection in industrial applications rated at 630A, 690VAC (IEC), and 700VAC (UL).
£194.11
The Mersen D300705 is an industrial electrical fuse designed to provide dependable circuit protection within compatible power distribution, control and power electronic equipment. Manufactured by Mersen, a recognised specialist in electrical protection, it is suitable for maintenance, repair and replacement applications where the exact D300705 manufacturer reference is specified.
Industrial fuses interrupt electrical faults before excessive current can cause serious damage to cables, electronic components and connected machinery. When correctly selected and installed, the Mersen D300705 helps improve equipment safety, reduce the risk of secondary damage and minimise costly operational downtime.
The D300705 is suitable for use in compatible control panels, industrial machinery and electrical assemblies. Before installation, its current rating, voltage rating, operating class, breaking capacity, dimensions and terminal configuration should be verified against the original fuse or the equipment manufacturer’s documentation.
Electrical fuses operate by opening a circuit when current exceeds defined limits. This rapid isolation helps prevent excessive heat, conductor damage and the failure of connected components during an electrical fault.
Correct fuse selection is essential for safe operation. The rated current, voltage, utilisation category, time-current characteristic, breaking capacity and physical design must all correspond with the requirements of the protected equipment. The Mersen D300705 should only be installed where this exact reference or a fully approved equivalent is specified.
| Item number | D300705 |
|---|---|
| Catalogue No | A070UD31LI630 |
| Description | Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 700VAC UL 630A With Striker Slotted Blades long |
| EAN/UPC Code | 3605340332476 |
| Rated voltage AC UL | 700 V |
| Rated voltage AC IEC | 690 V |
| Ampere Rating | 630 A |
| RoHS Compliant | Yes |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 31 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 430000 A²s |
| Melting I2t | 75000 A²s |
| AC Max I.R./Breaking Capacity | I1: 200 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Copper |
| Connection/Terminal Type | Slotted Blades |
| Product Width | 51 mm |
| Product Length | 148.6 mm |
| Product Height | 56.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.2519 kg |
| Sell Pack Width | 155 mm |
| Sell Pack Length | 165 mm |
| Sell Pack Height | 60 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.4173 kg |
| Power Dissipation at Rated Current Value | 85 W |
| HS Code | 85361090 |
| Country of Manufacture | France |
The Mersen D300705 is used to provide electrical fault protection within compatible industrial control, power distribution and electronic equipment.
It can be used where the equipment manufacturer specifies Mersen D300705. Every electrical and mechanical specification should be checked before installation.
Check the rated current, rated voltage, operating class, breaking capacity, time-current characteristic, dimensions and terminal configuration.
It may be installed in compatible industrial control panels, power distribution assemblies, machinery and power electronic equipment.
A different fuse should only be used when it has been approved by the equipment manufacturer and matches all required electrical, performance and dimensional specifications.
Mersen fuses are widely used by electrical engineers, maintenance professionals and equipment manufacturers to provide dependable circuit protection within critical 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...