Why Choose the Mersen A4BQ750 Class L Time-Delay Fuse?
The Mersen A4BQ750 is a premium Class L time-delay fuse engineered to provide exceptional overcurrent and short-circuit protection for industrial and commercial power distribution systems. As part of the trusted Mersen Amp-Trap 2000® A4BQ series, it is designed for service entrance equipment, switchgear, feeder circuits and other critical electrical installations requiring maximum reliability and current limitation.
Amp-Trap 2000® A4BQ fuses provide up to 20% greater current limitation than conventional Class L fuses, helping minimise short-circuit let-through current and energy. Their built-in 4-second time-delay characteristic at 500% of rated current accommodates temporary inrush currents from motors, transformers and other inductive loads without nuisance operation.
With a rated current of 750 A, voltage ratings of 600 V AC and 500 V DC, and an industry-leading interrupting capability, the A4BQ750 delivers dependable protection for demanding industrial power systems while helping reduce equipment damage during fault conditions.
Key Advantages
- High-performance Class L time-delay fuse for industrial power distribution.
- 750 A current rating for high-capacity electrical systems.
- 600 V AC / 500 V DC voltage ratings.
- Amp-Trap 2000® technology provides up to 20% greater current limitation.
- 4-second time delay prevents nuisance operation during motor and transformer start-up.
- 300 kA AC interrupting rating with excellent current limitation.
Key Features
- Mersen Amp-Trap 2000® A4BQ series.
- 750 A ampere rating.
- 600 V AC / 500 V DC rated voltage.
- Class L current-limiting time-delay fuse.
- 4-second minimum time delay at 500% rated current.
- 300 kA AC interrupting rating (UL witnessed).
- 100 kA DC interrupting rating.
- Bolted blade terminals.
- Fibreglass body with high-grade silica filler.
- Suitable for 50 / 60 Hz electrical systems.
- RoHS compliant.
Reliable Protection for Industrial Power Systems
The Mersen A4BQ750 is engineered to protect electrical distribution systems from damaging overloads and severe short-circuit faults. Its advanced current-limiting construction reduces peak let-through current and energy, helping protect switchgear, conductors, busbars and downstream equipment from excessive thermal and mechanical stress.
Its integrated time-delay characteristic allows temporary motor and transformer inrush currents to pass without nuisance operation while maintaining dependable protection against sustained overloads and fault currents. This combination makes the A4BQ750 ideal for demanding industrial environments where reliability and uptime are essential.
Typical Applications
- Service entrance equipment.
- Industrial switchgear and switchboards.
- Main electrical distribution systems.
- Feeder circuit protection.
- Motor control centres.
- Transformer protection.
- Commercial and industrial facilities.
- Circuit breaker back-up protection.
