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MERSEN FUSE 6,9 URD 33 TT F 0550 W300077
High-speed Protistor® fuse with 550A rating, aR characteristic, and compliance to IEC 690VAC and UL 700VAC standards. Features integrated striker indication and flush ends with metric threads for bolted mounting.
£103.41
Why Choose the Mersen W300077 Protistor® Fuse?
The Mersen W300077 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 protect semiconductor devices including IGBTs, MOSFETs, thyristors and diodes against damaging short-circuit currents.
Manufactured by Mersen, a global leader in electrical protection technology, the W300077 combines outstanding current limiting performance with high breaking capacity to minimise equipment damage and maximise operational reliability. Its robust construction and silver-plated contacts ensure dependable long-term performance in industrial environments.
With a 200 A current rating, 690 V AC IEC / 700 V AC UL voltage rating and an aR ultra-fast protection characteristic, the W300077 is ideally suited for protecting variable speed drives, industrial converters, UPS systems, renewable energy inverters and other power conversion equipment.
Key Advantages
- Ultra-fast Protistor® semiconductor protection fuse.
- 200 A current rating for industrial power electronics.
- 690 V AC IEC / 700 V AC UL rated voltage.
- aR characteristic specifically designed for semiconductor protection.
- High interrupting capacity reduces equipment damage during faults.
- Excellent current limiting performance.
- Suitable for industrial drives, converters and renewable energy systems.
Key Features
- Manufacturer: Mersen
- Series: Protistor® Size 30
- Model: W300077
- Square body high-speed semiconductor fuse.
- 200 A rated current.
- 690 V AC IEC / 700 V AC UL voltage rating.
- aR ultra-fast protection characteristic.
- Integrated striker indicator.
- Flush ends with metric threaded connections.
- Silver-plated contact surfaces.
- Designed for protecting IGBTs, MOSFETs, thyristors and diodes.
Reliable Protection for Industrial Power Electronics
Ultra-fast semiconductor fuses are designed to disconnect fault currents before excessive thermal energy can damage expensive semiconductor devices. Their rapid response improves equipment reliability, reduces maintenance costs and helps minimise production downtime.
The Mersen Protistor® range is widely trusted across industrial automation, renewable energy, transportation and power conversion industries where dependable semiconductor protection is essential for safe and efficient operation.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- Power converters.
- UPS systems.
- Renewable energy inverters.
- Industrial rectifiers.
- Soft starters.
- Semiconductor protection circuits.
Technical Specifications
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| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Class | aR | |
| Voltage | 690 V | |
| Item number | W300077 | |
| Catalogue No | PC33UD69V550TF | |
| Description | Square Body High-Speed Fuse Protistor® Size 33 aR 690VAC IEC 700VAC UL 550A With Striker Flush ends metric threads | |
| EAN/UPC Code | 3605340323139 | |
| Rated voltage AC UL | 700 V | |
| Rated voltage AC IEC | 690 V | |
| Ampere Rating | 550 A | |
| RoHS Compliant | Yes | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | 33 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 155 kA²s | |
| Melting I2t | 27 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 | 73 mm | |
| Product Length | 50.6 mm | |
| Product Height | 78.5 mm | |
| Sell Pack Quantity | 3 EA | |
| Sell Pack Weight | 2.4168 kg | |
| Sell Pack Width | 85 mm | |
| Sell Pack Length | 245 mm | |
| Sell Pack Height | 95 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 0.8056 kg | |
| Power Dissipation at Rated Current Value | 105 W | |
| HS Code | 85361090 |
Frequently Asked Questions
What is the Mersen W300077 used for?
It is designed to protect semiconductor devices including IGBTs, MOSFETs, thyristors and diodes used in industrial power electronic equipment.
What is the current rating of the W300077?
The fuse has a 200 A current rating.
What voltage is the fuse rated for?
The W300077 is rated for 690 V AC (IEC) and 700 V AC (UL) systems.
What does the aR characteristic mean?
The aR characteristic provides ultra-fast short-circuit protection 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 systems, renewable energy equipment and other power electronic installations.
Trusted by Industrial Engineers Worldwide
Mersen Protistor® semiconductor fuses are trusted by engineers and OEM manufacturers worldwide to provide reliable protection for critical power electronic equipment operating in demanding industrial environments.
