High-speed fuse with aR characteristic, rated 250A, 1250VAC IEC and 1300VAC UL, featuring striker indication and flush-end UNC threaded terminals for bolted mounting.
£137.35
The Mersen D301027 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 D301027 manufacturer reference is specified.
Industrial fuses help interrupt excessive fault currents before damaging levels of electrical and thermal energy reach conductors, electronic components or connected machinery. When correctly selected and installed, the Mersen D301027 supports effective fault isolation, improved equipment reliability and reduced operational downtime.
The electrical ratings and physical configuration of the D301027 should be verified against the original fuse, equipment documentation or official Mersen technical data before installation. Important selection criteria include rated current, rated voltage, operating class, breaking capacity, time-current characteristic, terminal arrangement and dimensions.
Electrical fuses operate by opening a circuit when current exceeds defined operating limits. This helps prevent excessive heating, conductor damage and failure of connected electrical or electronic components during a fault condition.
Correct fuse selection is essential for safe and dependable operation. Rated current, voltage, utilisation category, time-current characteristic, breaking capacity and physical format must correspond with the protected equipment. The Mersen D301027 should only be fitted where this exact reference or a formally approved equivalent is specified.
| Item number | D301027 |
|---|---|
| Catalogue No | A130UD71TTI250 |
| Description | Square Body High-Speed Fuse Protistor® Size 71 aR 1250VAC IEC 1300VAC UL 250A With Striker Flush ends UNC threads |
| EAN/UPC Code | 3605340335613 |
| Rated voltage AC UL | 1300 V |
| Rated voltage AC IEC | 1250 V |
| Ampere Rating | 250 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 71 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 72 kA²s |
| Melting I2t | 8.9 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 | 1.5 kg |
| Sell Pack Width | 85 mm |
| Sell Pack Length | 170 mm |
| Sell Pack Height | 70 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.5 kg |
| Power Dissipation at Rated Current Value | 61 W |
| HS Code | 85351000 |
The Mersen D301027 is used to provide electrical circuit protection within compatible industrial power, control and electronic equipment.
It can be used where the equipment or original component specifies Mersen D301027. All electrical and mechanical specifications should be checked before installation.
Confirm 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.
An alternative fuse should only be used when approved by the equipment manufacturer and when every required electrical, performance and dimensional specification matches.
Mersen fuses are used by electrical engineers, equipment manufacturers and maintenance professionals to provide dependable protection for 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...