Why Choose the Mersen A4BQ1400 Class L Fuse?
The Mersen A4BQ1400 is a high-capacity Class L time-delay current-limiting fuse designed to protect industrial power distribution systems, service entrance equipment and heavy-duty electrical installations against overloads and short circuits. As part of the established Mersen Amp-Trap 2000 A4BQ series, it combines advanced current limitation with controlled time-delay performance for dependable protection in demanding applications.
Rated at 1400 A, 600 V AC and 500 V DC, the A4BQ1400 is engineered for systems carrying substantial load currents and exposed to high prospective fault levels. Its current-limiting construction reduces peak let-through current and fault energy, helping protect switchgear, conductors, busbars, transformers and connected equipment from severe thermal and mechanical stress.
The fuse incorporates a time-delay characteristic that accommodates temporary motor starting currents, transformer energisation and other normal electrical inrush conditions. This helps prevent unnecessary fuse operation while maintaining rapid interruption of dangerous short-circuit currents. Its Class L rejection-style construction supports secure installation and helps prevent replacement with an unsuitable fuse type.
Key Advantages
- Heavy-duty Class L time-delay current-limiting fuse.
- 1400 A current rating for high-capacity electrical systems.
- 600 V AC and 500 V DC voltage ratings.
- High interrupting capacity for demanding fault-current environments.
- Time-delay operation accommodates temporary equipment inrush currents.
- Current-limiting performance reduces damaging fault energy.
Key Features
- Mersen Amp-Trap 2000 A4BQ series.
- 1400 A rated current.
- 600 V AC maximum voltage rating.
- 500 V DC maximum voltage rating.
- Class L rejection-style fuse construction.
- Time-delay characteristic for motors, transformers and inductive loads.
- Current-limiting protection for high available fault currents.
- Bolted-blade terminals for secure industrial installation.
Reliable Protection for High-Power Distribution Systems
The Mersen A4BQ1400 interrupts excessive fault currents before they can reach their maximum prospective value. By reducing peak current and let-through energy, the fuse helps limit damage to switchboards, cables, busbars and other critical electrical distribution components.
Its time-delay performance allows normal temporary surges associated with motors, transformers and inductive equipment to pass without nuisance operation. This makes the A4BQ1400 suitable for industrial systems where reliable protection, selective coordination and operational continuity are important.
Typical Applications
- Industrial switchboards and distribution panels.
- Service entrance equipment and main feeder circuits.
- Motor control centres and high-current motor circuits.
- Transformer primary and secondary protection.
- Industrial disconnect switches.
- UPS systems, battery circuits and compatible DC equipment.
