Why Choose the Mersen A4BQ100 Class L Fuse?
The Mersen A4BQ100 is a premium Class L time-delay current-limiting fuse designed to provide outstanding protection for industrial power distribution systems, service entrance equipment and high-current electrical installations. As part of the renowned Mersen Amp-Trap 2000 A4BQ series, it delivers exceptional short-circuit protection while accommodating temporary inrush currents without unnecessary fuse operation.
Rated at 100 A with a maximum operating voltage of 600 V AC and 500 V DC, the A4BQ100 offers high interrupting capacity and advanced current-limiting performance. Its built-in 4-second time-delay characteristic allows harmless motor starting and transformer energisation currents to pass while still providing rapid protection against damaging overloads and short circuits.
The A4BQ100 is widely specified for service entrance protection, feeder circuits, large motors and industrial switchgear where dependable circuit protection and selective coordination are essential. Its rejection-style Class L design helps prevent incorrect fuse replacement, improving safety and system reliability.
Key Advantages
- Industrial Class L time-delay current-limiting fuse.
- 100 A current rating for high-power applications.
- 600 V AC and 500 V DC ratings.
- 200 kA AC interrupting capacity for high fault-current systems.
- Built-in 4-second time-delay helps prevent nuisance operation during inrush currents.
- Rejection-style design helps prevent incorrect fuse substitution.
Key Features
- Mersen Amp-Trap 2000 A4BQ series.
- 100 A rated current.
- 600 V AC maximum voltage.
- 500 V DC maximum voltage.
- Class L time-delay current-limiting design.
- Fast arc-quenching silica filler construction.
- Fibreglass body for dimensional stability.
- Blade terminals for Class L fuse holders.
Reliable Protection for Industrial Power Distribution
The Mersen A4BQ100 combines high interrupting capacity with controlled time-delay characteristics to protect electrical systems while allowing temporary inrush currents associated with motors, transformers and other inductive loads. Its current-limiting performance reduces thermal and mechanical stress on downstream equipment during fault conditions.
Designed for critical industrial installations, the Amp-Trap 2000 A4BQ range provides dependable protection for mains, feeders and service entrance equipment while supporting selective coordination to minimise unnecessary system shutdowns.
Typical Applications
- Service entrance equipment.
- Main distribution switchboards.
- Industrial feeder circuits.
- Large motors and motor control centres.
- Circuit breaker back-up protection.
- UPS DC links and battery disconnect systems.
