Why Choose the Mersen A4BQ350 Class L Time-Delay Fuse?
The Mersen A4BQ350 is a high-performance Class L time-delay fuse engineered to provide exceptional overcurrent and short circuit protection for high-capacity industrial electrical systems. Part of the renowned Amp-Trap 2000® A4BQ series, this fuse is designed to safeguard service entrance equipment, switchgear, distribution panels and heavy-duty motor circuits while minimising nuisance operation during temporary inrush currents.
Featuring Mersen's advanced current-limiting technology, the A4BQ350 helps reduce fault energy and protects downstream electrical equipment from damaging short circuit currents. Its built-in 4-second time-delay characteristic at 500% rated current allows motors, transformers and other inductive loads to start normally without unnecessary fuse operation, improving system reliability and uptime.
Rated at 350 A with a 600 V AC / 500 V DC voltage rating, the A4BQ350 is ideal for industrial power distribution, motor protection and feeder circuit applications requiring dependable circuit protection and compliance with Class L fuse standards.
Key Advantages
- High-performance Class L time-delay fuse for industrial power systems.
- 350 A current rating for high-capacity electrical protection.
- 600 V AC / 500 V DC voltage rating for demanding applications.
- Advanced Amp-Trap 2000® current-limiting technology.
- 4-second time-delay reduces nuisance fuse operation during equipment start-up.
- Provides excellent protection for switchgear, feeders and service entrance equipment.
Key Features
- Mersen Amp-Trap 2000® A4BQ series.
- 350 A ampere rating.
- 600 V AC / 500 V DC rated voltage.
- Class L time-delay fuse.
- Current-limiting design for reduced let-through energy.
- Blade mounting configuration.
- 50 / 60 Hz operation.
- Suitable for service entrance, feeder and branch circuit protection.
Reliable Protection for Industrial Power Distribution
The Mersen A4BQ350 is designed to protect industrial electrical installations from damaging overloads and high fault currents while allowing temporary inrush currents associated with motors, transformers and other inductive equipment. Its current-limiting design significantly reduces thermal and mechanical stress on downstream components during fault conditions.
As part of the trusted Amp-Trap 2000® family, the A4BQ350 delivers dependable performance in critical power distribution systems, helping improve equipment protection, minimise downtime and support long-term electrical system reliability.
Typical Applications
- Service entrance equipment.
- Industrial switchboards and switchgear.
- Motor control centres.
- Distribution and feeder circuits.
- Heavy industrial machinery.
- Commercial and industrial electrical installations.
