High-speed fuse for reliable protection of power semiconductors in industrial applications, rated 250A at 690VAC IEC with striker indication and DIN 80 blade terminals.
£87.77
The Mersen J330242, catalogue number DN00UB69V250L, is a Protistor® NH size 00 square body high-speed semiconductor fuse designed to provide ultra-fast protection for sensitive power semiconductor devices. Featuring an aR operating characteristic, this fuse offers exceptional short-circuit protection for diodes, thyristors, GTOs and IGBTs used in industrial power conversion equipment. It is manufactured with DIN 80 blade contacts and an integrated striker indicator for rapid fault indication.
Rated at 250 A and 690 V AC (IEC), the J330242 delivers excellent current-limiting performance with low let-through energy (I²t), helping to minimise damage to expensive semiconductor components during fault conditions. Pure silver fuse elements embedded in solidified silica sand, together with silver-plated contacts, provide reliable protection and a high interrupting capacity of 200 kA.
The J330242 is ideal for industrial drives, UPS systems, rectifiers, inverters, renewable energy installations and other demanding power conversion applications where dependable semiconductor protection is essential.
Protistor® aR semiconductor fuses are engineered to interrupt fault currents before excessive thermal energy reaches sensitive semiconductor devices. Their low I²t characteristics help maximise equipment reliability while reducing maintenance costs and costly downtime.
The J330242 is suitable for converters, motor drives, UPS systems, renewable energy equipment and industrial automation systems requiring dependable high-speed semiconductor protection.
| Item number | J330242 |
|---|---|
| Catalogue No | DN00UB69V250L |
| Description | Square Body High-Speed Fuse Protistor® Size NH 00 aR 690VAC IEC 250A With Striker DIN 80 Blades |
| EAN/UPC Code | 3605340363821 |
| Rated voltage AC UL | 690 V |
| Rated voltage DC UL | 450 V |
| Rated voltage AC IEC | 690 V |
| Ampere Rating | 250 A |
| RoHS Compliant | Yes |
| AC or DC | AC/DC |
| Speed/Characteristic | aR |
| Fuse Size | NH00 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 42500 A²s |
| Melting I2t | 8300 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 | DIN 80 Blades |
| Product Width | 20 mm |
| Product Length | 100 mm |
| Product Height | 55.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 0.6078 kg |
| Sell Pack Width | 100 mm |
| Sell Pack Length | 110 mm |
| Sell Pack Height | 80 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.2026 kg |
| Power Dissipation at Rated Current Value | 50 W |
| HS Code | 85361090 |
| Country of Manufacture | Tunisia |
The J330242 protects power semiconductor devices including IGBTs, thyristors, GTOs and diodes used in industrial power conversion equipment.
The fuse has a rated current of 250 A.
The fuse is rated for 690 V AC (IEC) and 450 V DC (UL).
Yes. The fuse incorporates an integrated striker indicator that can operate compatible microswitch accessories for remote signalling.
The J330242 is manufactured in the compact NH size 00 square body format with DIN 80 blade contacts.
Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs, panel builders and industrial engineers for protecting high-value power electronic equipment operating in demanding industrial environments.
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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...