High-speed aR characteristic fuse designed for semiconductor protection with a 630A rating, striker indication, and plain blade terminals, suitable for industrial AC applications up to 1300VAC.
£288.50
The Mersen D300843 is an industrial electrical fuse designed to provide dependable protection for 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 D300843 manufacturer reference is specified.
Industrial fuses help interrupt excessive fault currents before they can cause serious thermal or electrical damage to conductors, semiconductor devices and connected machinery. When correctly selected and installed, the Mersen D300843 supports effective fault isolation, improved equipment reliability and reduced operational downtime.
The electrical and mechanical characteristics of the D300843 should be verified against the original component or official equipment documentation before installation. Important selection criteria include the rated current, rated voltage, fuse operating class, breaking capacity, time-current characteristic, terminal arrangement and physical dimensions.
Electrical fuses operate by opening a circuit when current exceeds defined operating limits. This helps prevent excessive heating, conductor damage and the failure of connected electrical or electronic components during a fault condition.
Correct fuse selection is essential for safe and dependable operation. The rated current, voltage, utilisation category, time-current characteristic, breaking capacity and physical format must correspond with the requirements of the protected equipment. The Mersen D300843 should only be fitted where this exact reference or a formally approved equivalent is specified.
| Item number | D300843 |
|---|---|
| Catalogue No | PC73UD13C630PA |
| Description | Square Body High-Speed Fuse Protistor® Size 73 aR 1250VAC IEC 1300VAC UL 630A With Striker Plain Blades |
| EAN/UPC Code | 3605340334388 |
| Rated voltage AC UL | 1300 V |
| Rated voltage AC IEC | 1250 V |
| Ampere Rating | 630 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 73 |
| Mounting | Clip |
| Clearing I2t At Rated Voltage | 680 kA²s |
| Melting I2t | 84 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 | Plain Blades |
| Product Width | 73 mm |
| Product Length | 149.4 mm |
| Product Height | 78.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 3.48 kg |
| Sell Pack Width | 160 mm |
| Sell Pack Length | 245 mm |
| Sell Pack Height | 100 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 1.16 kg |
| Power Dissipation at Rated Current Value | 132 W |
| HS Code | 85351000 |
The Mersen D300843 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 D300843. 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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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...