A4BY650 - 650Amp Fuse Description
A4BY650 - 650Amp Fuse
Protect your electrical systems with confidence using the Mersen A4BY650 Amp-Trap® Class L Time-Delay Fuse. Rated at 650 amps, this fuse is perfect for service entrance equipment, feeder circuits, and circuit breakers. Its smart time-delay design lets harmless surges—like motor startups or short voltage spikes—pass without tripping, but acts instantly when a real overcurrent occurs. That means your equipment stays safe, downtime is minimized, and your operations keep running smoothly.
Installation is quick and easy thanks to silver-plated copper blade terminals and a bolt-mounted design. Plus, clear markings make identification and replacement straightforward, saving time and reducing maintenance headaches.
Key Features and Benefits
- Time-delay design prevents unnecessary trips from harmless surges
- 650A rating for medium to high-current circuits
- Rated for 600VAC / 300VDC applications
- 200kA AC interrupting capacity for fast fault protection
- Continuous-duty operation at full amp rating
- Easy-to-read markings simplify maintenance
- Bolt-mounted installation ensures secure and stable fit
Technical Specifications
- Catalog Number: A4BY650
- Series: A4BY – Class L – Time-Delay
- Fuse Class: Class L
- Ampere Rating: 650A
- Voltage Rating: 600VAC / 300VDC
- Frequency: 50/60 Hz
- Speed/Characteristic: Time-Delay
- Mounting: Bolted
- Connection Type: Blade
- Connection Material: Silver-Plated Copper
- AC Max Interrupting Rating: 200kA
- Body Material: GMG (Glass Melamine)
- Product Diameter: 50.8 mm
- Product Length: 219.2 mm
- Product Weight: 1.6511 kg
Material Compliance and Certifications
- RoHS Compliant
- UL/CSA approved for low-voltage applications
- Meets industry standards for industrial and commercial circuit protection
Where It Works Best
- The A4BY650 is perfect for applications where reliable surge tolerance and fast fault response are crucial:
- Service entrance panels
- Feeder circuits and distribution systems
- Industrial machinery protection
- Commercial power systems
- Critical circuit breakers in essential infrastructure
- With its time-delay performance, secure blade terminals, and strong interrupting capacity, the Mersen A4BY650 keeps your electrical systems safe, efficient, and running without a hitch—ideal for both commercial and industrial setups.
Use of Original Equipment Manufacturer (OEM) trademarks, names, and logos is for informational and identification purposes only. This does not imply any affiliation, sponsorship, endorsement, or approval by the original equipment manufacturer. CIRCUIT BREAKER SUPERSTORE® is an independent reseller and is not an authorized distributor, affiliate, or representative of any manufacturer. Manufacturer warranties do not apply unless expressly stated. All trademarks and registered trademarks are the property of their respective owners.
Mersen® is a registered trademark of Mersen S.A. Products sold are surplus, used, or refurbished and are NOT supplied by Mersen S.A. or its affiliates.
Specifications
- Width:2.0
- Depth:2.0
- Height:8.625
- Amperes:650
- A.I.C. Rating & Volts:200 kA @ 600 V.AC
- Type:A4BY
- Additional Notes:Knife-Blade Style, Non-Indicating, Time-Delay, current-limiting Class L Fuse
Returns are easy
You may return unused items within 30 days of delivery for a full refund.
FREE shipping on breaker orders over $100 and all other items with orders over $500.
CIRCUIT BREAKER SUPERSTORE® offers one to five day delivery in the United States. The variation depends on the chosen shipping speed and the warehouse location for the product(s).
Same Day Shipping
We strive to ship out your items within one business day.
In rare circumstances, CIRCUIT BREAKER SUPERSTORE® may reserve up to 5 business days to complete shipment. Feel free to contact us if your order is time sensitive.
CIRCUIT BREAKER SUPERSTORE® provides a limited 1-year warranty on both new and reconditioned products. Rest assured, all products are authentic OEM (original equipment manufacturer).