High-speed fuse designed for semiconductor protection with integrated striker indication, rated at 350A, 1100VAC IEC, and 1200VAC UL, featuring DIN 110 blade terminals and ceramic body.
£134.10
The Mersen D300544 is a genuine Protistor® Size 70 square body high-speed semiconductor fuse designed to provide ultra-fast protection for high-power semiconductor devices. This aR class fuse is engineered for protecting diodes, thyristors, GTOs and IGBTs operating on 1100 V AC (IEC) and 1200 V AC (UL) systems. It features a 350 A current rating, integrated striker indicator and DIN 110 blade terminals.
Manufactured by Mersen, Catalogue Number PC70UD11C350D1A, the D300544 forms part of the renowned Protistor® semiconductor protection range. Constructed with pure silver fuse elements embedded in solidified silica sand, silver-plated contact surfaces and non-magnetic hardware, it provides exceptionally low let-through energy and reliable protection for demanding power conversion equipment.
With a 150 kA AC breaking capacity, ceramic square body construction and DIN 110 blade terminals, the D300544 is ideally suited for industrial drives, power converters, renewable energy systems, UPS installations and other high-power electronic equipment requiring dependable semiconductor protection.
Protistor® Size 70 semiconductor fuses are designed to minimise fault energy during overload and short-circuit conditions. Their low I²t characteristics help protect valuable semiconductor devices while reducing equipment downtime and maintenance costs.
The Mersen D300544 combines high interrupting capacity, low power losses and robust ceramic construction to deliver dependable protection for industrial drives, converters, UPS systems and renewable energy installations operating at voltages up to 1200 V AC UL.
| Current | 11 A |
|---|---|
| Item number | D300544 |
| Catalogue No | PC70UD11C350D1A |
| Description | Square Body High-Speed Fuse Protistor® Size 70 aR 1100VAC IEC 1200VAC UL 350A With Striker DIN 110 Blades |
| EAN/UPC Code | 3605340330021 |
| Rated voltage AC UL | 1200 V |
| Rated voltage AC IEC | 1100 V |
| Ampere Rating | 350 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 70 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 180000 A²s |
| Melting I2t | 27800 A²s |
| AC Max I.R./Breaking Capacity | I1: 150 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Copper |
| Connection/Terminal Type | DIN 110 Blades |
| Product Width | 39.8 mm |
| Product Length | 133.4 mm |
| Product Height | 49.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.0899 kg |
| Sell Pack Width | 130 mm |
| Sell Pack Length | 140 mm |
| Sell Pack Height | 50 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.3633 kg |
| Power Dissipation at Rated Current Value | 75 W |
| HS Code | 85351000 |
The D300544 provides ultra-fast protection for semiconductor devices such as IGBTs, thyristors, GTOs and power diodes used in industrial power conversion equipment.
The fuse has a rated current of 350 A.
It is rated for 1100 V AC (IEC) and 1200 V AC (UL) applications.
Yes. It incorporates an integrated striker mechanism for local indication and optional microswitch operation.
The D300544 features DIN 110 blade terminals for bolted installation.
Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs, panel builders and industrial engineers to protect valuable power electronic equipment operating in demanding industrial environments.
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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...