Mersen A4BY601 Class L Fuse 600V

Product Description

The MERSEN A4BY601 is a Class L current-limiting fuse rated for 600 volts, designed for high-ampacity branch circuit and feeder protection in commercial and industrial electrical systems. Class L fuses are used where high fault-current interruption capacity is required in bolted-lug fuseholders. This fuse provides reliable overcurrent protection and is installed by licensed electricians working on switchgear, panelboards, motor control centers, and service entrance equipment where NEC-compliant overcurrent protection is mandatory.

Class L fuses are specified for high-current applications in commercial buildings, industrial facilities, and heavy equipment installations. They are typically found in 600-volt distribution systems where fault currents exceed the ratings of smaller fuse classes. This fuse is suited for service entrance, feeder, and branch circuit protection in systems demanding high interrupting capacity and precise current-limiting performance.

Key Features

• 600-volt rating suitable for full-voltage commercial and industrial distribution systems
• Class L form factor with bolted-lug terminations for high-ampacity fuseholders
• Current-limiting design reduces let-through energy during fault events
• High interrupting capacity for demanding overcurrent protection applications

Compatibility

Designed as an OEM-style replacement or direct-fit fuse for Class L fuseholders rated at 600 volts in commercial and industrial panelboards, switchgear, and motor control centers.

Installation Notes

Installation of Class L fuses must be performed by a qualified, licensed electrician. De-energize and lock out the circuit at the upstream disconnect before servicing the fuseholder, following NFPA 70E arc flash and lockout/tagout procedures. Verify the fuseholder is rated for Class L fuses and matches the voltage and ampere rating of this fuse before installation. Consult NEC Article 240 for overcurrent protection requirements applicable to the installation.

Technical Specifications

• Voltage Rating: 600 volts
• Fuse Class: Class L
• UPC: 78200193907

Standard Information

• Brand: MERSEN
• Manufacturer Part Number: A4BY601