Why Choose the Mersen A4BQ450 Class L Time-Delay Fuse?
The Mersen A4BQ450 is a premium Class L time-delay fuse designed to provide reliable overcurrent and short-circuit protection for high-capacity industrial and commercial electrical systems. As part of the proven Mersen Amp-Trap 2000® A4BQ series, it delivers superior current-limiting performance for service entrance equipment, switchgear, feeder circuits and other critical power distribution applications.
Featuring advanced Amp-Trap 2000® current-limiting technology, the A4BQ450 helps minimise damaging fault energy while protecting downstream electrical equipment against high short-circuit currents. Its built-in 4-second time-delay characteristic at 500% of rated current allows motors, transformers and other inductive loads to start without nuisance fuse operation, helping maximise system reliability and uptime.
Rated at 450 A with 600 V AC and 500 V DC voltage ratings, the A4BQ450 is ideal for demanding industrial installations requiring dependable circuit protection, high interrupting capacity and compliance with Class L fuse standards.
Key Advantages
- Heavy-duty Class L time-delay fuse for industrial power distribution.
- 450 A current rating for high-capacity electrical systems.
- 600 V AC / 500 V DC voltage ratings.
- Advanced Amp-Trap 2000® current-limiting technology.
- 4-second time delay helps prevent nuisance operation during equipment start-up.
- Provides excellent protection for service entrance equipment, switchgear and feeder circuits.
Key Features
- Mersen Amp-Trap 2000® A4BQ series.
- 450 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.
- Blade terminal construction.
- Suitable for service entrance, feeder and branch circuit protection.
Reliable Protection for Industrial Power Systems
The Mersen A4BQ450 is designed to protect industrial electrical systems from damaging overloads and severe short-circuit currents while allowing temporary inrush currents associated with motors, transformers and other inductive equipment. Its advanced current-limiting design reduces thermal and mechanical stress on downstream electrical components, helping extend equipment life and improve system reliability.
As part of the trusted Amp-Trap 2000® product family, the A4BQ450 is widely specified for industrial and commercial power distribution systems where dependable overcurrent protection and high interrupting performance are essential.
Typical Applications
- Service entrance equipment.
- Industrial switchgear and switchboards.
- Main electrical distribution systems.
- Feeder circuits.
- Motor control centres.
- Transformer protection.
- Commercial and industrial electrical installations.
