Why Choose the Mersen A4BQ6000 Class L Time-Delay Fuse?
The Mersen A4BQ6000 is a heavy-duty Class L time-delay fuse engineered to provide dependable overcurrent and short-circuit protection for the largest industrial and commercial power distribution systems. As part of the proven Mersen Amp-Trap 2000® A4BQ series, it is designed for service entrance equipment, switchgear, feeder circuits and other critical high-current applications requiring exceptional current-limiting performance.
The A4BQ6000 incorporates advanced Amp-Trap 2000® current-limiting technology, delivering up to 20% greater current limitation than conventional Class L fuses. Its integrated 4-second time-delay characteristic at 500% of rated current accommodates temporary inrush currents from motors, transformers and other inductive loads without nuisance operation while maintaining outstanding fault protection.
Rated at 6000 A with a 600 V AC voltage rating, the A4BQ6000 is suitable for the most demanding power distribution installations. Its high interrupting capacity, robust bolted blade construction and reliable operating characteristics make it an excellent choice for protecting critical electrical infrastructure.
Key Advantages
- Heavy-duty Class L time-delay fuse for very high-current electrical systems.
- 6000 A current rating for critical power distribution applications.
- 600 V AC and 500 V DC voltage ratings.
- Advanced Amp-Trap 2000® current-limiting technology.
- 4-second time-delay reduces nuisance operation during motor and transformer start-up.
- 200 kA AC interrupting capacity for outstanding fault protection.
Key Features
- Mersen Amp-Trap 2000® A4BQ series.
- 6000 A ampere rating.
- 600 V AC / 500 V DC rated voltage.
- Class L time-delay fuse.
- Current-limiting design reduces let-through current and energy.
- 4-second minimum time delay at 500% rated current.
- 200 kA AC / 100 kA DC interrupting rating.
- Bolted silver-plated copper blade terminals.
- RoHS compliant construction.
- Suitable for 50 / 60 Hz electrical systems.
Reliable Protection for Critical Power Distribution
The Mersen A4BQ6000 is engineered to protect large electrical distribution systems from damaging overloads and severe short-circuit faults. Its advanced current-limiting construction significantly reduces fault energy reaching downstream equipment, helping minimise thermal and mechanical stress on switchgear, busbars and connected electrical assets.
Its built-in time-delay characteristic permits temporary motor and transformer inrush currents while maintaining dependable protection against sustained overloads and fault currents. This makes the A4BQ6000 ideal for mission-critical industrial installations where electrical reliability, safety and equipment protection are essential.
Typical Applications
- Service entrance equipment.
- Industrial switchgear and switchboards.
- Main power distribution systems.
- High-current feeder circuits.
- Large motor control centres.
- Transformer protection.
- Utility and heavy industrial electrical installations.
