High-speed fuse delivering reliable protection for power semiconductors with rapid response up to 550A, certified to IEC and UL standards, featuring integrated striker indication and silver-plated copper slotted blade terminals.
£245.10
The Mersen M300529, catalogue number A070UD30LI550, is a premium Protistor® square body high speed semiconductor fuse designed to provide ultra-fast protection for modern power electronic equipment. Specifically engineered for semiconductor applications, it safeguards IGBTs, MOSFETs, thyristors and diodes against damaging short circuit faults in demanding industrial environments.
With a 550 A current rating, 690 V AC IEC / 700 V AC UL voltage rating and an aR operating class, the M300529 delivers rapid fault interruption while limiting let-through energy to protect valuable semiconductor components. Its robust square body construction and high breaking capacity make it ideal for industrial power conversion systems.
The fuse features a Size 30 square body design with long slotted blade terminals and an integrated striker indicator, enabling straightforward installation into compatible fuse holders and remote monitoring systems used throughout industrial electrical installations.
High speed semiconductor fuses are designed to interrupt fault currents before they can damage costly semiconductor devices. Their ultra-fast operating characteristics reduce thermal and mechanical stress while improving equipment reliability and reducing maintenance costs.
The Mersen M300529 is widely used in industrial automation, power conversion and motor control applications where dependable semiconductor protection is essential for safe, efficient operation.
| Item number | M300529 |
|---|---|
| Catalogue No | A070UD30LI550 |
| Description | Square Body High-Speed Fuse Protistor® Size 30 aR 690VAC IEC 700VAC UL 550A With Striker Slotted Blades long |
| EAN/UPC Code | 3605340329810 |
| 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 | 30 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 330 kA²s |
| Melting I2t | 52 kA²s |
| 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 | 40 mm |
| Product Length | 148.6 mm |
| Product Height | 48 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 0.9639 kg |
| Sell Pack Width | 133 mm |
| Sell Pack Length | 157 mm |
| Sell Pack Height | 54 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.3213 kg |
| Power Dissipation at Rated Current Value | 90 W |
| HS Code | 85361090 |
| Country of Manufacture | France |
The M300529 is an ultra-fast semiconductor fuse designed to protect IGBTs, MOSFETs, thyristors and diodes against damaging short circuit faults.
The fuse has a 550 A rated current.
The fuse is rated for 690 V AC (IEC) and 700 V AC (UL) applications.
The aR classification provides ultra-fast short circuit protection specifically for semiconductor devices while overload protection is provided elsewhere within the electrical system.
The M300529 is commonly installed in industrial drives, power converters, UPS systems, renewable energy equipment and OEM electrical panels.
Mersen Protistor® semiconductor fuses are trusted worldwide by electrical engineers, OEM manufacturers and panel builders to provide dependable protection for critical industrial power electronic equipment.
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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...