Merit Brass A4BY900 Class L Fuse 600V

Product Description

The MERIT BRASS A4BY900 is a Class L fuse rated at 600 volts, designed for high-capacity overcurrent protection in industrial and commercial electrical systems. Class L fuses are current-limiting devices rated 601 amps and above, built to interrupt high fault currents and protect downstream equipment. This fuse is installed by licensed electricians in panelboards, switchgear, and motor control centers where high-ampacity branch circuit or feeder protection is required. The 600-volt rating makes it suitable for standard North American power distribution applications.

Class L fuses are used in heavy commercial and industrial installations where high interrupt ratings and current-limiting performance are critical. Typical applications include motor feeders, transformer primaries, and service entrance equipment. This fuse is suited for facilities with high available fault current where standard fuses would not provide adequate protection.

Key Features

• 600-volt Class L rating for high-capacity overcurrent protection
• Current-limiting design reduces let-through energy during fault events
• Suitable for industrial panelboards, switchgear, and motor control centers
• Designed to meet UL Class L fuse standards for high-ampacity applications

Compatibility

Designed as an OEM-style replacement Class L fuse for use in industrial and commercial electrical distribution equipment rated for 600-volt Class L fuse installations.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC). De-energize and lockout/tagout the circuit before removing or installing any fuse. Verify the fuse holder or fusible disconnect is rated for Class L fuses at 600 volts before installation. Never install a fuse with a higher ampere rating than the circuit or equipment is designed to handle.

Technical Specifications

• Voltage Rating: 600 volts
• Fuse Class: Class L
• UPC: 78200193913

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: A4BY900