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 6,9 URD 31 TT F 0630 6,9URD31TTF0630
High-speed semiconductor protection fuse with aR characteristic, 630A rating, 690VAC IEC and 700VAC UL rated voltage, ceramic body, striker indication, and bolted mounting.
£104.89
Why Choose the Mersen W300008 Protistor® Fuse?
The Mersen W300008 is a high-performance Protistor® ultra-fast semiconductor fuse engineered to provide exceptional protection for sensitive power electronic equipment. Designed for demanding industrial applications, this square body fuse delivers rapid fault interruption to safeguard semiconductor devices such as IGBTs, diodes, SCRs and inverter systems.
Manufactured by Mersen, a global leader in electrical protection solutions, the W300008 offers outstanding reliability, high breaking capacity and excellent current limiting performance. Its robust construction helps minimise equipment damage during short-circuit conditions while maximising system uptime and operational safety.
With a 630 A current rating, 690 V AC operating voltage and aR protection characteristic, the W300008 is ideally suited for protecting variable speed drives, UPS systems, industrial converters, motor drives and renewable energy power conversion equipment.
Key Advantages
- Ultra-fast Protistor® semiconductor protection fuse.
- 630 A current rating for demanding industrial applications.
- 690 V AC rated voltage for modern power systems.
- aR characteristic provides protection for semiconductor devices.
- High interrupting capacity for enhanced equipment safety.
- Reduces damage caused by short circuits and fault currents.
- Designed for industrial drives, converters and power electronics.
Key Features
- Manufacturer: Mersen
- Series: Protistor®
- Model: W300008 (PC31UD69V630TF)
- Square body semiconductor fuse.
- 630 A rated current.
- 690 V AC rated voltage.
- aR ultra-fast protection class.
- High-speed fault interruption.
- Suitable for protecting power semiconductor devices.
- Requires compatible fuse holder.
- Industrial-grade construction for demanding environments.
Reliable Protection for Power Electronics
Semiconductor fuses are specifically designed to protect high-value electronic power components by interrupting fault currents before excessive thermal energy can damage sensitive devices. Their ultra-fast operating characteristics help extend equipment life and reduce costly downtime.
The Mersen Protistor® range is widely trusted throughout industrial automation, renewable energy, transportation and power conversion industries where reliable semiconductor protection is essential for maintaining safe and efficient operation.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- Power converters.
- UPS systems.
- Renewable energy inverters.
- Soft starters.
- Industrial power supplies.
- Semiconductor protection circuits.
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 | W300008 | |
| Catalogue No | PC31UD69V630TF | |
| Description | Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 700VAC UL 630A With Striker Flush ends metric threads | |
| EAN/UPC Code | 3605340322323 | |
| Rated voltage AC UL | 700 V | |
| Rated voltage AC IEC | 690 V | |
| Ampere Rating | 630 A | |
| RoHS Compliant | Yes | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | 31 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 430000 A²s | |
| Melting I2t | 75000 A²s | |
| AC Max I.R./Breaking Capacity | I1: 200 kA | |
| Indication System | Yes | |
| Indication System Type | Striker | |
| Connection/Terminal Material | Silver-Plated Brass | |
| Connection/Terminal Type | Flush ends | |
| Product Width | 51 mm | |
| Product Length | 50.6 mm | |
| Product Height | 56.5 mm | |
| Sell Pack Quantity | 3 EA | |
| Sell Pack Weight | 1.1478 kg | |
| Sell Pack Width | 85 mm | |
| Sell Pack Length | 168 mm | |
| Sell Pack Height | 65 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 0.3826 kg | |
| Power Dissipation at Rated Current Value | 75 W | |
| HS Code | 85361090 | |
| Country of Manufacture | France |
Frequently Asked Questions
What is the Mersen W300008 used for?
It protects semiconductor devices including IGBTs, SCRs, diodes and other sensitive power electronic components against high fault currents.
What is the current rating of the W300008?
The fuse has a 630 A rated current.
What voltage is the fuse designed for?
The W300008 is rated for operation on systems up to 690 V AC.
What does the aR fuse characteristic mean?
The aR characteristic provides ultra-fast short-circuit protection specifically for semiconductor devices while allowing normal operating currents to pass.
Where is this fuse commonly installed?
It is commonly installed in industrial drives, converters, UPS equipment, renewable energy systems and other power electronic installations using an appropriate fuse holder.
Trusted by Industrial Engineers Worldwide
Mersen Protistor® semiconductor fuses are trusted across industrial automation and power electronics applications for their fast response, dependable protection and long-term reliability in critical electrical systems.
