Why Choose the Mersen A4BQ3800 Class L Time-Delay Fuse?
The Mersen A4BQ3800 is a high-capacity Class L time-delay fuse designed to provide reliable overcurrent and short-circuit protection for demanding industrial and commercial power distribution systems. As part of the advanced Mersen Amp-Trap 2000® A4BQ series, it offers exceptional current-limiting performance for service entrance equipment, switchgear, feeder circuits and other critical electrical installations.
The A4BQ3800 is engineered to limit damaging short-circuit let-through current, helping protect downstream cables, conductors and electrical equipment. Mersen states that Amp-Trap 2000 A4BQ fuses are 20% more current limiting than other Class L fuses, providing an enhanced level of protection when correctly coordinated within an electrical distribution system.
With a rated current of 3800 A and an operating voltage of 600 V AC, this fuse is suitable for very high-current applications. Its built-in 4-second time-delay characteristic at 500% of rated current accommodates harmless motor, transformer and equipment inrush currents without unnecessary fuse operation.
Key Advantages
- Heavy-duty Class L fuse designed for high-current applications.
- 3800 A current rating for large industrial power systems.
- 600 V AC voltage rating suitable for commercial and industrial installations.
- Advanced Amp-Trap 2000® current-limiting technology.
- Built-in time delay helps prevent nuisance operation during temporary inrush currents.
- 200 kA AC interrupting rating for effective short-circuit protection.
Key Features
- Mersen Amp-Trap 2000® A4BQ series.
- 3800 A rated current.
- 600 V AC rated voltage.
- Class L time-delay characteristic.
- 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 Electrical Systems
The Mersen A4BQ3800 helps protect electrical installations against overloads and severe short-circuit currents. Its current-limiting design reduces the amount of fault current and energy that can pass through the circuit, helping minimise thermal and mechanical stress on downstream equipment.
The time-delay characteristic allows temporary inrush currents from transformers, motors and other inductive equipment to pass without nuisance opening. This combination of high interrupting capacity, current limitation and controlled time-delay performance makes the A4BQ3800 suitable for critical power distribution applications where reliability and equipment protection are essential.
Typical Applications
- Service entrance equipment.
- Industrial switchgear and switchboards.
- Main electrical distribution panels.
- High-current feeder circuits.
- Large motor and transformer installations.
- Manufacturing and processing facilities.
- Commercial and industrial power infrastructure.
