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MERSEN FUSE L TD FUSE 600V 650A A4BQ A4BQ650
Reliable, time-delay circuit protection fuse with 650A rating for AC/DC applications, featuring Class L blade design and high interrupting capacity.
£738.01
Why Choose the Mersen A4BQ650 Class L Time-Delay Fuse?
The Mersen A4BQ650 is a premium Class L time-delay fuse designed to provide superior overcurrent and short-circuit protection for industrial and commercial power distribution systems. As part of the trusted Amp-Trap 2000® A4BQ series, it offers industry-leading current limitation and dependable protection for service entrance equipment, switchgear, feeder circuits and other critical electrical installations.
Featuring advanced Amp-Trap 2000® technology, the A4BQ650 delivers up to 20% greater current limitation than conventional Class L fuses, reducing damaging fault energy reaching downstream equipment. Its integrated 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 650 A current rating and voltage ratings of 600 V AC and 500 V DC, the A4BQ650 is engineered for demanding electrical distribution systems requiring exceptional fault protection, high interrupting capacity and long-term reliability.
Key Advantages
- High-performance Class L time-delay fuse for industrial power distribution.
- 650 A current rating for high-capacity electrical systems.
- 600 V AC / 500 V DC voltage ratings.
- Advanced Amp-Trap 2000® current-limiting technology.
- 4-second time-delay minimises 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.
- 650 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.
- Blade terminals with bolted mounting.
- Fibreglass body with high-grade silica filler.
- Suitable for 50 / 60 Hz electrical systems.
Reliable Protection for Industrial Power Systems
The Mersen A4BQ650 is designed to minimise damage caused by overloads and severe short-circuit faults. Its advanced current-limiting construction significantly reduces peak let-through current and energy, helping protect switchgear, conductors and downstream equipment from thermal and mechanical stress.
Its time-delay operating characteristic allows temporary motor and transformer inrush currents to pass without nuisance opening while maintaining dependable protection against sustained overloads and fault currents. This makes the A4BQ650 ideal for demanding industrial installations where uptime and equipment protection are critical.
Typical Applications
- Service entrance equipment.
- Industrial switchgear and switchboards.
- Main electrical distribution systems.
- Feeder circuit protection.
- Motor control centres.
- Transformer protection.
- Heavy industrial and commercial facilities.
Technical Specifications
Tick the specs you need, then view products that match.
| Current | 650 A | |
|---|---|---|
| Voltage | 600 V | |
| Fuse Type | UL class | |
| Fuse Class | Time delay | |
| Item number | A4BQ650 | |
| Description | Fuse A4BQ - Class L - Time-Delay 600VAC 500VDC 650A Blade Amp-Trap 2000® | |
| EAN/UPC Code | 782001930011 | |
| Rated voltage AC UL | 600 V | |
| Rated voltage DC UL | 500 V | |
| Frequency (Hz) | 50/60 Hz | |
| Ampere Rating | 650 A | |
| AC or DC | AC/DC | |
| Fuse Class | Class L | |
| Speed/Characteristic | Time Delay | |
| Mounting | Bolted | |
| AC Max I.R./Breaking Capacity | I1: 200 kA | |
| Connection/Terminal Material | Silver-Plated Copper | |
| Connection/Terminal Type | Blade | |
| Product Diameter | 50.8 mm | |
| Product Length | 219.2 mm | |
| Sell Pack Quantity | 1 EA | |
| Sell Pack Weight | 1.7962 kg | |
| Sell Pack Width | 63.5 mm | |
| Sell Pack Length | 222.2 mm | |
| Sell Pack Height | 60.5 mm | |
| Product group | Low Voltage UL/CSA Fuses | |
| Body/Insulating Material | GMG | |
| Product Weight | 1.71 kg | |
| HS Code | 85361090 | |
| Country of Manufacture | Mexico |
Frequently Asked Questions
What is the Mersen A4BQ650 used for?
The A4BQ650 provides overcurrent and short-circuit protection for service entrance equipment, switchgear, feeder circuits and industrial power distribution systems.
What is the current rating of the A4BQ650?
The fuse has a rated current of 650 A.
What voltage ratings does the A4BQ650 support?
The fuse is rated for 600 V AC and 500 V DC.
What is the interrupting capacity of the A4BQ650?
The fuse provides a 300 kA AC interrupting rating and a 100 kA DC interrupting rating.
Why does the A4BQ650 include a time-delay characteristic?
The built-in 4-second time delay allows temporary motor and transformer inrush currents to pass without nuisance operation while maintaining excellent fault protection.
Trusted for Industrial Circuit Protection
Mersen Amp-Trap 2000® Class L fuses are trusted by electrical engineers, OEMs and industrial facilities worldwide for delivering exceptional current limitation, high interrupting performance and dependable protection of critical power distribution systems.
