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 070 URD 31 LI 0250 A070URD31LI0250
High-speed aR characteristic fuse rated at 690VAC IEC and 700VAC UL with 250A rating, featuring striker indication and slotted blade terminals for reliable semiconductor protection.
£76.93
Why Choose the Mersen W300698 Protistor® High-Speed Fuse?
The Mersen W300698 (A070UD31LI250) is a Protistor® Size 31 high-speed square body semiconductor fuse designed to provide reliable protection for modern power electronic equipment against damaging short-circuit currents. Engineered for demanding industrial applications, it delivers ultra-fast fault interruption and excellent current limitation to help protect valuable semiconductor devices.
Manufactured with precision die-cut fuse elements embedded in solidified sand, the W300698 offers low let-through energy (I²t), high interrupting capacity and dependable operation. Silver-plated contact surfaces and non-magnetic hardware provide excellent electrical performance and long service life in harsh industrial environments.
The W300698 is designed specifically for protecting IGBTs, thyristors, diodes and other semiconductor devices used within industrial drives, converters, UPS systems and power conversion equipment where rapid fault clearance is essential.
Key Advantages
- Ultra-fast aR semiconductor protection.
- Protects IGBTs, thyristors and power semiconductor modules.
- Low I²t design minimises damaging fault energy.
- High breaking capacity for demanding industrial applications.
- Integrated striker indicator for fuse monitoring.
- Manufactured by Mersen for critical power electronic systems.
Key Features
- Mersen Protistor® Size 31 square body fuse.
- Manufacturer reference W300698.
- Catalogue number A070UD31LI250.
- aR ultra-fast semiconductor protection.
- Long slotted blade (LI) terminals.
- Integrated striker indicator.
- Silver-plated contact surfaces.
- Low let-through energy for semiconductor protection.
Designed for Modern Power Electronics
The W300698 has been engineered to provide maximum flexibility in equipment design while delivering reliable protection for today's power conversion equipment. Its ultra-fast operating characteristic limits thermal and electrical stress before semiconductor devices can be damaged, helping maximise equipment uptime and reduce maintenance costs.
Its compact ceramic square body, silver-plated terminals and integrated striker indicator make it suitable for both OEM installations and replacement applications where dependable semiconductor protection is essential.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- Power converters.
- Rectifier systems.
- UPS equipment.
- Renewable energy converters.
- Industrial inverters.
- Power semiconductor protection.
Technical Specifications
Tick the specs you need, then view products that match.
| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Class | aR | |
| Voltage | 690 V | |
| Item number | W300698 | |
| Catalogue No | A070UD31LI250 | |
| Description | Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 700VAC UL 250A With Striker Slotted Blades long | |
| EAN/UPC Code | 3605340332407 | |
| Rated voltage AC UL | 700 V | |
| Rated voltage AC IEC | 690 V | |
| Ampere Rating | 250 A | |
| RoHS Compliant | Yes | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | 31 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 28000 A²s | |
| Melting I2t | 4700 A²s | |
| 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 | 51 mm | |
| Product Length | 148.6 mm | |
| Product Height | 56.5 mm | |
| Sell Pack Quantity | 3 EA | |
| Sell Pack Weight | 1.2519 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 | 0.4173 kg | |
| Power Dissipation at Rated Current Value | 52 W | |
| HS Code | 85361090 | |
| Country of Manufacture | France |
Frequently Asked Questions
What is the Mersen W300698 used for?
The W300698 is a Protistor® high-speed semiconductor fuse designed to protect IGBTs, thyristors, diodes and other semiconductor devices from damaging short-circuit faults.
What are the electrical ratings of the W300698?
The fuse is rated at 250 A with a rated voltage of 690 VAC (IEC) and 700 VAC (UL), featuring an ultra-fast aR characteristic and a 200 kA AC breaking capacity.
What mounting style does the W300698 use?
The fuse is supplied with long slotted blade (LI) terminals and an integrated striker indicator for fuse status monitoring.
Which applications commonly use the W300698?
Typical applications include industrial drives, power converters, UPS systems, rectifiers, inverters and other semiconductor-based power conversion equipment.
Can the W300698 replace another fuse?
Replacement should only be carried out with a fuse having identical electrical ratings, body size, mounting style and semiconductor protection characteristics.
Trusted Semiconductor Protection
Mersen Protistor® high-speed semiconductor fuses are trusted worldwide for protecting critical power electronic equipment through rapid fault interruption, low let-through energy and outstanding reliability.
