Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
MERSEN FUSE A 120 URD 70 LI 0350 E300660
High-speed fuse delivering reliable circuit protection for high-power semiconductor applications up to 350A at 1100VAC (IEC) and 1200VAC (UL) with striker indication and slotted blade terminals.
£86.02
Why Choose the Mersen E300660 Protistor® High-Speed Fuse?
The Mersen E300660, catalogue number A120UD70LI350, is a premium square body high-speed semiconductor fuse engineered to provide ultra-fast protection for high-voltage power electronic equipment. Part of the renowned Mersen Protistor® Size 70 series, this fuse is specifically designed to protect IGBTs, thyristors, GTOs, diodes and other semiconductor devices against damaging short-circuit currents. Featuring long slotted blade terminals with an integrated striker indicator, it offers dependable protection for demanding industrial applications.
Manufactured using precision die-cut pure silver fuse elements embedded in solidified silica sand, together with silver-plated contact surfaces and non-magnetic hardware, the E300660 delivers exceptionally low let-through energy (I²t) and excellent current-limiting performance. This advanced construction helps minimise semiconductor damage while improving equipment reliability and reducing costly downtime.
With a 350 A current rating, 1100 V AC IEC rating and 1200 V AC UL rating, the Mersen E300660 is ideally suited for renewable energy systems, variable frequency drives, UPS installations, industrial power converters and heavy-duty automation equipment requiring dependable semiconductor protection.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 350 A current rating for high-power industrial applications.
- 1100 V AC IEC / 1200 V AC UL voltage rating.
- Protects IGBTs, thyristors, GTOs and diode modules.
- Low I²t characteristics minimise semiconductor damage.
- Long slotted blade terminals for secure bolted installation.
Key Features
- Mersen Protistor® Size 70 series.
- 350 A rated current.
- 1100 V AC IEC / 1200 V AC UL rated voltage.
- aR ultra-fast operating characteristic.
- Long slotted blade terminals.
- Integrated striker indicator for remote fuse monitoring.
- 150 kA AC breaking capacity.
- Silver-plated contacts with non-magnetic hardware.
- RoHS compliant.
Reliable Protection for High-Voltage Power Electronics
High-speed semiconductor fuses are engineered to interrupt fault currents before sensitive power semiconductors can be damaged. The Mersen Protistor® Size 70 range delivers rapid fault interruption with low I²t values, making it ideal for protecting modern power conversion systems while improving operational reliability and reducing maintenance costs.
The E300660 is widely used in renewable energy installations, industrial motor drives, power converters, UPS systems, battery energy storage systems (BESS) and industrial automation equipment where reliable semiconductor protection is essential.
Typical Applications
- Variable frequency drives (VFDs).
- Renewable energy inverter systems.
- Battery energy storage systems (BESS).
- Industrial power converters and rectifiers.
- UPS and standby power systems.
- Industrial automation and OEM machinery.
Technical Specifications
Tick the specs you need, then view products that match.
| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Class | aR | |
| Voltage | 1100 V | |
| Item number | E300660 | |
| Catalogue No | A120UD70LI350 | |
| Description | Square Body High-Speed Fuse Protistor® Size 70 aR 1100VAC IEC 1200VAC UL 350A With Striker Slotted Blades long | |
| EAN/UPC Code | 3605340331790 | |
| 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 | Slotted Blades | |
| Product Width | 39.8 mm | |
| Product Length | 152.4 mm | |
| Product Height | 49.5 mm | |
| Sell Pack Quantity | 3 EA | |
| Sell Pack Weight | 1.1298 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 | 0.3766 kg | |
| Power Dissipation at Rated Current Value | 75 W | |
| HS Code | 85351000 |
Frequently Asked Questions
What is the Mersen E300660 used for?
The E300660 provides ultra-fast protection for semiconductor devices including IGBTs, GTOs, thyristors and diodes used in high-voltage power conversion equipment.
What is the current rating of this fuse?
The Mersen E300660 has a 350 A rated current.
What voltage is the fuse designed for?
It is rated for 1100 V AC (IEC) and 1200 V AC (UL) applications.
What type of terminals does this fuse use?
The fuse features long slotted blade terminals with an integrated striker indicator for secure installation and convenient remote monitoring.
Where is this fuse commonly installed?
It is commonly installed in industrial drives, renewable energy systems, power converters, UPS systems and other high-voltage power electronic installations.
Trusted for Semiconductor Protection Worldwide
Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs, panel builders and industrial engineers to deliver dependable protection for critical power electronic equipment operating in demanding industrial environments.
