Merit Brass A4J225 Class J Fuse 225A 600V

Product Description

The MERIT BRASS A4J225 is a Class J current-limiting fuse rated for 225 amps at 600 volts AC. Class J fuses are recognized for their high interrupting capacity and compact form factor, making them a reliable overcurrent protection device in commercial and industrial electrical distribution systems. The A4J225 provides fast-acting, current-limiting protection that helps safeguard downstream equipment including motors, drives, and transformers from the damaging effects of short-circuit and overload conditions. Licensed electricians typically specify Class J fuses in panelboards, fusible disconnects, and motor control centers where NEC-compliant overcurrent protection is required.

This fuse is suited for use in 600-volt AC electrical systems in light commercial, commercial, and industrial environments. Typical applications include motor branch circuits, feeder circuits, and equipment protection in manufacturing, mechanical rooms, and utility spaces. The A4J225 installs in standard Class J fuse holders and fusible disconnect switches designed for 600-volt service.

Key Features

• 225-amp continuous current rating for heavy-duty branch and feeder circuit protection
• 600-volt AC rating covers the full range of standard commercial distribution voltages
• Class J form factor fits standard Class J fuse holders and disconnects
• Current-limiting design reduces let-through energy to protect downstream components
• Single fuse per pack for straightforward replacement or spare inventory

Compatibility

Designed as a Class J replacement fuse compatible with standard Class J fuse holders and fusible disconnect switches rated for 225 amps at 600 volts AC.

Installation Notes

Installation and replacement of this fuse should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. Always de-energize and lock out the circuit at the disconnect before removing or installing any fuse. Verify that the fuse holder or disconnect is rated for Class J fuses at 600 volts and 225 amps before installation. Never replace a fuse with a unit of a higher ampere rating than the circuit is designed for.

Technical Specifications

• Ampere Rating: 225 amps
• Voltage Rating: 600 volts AC
• Fuse Class: Class J
• Dimensions (L x W x H): 7.250 inches x 2.120 inches x 2.120 inches
• Weight: 1.84 pounds
• Quantity per Pack: 1
• UPC: 78200196038

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: A4J225