Why Choose the Mersen A4BQ2500 Class L Fuse?
The Mersen A4BQ2500 is a premium Class L time-delay current-limiting fuse engineered for the protection of high-capacity industrial power distribution systems, service entrance equipment and heavy-duty electrical installations. As part of the industry-leading Mersen Amp-Trap 2000 A4BQ series, it delivers outstanding current limitation while accommodating temporary inrush currents from motors and transformers without nuisance operation.
Rated at 2500 A, 600 V AC and 500 V DC, the A4BQ2500 rapidly interrupts high fault currents while significantly reducing peak let-through current and energy. Its advanced current-limiting technology helps protect switchgear, busbars, transformers, cables and other downstream equipment from costly thermal and mechanical damage.
The fuse incorporates a built-in 4-second time-delay characteristic at 500% of rated current, allowing temporary motor starting, transformer energisation and other equipment inrush currents to pass without unnecessary operation. Its rejection-style Class L construction also helps prevent incorrect fuse replacement, improving both safety and system reliability.
Key Advantages
- Heavy-duty Class L time-delay current-limiting fuse.
- 2500 A current rating for high-capacity industrial installations.
- 600 V AC and 500 V DC voltage ratings.
- 200 kA AC interrupting rating (300 kA self-certified, UL witnessed).
- Built-in 4-second time delay minimises nuisance fuse operation.
- Advanced current-limiting technology reduces damaging fault energy.
Key Features
- Mersen Amp-Trap 2000 A4BQ series.
- 2500 A rated current.
- 600 V AC maximum voltage rating.
- 500 V DC maximum voltage rating.
- Class L rejection-style fuse construction.
- 4-second time-delay characteristic.
- Pure silver fuse links for maximum current limitation.
- Silver-plated copper blade terminals with bolted installation.
Reliable Protection for High-Power Distribution Systems
The Mersen A4BQ2500 provides exceptional protection against overloads and short circuits by limiting peak fault current and let-through energy before damage can occur. This helps extend the service life of switchgear, transformers, conductors and other critical electrical infrastructure while improving overall system reliability.
Its integrated time-delay characteristic allows temporary motor and transformer inrush currents to pass normally, making the A4BQ2500 ideal for industrial power distribution systems where dependable protection and selective coordination are essential.
Typical Applications
- Service entrance equipment.
- Industrial switchboards.
- Main distribution and feeder circuits.
- Motor control centres.
- Transformer protection.
- Industrial power distribution systems.
- Circuit breaker back-up protection.
- UPS DC links and battery disconnect applications.
