Engineered for reliable protection of sensitive power semiconductor devices, the Square Body High-Speed Fuse Protistor® Size 32 delivers rapid response to overloads and faults in industrial and commercial applications. With a 450A rating, it supports systems up to 690VAC (IEC) and 700VAC (UL), ensuring enhanced circuit safety and minimal downtime.
£151.63
The Mersen N300461, catalogue number A070UD32TTI450, is a Protistor® Size 32 square body high-speed semiconductor protection fuse engineered to provide advanced short-circuit protection for sensitive power electronic equipment. With an ultra-fast aR operating characteristic, it is specifically designed to protect IGBTs, thyristors, diodes and other semiconductor devices used in industrial power conversion systems.
Rated at 450 A with a 690 V AC IEC / 700 V AC UL voltage rating, the N300461 combines high interrupting capacity with low let-through energy to minimise semiconductor damage during fault conditions. The fuse features flush-end UNC threaded terminals with an integrated striker indicator, providing reliable operation in demanding industrial applications.
Designed for maximum equipment reliability, the Mersen N300461 is ideally suited for variable speed drives, UPS systems, industrial converters, renewable energy equipment and motor control installations where rapid semiconductor protection is essential.
Protistor® semiconductor fuses are specifically engineered to interrupt high fault currents before excessive thermal energy can damage expensive semiconductor devices. Their extremely fast response and low energy let-through help maximise equipment reliability while reducing maintenance costs and unplanned downtime.
The Mersen N300461 is widely specified by OEMs, machine builders and maintenance engineers for protecting variable speed drives, industrial inverters, UPS systems and other power conversion equipment requiring dependable semiconductor protection.
| Item number | N300461 |
|---|---|
| Catalogue No | A070UD32TTI450 |
| Description | Square Body High-Speed Fuse Protistor® Size 32 aR 690VAC IEC 700VAC UL 450A With Striker Flush ends UNC threads |
| EAN/UPC Code | 3605340328813 |
| Rated voltage AC UL | 700 V |
| Rated voltage AC IEC | 690 V |
| Ampere Rating | 450 A |
| RoHS Compliant | Yes |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 32 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 130 kA²s |
| Melting I2t | 22 kA²s |
| AC Max I.R./Breaking Capacity | I1: 200 kA |
| Design Details | Standard Terminal |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Brass |
| Connection/Terminal Type | Flush ends |
| Product Width | 59 mm |
| Product Length | 50.6 mm |
| Product Height | 65 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.8099 kg |
| Sell Pack Width | 145 mm |
| Sell Pack Length | 245 mm |
| Sell Pack Height | 90 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.6033 kg |
| Power Dissipation at Rated Current Value | 77 W |
| HS Code | 85361090 |
| Country of Manufacture | France |
The Mersen N300461 protects semiconductor devices including IGBTs, thyristors, SCRs and diodes against damaging short-circuit faults in industrial power electronic equipment.
The fuse has a continuous current rating of 450 A.
It is rated for 690 V AC (IEC) and 700 V AC (UL).
Yes. The fuse incorporates an integrated striker indicator that can be used with compatible microswitch accessories for remote indication.
The aR characteristic identifies an ultra-fast semiconductor protection fuse designed specifically for short-circuit protection of sensitive power electronic devices.
Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs, machine builders and industrial maintenance engineers for protecting critical power electronic equipment with fast, reliable fault interruption.
● 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...