Why Choose the Mersen A4BQ5000 Class L Time-Delay Fuse?
The Mersen A4BQ5000 is a high-capacity Class L time-delay fuse engineered to provide dependable overcurrent and short-circuit protection for demanding 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 installations requiring effective current limitation.
The A4BQ5000 is designed to reduce damaging short-circuit let-through current, helping protect downstream conductors, switchgear and connected electrical equipment. Its built-in 4-second time-delay characteristic at 500% of rated current accommodates harmless temporary inrush currents from motors, transformers and other inductive loads without unnecessary fuse operation.
With a rated current of 5000 A and a 600 V AC voltage rating, the A4BQ5000 is suitable for extremely high-current electrical systems. Its bolted blade construction, silver-plated copper terminals and 200 kA interrupting capacity make it a robust solution for critical power protection applications.
Key Advantages
- Heavy-duty Class L time-delay fuse for high-current power systems.
- 5000 A current rating for major electrical distribution circuits.
- 600 V AC voltage rating for industrial and commercial installations.
- Advanced Amp-Trap 2000® current-limiting technology.
- 4-second time delay helps prevent nuisance opening during equipment start-up.
- 200 kA AC interrupting capacity for severe short-circuit protection.
Key Features
- Mersen Amp-Trap 2000® A4BQ series.
- 5000 A rated current.
- 600 V AC rated voltage.
- Class L time-delay fuse.
- 4-second time delay at 500% of rated current.
- 200 kA AC maximum interrupting capacity.
- Silver-plated copper blade terminals.
- Bolted mounting for secure installation.
- RoHS-compliant construction.
- Suitable for 50 / 60 Hz electrical systems.
Reliable Protection for High-Current Power Distribution
The Mersen A4BQ5000 protects critical electrical infrastructure against sustained overloads and severe short-circuit faults. Its current-limiting design reduces the amount of fault current and energy passing through the circuit, helping minimise thermal and mechanical stress on downstream equipment.
The time-delay characteristic allows normal temporary inrush currents from large motors, transformers and other inductive equipment to pass without nuisance opening. This combination of controlled time-delay performance, high interrupting capacity and effective current limitation makes the A4BQ5000 suitable for demanding electrical distribution systems where reliability and safety are essential.
Typical Applications
- Service entrance equipment.
- Industrial switchgear and switchboards.
- Main electrical distribution systems.
- High-current feeder circuits.
- Large motor control installations.
- Transformer protection systems.
- Heavy industrial and commercial power infrastructure.
