High-speed aR fuse designed for semiconductor protection with striker indication and bolted mounting, rated 630A at 1000VAC IEC and 1100VAC UL.
£191.76
The Mersen P300669 is a specialist high-speed semiconductor protection fuse developed for use in demanding industrial power-electronic equipment. As part of Mersen’s established Protistor® range, it is intended to help protect sensitive semiconductor components against damaging short-circuit and overcurrent conditions.
High-speed semiconductor fuses are designed to operate rapidly and limit the thermal and electrical energy transferred to connected equipment during a fault. This makes the P300669 suitable for compatible systems incorporating valuable components such as diodes, thyristors, rectifiers, GTOs and insulated-gate bipolar transistors.
The Mersen P300669 manufacturer reference allows maintenance engineers, panel builders, OEMs and purchasing teams to identify the required replacement component accurately. The fuse’s full current rating, voltage rating, utilisation category, breaking capacity, I²t performance, dimensions and terminal configuration should be checked against the existing component or current Mersen technical documentation before installation.
Power-semiconductor devices can suffer permanent damage within milliseconds when exposed to excessive fault current. Dedicated high-speed fuses are therefore used to interrupt faults rapidly and restrict the energy reaching sensitive electronic components.
The Mersen P300669 is intended to provide dependable protection within compatible motor-control and power-conversion equipment. Correct fuse selection is essential, so the required current rating, voltage rating, breaking capacity, utilisation category, I²t values, dimensions and terminal arrangement must be verified before ordering or installation.
| Item number | P300669 |
|---|---|
| Catalogue No | A110UD71LLI630 |
| Description | Square Body High-Speed Fuse Protistor® Size 71 aR 1000VAC IEC 1100VAC UL 630A With Striker Slotted Blades long |
| EAN/UPC Code | 3605340331882 |
| Rated voltage AC UL | 1100 V |
| Rated voltage AC IEC | 1000 V |
| Ampere Rating | 630 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 71 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 725 kA²s |
| Melting I2t | 126 kA²s |
| AC Max I.R./Breaking Capacity | I1: 167 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 | 157.4 mm |
| Product Height | 56.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.62 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 | 0.54 kg |
| Power Dissipation at Rated Current Value | 120 W |
The P300669 is a high-speed fuse intended to protect compatible semiconductor devices and industrial power-electronic equipment against damaging short-circuit and overcurrent conditions.
High-speed semiconductor fuses are commonly used to protect diodes, thyristors, rectifiers, GTOs and IGBTs within industrial power-conversion equipment.
It may be suitable for compatible variable speed drives when its complete electrical ratings, operating characteristics, dimensions and terminal configuration match the equipment manufacturer’s requirements.
Compare the complete part number, current rating, voltage rating, breaking capacity, utilisation category, I²t values, dimensions and terminal arrangement with the existing fuse and current Mersen documentation.
The fuse should be selected and installed by a suitably qualified electrical engineer or technician in accordance with applicable safety requirements and equipment manufacturer instructions.
Mersen Protistor® fuses are specified by electrical engineers, OEM manufacturers and industrial maintenance teams for dependable high-speed protection of valuable power-electronic equipment.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
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...