Why Choose the Mersen A4BQ700 Class L Time-Delay Fuse?
The Mersen A4BQ700 is a high-performance Class L time-delay fuse designed to provide dependable overcurrent and short-circuit protection for demanding industrial and commercial power distribution systems. Part of the trusted Mersen Amp-Trap 2000® A4BQ series, it is suitable for service entrance equipment, switchgear, feeder circuits and other high-capacity electrical installations.
Mersen states that Amp-Trap 2000® A4BQ fuses offer 20% greater current limitation than other Class L fuses. This enhanced current-limiting performance helps reduce damaging short-circuit let-through current and provides improved protection for downstream conductors, switchgear and connected electrical equipment.
Rated at 700 A, 600 V AC and 500 V DC, the A4BQ700 combines a high interrupting capacity with a built-in 4-second time-delay characteristic at 500% of rated current. This allows harmless temporary inrush currents from motors, transformers and other inductive loads to pass without nuisance fuse operation.
Key Advantages
- Reliable Class L time-delay protection for high-capacity electrical systems.
- 700 A current rating for demanding industrial distribution circuits.
- 600 V AC and 500 V DC voltage ratings.
- Amp-Trap 2000® technology provides enhanced current limitation.
- Time-delay operation accommodates normal equipment start-up currents.
- 200 kA AC interrupting capacity for severe fault protection.
Key Features
- Mersen Amp-Trap 2000® A4BQ series.
- 700 A rated current.
- 600 V AC rated voltage.
- 500 V DC rated voltage.
- Class L current-limiting fuse.
- 4-second time delay at 500% of rated current.
- 200 kA AC maximum interrupting capacity.
- Bolted blade mounting.
- Silver-plated copper terminals.
- Suitable for 50 / 60 Hz electrical systems.
- RoHS compliant.
Advanced Protection for Industrial Power Distribution
The Mersen A4BQ700 limits the peak current and energy passing through a circuit during a short-circuit event. This helps reduce thermal and mechanical stress on downstream components, supporting improved protection of switchboards, conductors, busbars and connected electrical equipment.
Its time-delay characteristic makes the fuse particularly suitable for circuits containing motors, transformers and other inductive equipment. Temporary start-up currents can pass without nuisance opening, while sustained overloads and severe short-circuit faults are interrupted to protect the electrical installation.
Typical Applications
- Service entrance equipment.
- Industrial switchgear and switchboards.
- Main electrical distribution panels.
- High-capacity feeder circuits.
- Motor control centres.
- Transformer protection systems.
- Manufacturing and processing facilities.
- Commercial and industrial power infrastructure.
