Why Choose the Mersen A4BQ150 Class L Fuse?
The Mersen A4BQ150 is a premium Class L time-delay current-limiting fuse engineered to provide superior protection for industrial power distribution systems, service entrance equipment and high-current electrical installations. Part of the renowned Mersen Amp-Trap 2000 A4BQ series, it combines exceptional current-limiting performance with a controlled time-delay characteristic to protect critical equipment while accommodating temporary inrush currents.
Rated at 150 A, 600 V AC and 500 V DC, the A4BQ150 rapidly interrupts damaging fault currents while minimising peak let-through current and energy. Its integrated 4-second time-delay characteristic at 500% of rated current allows normal motor starting and transformer energisation currents to pass without nuisance operation while maintaining rapid protection against sustained overloads and short circuits.
Designed for demanding industrial applications, the A4BQ150 is widely used in service entrance equipment, switchboards, feeder circuits and motor control centres. Its rejection-style Class L design helps prevent incorrect fuse replacement, improving both safety and system reliability.
Key Advantages
- Industrial Class L time-delay current-limiting fuse.
- 150 A current rating for industrial power distribution.
- 600 V AC and 500 V DC voltage ratings.
- 300 kA AC interrupting capability under UL witnessed testing.
- Built-in 4-second time delay helps prevent nuisance operation during equipment start-up.
- Current-limiting construction reduces damaging fault energy.
Key Features
- Mersen Amp-Trap 2000 A4BQ series.
- 150 A rated current.
- 600 V AC maximum voltage.
- 500 V DC maximum voltage.
- Class L rejection-style current-limiting fuse.
- Time-delay characteristic for motors and transformers.
- Fibreglass body with high-grade silica filler.
- Blade terminals for compatible Class L fuse holders.
Reliable Protection for Industrial Power Distribution
The Mersen A4BQ150 provides exceptional protection against overloads and short circuits in industrial electrical systems. Its advanced current-limiting design minimises peak fault current and let-through energy, helping protect switchgear, transformers, cables and downstream electrical equipment from costly damage.
Its built-in time-delay characteristic allows normal inrush currents associated with motors and transformers while maintaining rapid response to sustained overloads and fault conditions. This improves system reliability and supports selective coordination in critical industrial installations.
Typical Applications
- Service entrance equipment.
- Industrial switchboards.
- Main feeder circuits.
- Motor control centres.
- Transformer protection.
- Heavy industrial power distribution systems.
