Mersen A4BY600 Class L Time-Delay Fuse – 600A – 600VAC/300VDC – Amp-Trap® Blade Fuse

The Mersen A4BY600 is a high-performance Amp-Trap® Class L time-delay fuse designed for industrial, commercial, and utility power distribution systems requiring dependable overcurrent protection. Rated at 600 Amps, this current-limiting fuse provides reliable operation under overload conditions while tolerating motor starting currents and transformer inrush. With voltage ratings of 600VAC and 300VDC, it is well suited for service entrance equipment, feeder circuits, switchgear, and large electrical distribution systems where system reliability and fault protection are critical.

Voltage and Rating

• Current Rating: 600 Amps
• Voltage Rating: 600VAC / 300VDC
• Frequency: 50/60 Hz
• Fuse Class: Class L
• Fuse Type: Time-Delay, Current-Limiting

Key Specifications

• Product Type: Industrial Power Fuse
• Series: Amp-Trap® A4BY
• Part Number: A4BY600
• Manufacturer: Mersen / Ferraz Shawmut
• Mounting Style: Blade
• Time-Delay Capability: Yes (motor and transformer inrush tolerant)
• Current Limiting: Yes

Technical Specifications

• Protection Type: Overcurrent and short-circuit protection
• Application Suitability: Service entrances, feeders, transformers, switchboards, and industrial distribution systems
• Coordination Type: Supports selective coordination with downstream protective devices
• Construction Features: High interrupting capacity, low let-through energy, rugged industrial-grade design
• System Integration: Designed for commercial, industrial, and utility-scale electrical networks

Standards and Approvals

• UL Listed
• CSA Certified
• Compliant with Class L fuse protection requirements

Product Data

• Manufacturer: Mersen / Ferraz Shawmut
• Series: Amp-Trap®
• Part Number: A4BY600
• EAN/UPC: 782001939069

Applications

• Industrial power distribution systems
• Commercial electrical service equipment
• Main service entrance protection
• Feeder circuit protection
• Transformer protection systems
• Switchboards and switchgear assemblies
• Motor control centers
• Critical infrastructure facilities

Returns are easy

You may return items within 30 days of delivery for a refund.

FREE Shipping on orders over $149.

My Circuit Breakers 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, My Circuit Breakers may reserve up to 5 business days to complete shipment. Feel free to contact us if your order is time sensitive.

My Circuit Breakers provides a comprehensive 1-year warranty on both new and reconditioned products. Rest assured, all products are authentic OEM (original equipment manufacturer). Extended warranties are available upon request.