Why Choose the Mersen A4BQ4000 Class L Time-Delay Fuse?
The Mersen A4BQ4000 is a heavy-duty Class L time-delay fuse designed to provide outstanding overcurrent and short-circuit protection for high-capacity industrial and commercial electrical distribution systems. As part of the trusted Mersen Amp-Trap 2000® A4BQ series, it is specifically engineered for service entrance equipment, switchgear, feeder circuits and other critical power distribution applications requiring dependable fault protection and superior current-limiting performance.
Featuring advanced Amp-Trap 2000® current-limiting technology, the A4BQ4000 significantly reduces damaging fault energy while protecting downstream equipment against high short-circuit currents. Its integrated 4-second time-delay characteristic at 500% of rated current allows temporary motor and transformer inrush currents without nuisance operation, helping maximise system reliability and uptime.
With a rated current of 4000 A and a 600 V AC voltage rating, the A4BQ4000 is ideally suited for demanding industrial power systems where high interrupting capacity and dependable protection are essential.
Key Advantages
- Heavy-duty Class L time-delay fuse for industrial power distribution.
- 4000 A current rating for very high-capacity electrical systems.
- 600 V AC rated voltage for demanding industrial applications.
- Advanced Amp-Trap 2000® current-limiting technology.
- 4-second time-delay reduces nuisance operation during motor and transformer start-up.
- 200 kA AC interrupting rating provides exceptional fault protection.
Key Features
- Mersen Amp-Trap 2000® A4BQ series.
- 4000 A ampere rating.
- 600 V AC voltage rating.
- Class L time-delay fuse.
- Current-limiting design reduces let-through current.
- 4-second minimum time delay at 500% rated current.
- Blade mounting configuration.
- Suitable for service entrance, feeder and main distribution protection.
Reliable Protection for High-Current Power Distribution
The Mersen A4BQ4000 protects electrical distribution systems from damaging overloads and severe short-circuit currents while allowing temporary inrush currents associated with large motors, transformers and other inductive equipment. Its current-limiting construction reduces thermal and mechanical stress on downstream electrical components, helping improve equipment longevity and operational safety.
As part of the proven Amp-Trap 2000® family, the A4BQ4000 delivers dependable protection in demanding industrial environments where high interrupting capacity, reliability and electrical system continuity are essential.
Typical Applications
- Service entrance equipment.
- Industrial switchgear and switchboards.
- Main power distribution systems.
- High-current feeder circuits.
- Large motor control centres.
- Heavy industrial and utility electrical installations.
