The Protistor® 17×27 aR fuse-link offers robust protection for semiconductor devices, featuring fast-acting response and a reliable breaking capacity at 250V AC. It is UL certified and designed to British Standard dimensions with a 12A rating.
£12.98
The Mersen P076649 is a compact Protistor® high-speed semiconductor fuse-link designed to protect sensitive power electronic components against damaging short-circuit currents. Manufactured in a British Standard format, it delivers rapid fault interruption and effective current limitation for industrial control, conversion and automation equipment.
Featuring an aR partial-range operating characteristic, the P076649 is specifically engineered for the protection of power semiconductors. Its fast response helps restrict peak fault current and let-through energy, reducing electrical, thermal and mechanical stress on components such as diodes, thyristors, rectifiers and IGBTs.
With a rated current of 12 A, an IEC and UL AC voltage rating of 250 V and a UL DC voltage rating of 300 V, the Mersen P076649 is suitable for power supplies, compact drives, converters, inverters and industrial control systems. Its 17 × 27 mm ceramic body and copper L-bracket terminals provide a durable, space-efficient solution for bolted installation.
The Mersen P076649 is engineered to interrupt dangerous fault currents before excessive energy can reach sensitive semiconductor devices. Its low melting and clearing I²t values help limit the energy released during a short circuit, reducing the likelihood of damage to power modules and associated equipment.
As an aR-class fuse, the P076649 provides partial-range protection specifically against semiconductor short-circuit currents. Appropriate supplementary overload protection should be incorporated where complete protection against both overload and short-circuit conditions is required.
| Item number | P076649 |
|---|---|
| Catalogue No | BS17US25V12 |
| Description | British Standard fuse-link Protistor® 17x27 aR 250V AC UL 12A |
| EAN/UPC Code | 3605340019476 |
| Rated voltage AC UL | 250 V |
| Rated voltage DC UL | 300 V |
| Rated voltage AC IEC | 250 V |
| Ampere Rating | 12 A |
| RoHS Compliant | Yes |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 17x27 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 31 A²s |
| Melting I2t | 5.9 A²s |
| Connection/Terminal Material | Copper |
| Connection/Terminal Type | L Brackets |
| Product Diameter | 18.5 mm |
| Product Length | 54.4 mm |
| Sell Pack Quantity | 10 EA |
| Sell Pack Weight | 0.276 kg |
| Sell Pack Width | 68 mm |
| Sell Pack Length | 188 mm |
| Sell Pack Height | 24 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.0276 kg |
| Power Dissipation at Rated Current Value | 2 W |
| HS Code | 85361050 |
| Country of Manufacture | India |
The Mersen P076649 provides rapid short-circuit protection for semiconductor devices used in power supplies, drives, converters, rectifiers, inverters and industrial control equipment.
The fuse has a nominal current rating of 12 A.
The P076649 is rated at 250 V AC under IEC and UL standards and 300 V DC under UL ratings.
The aR classification indicates partial-range protection designed specifically to interrupt semiconductor short-circuit currents. Separate overload protection may be required.
No. The P076649 is a non-indicating fuse-link. The striker-equipped 12 A version is available under catalogue number BS17US25V12P.
Mersen Protistor® high-speed fuses are widely specified by OEMs, panel builders and industrial engineers for reliable protection of sensitive semiconductor and power conversion equipment.
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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...