Ferraz Shawmut A4J6 Class J Fast-acting Fuse 6 Amp

Product Description

The FERRAZ SHAWMUT A4J6 is a Class J fast-acting cylindrical fuse rated at 6 amps, engineered for high-performance electrical circuit protection in demanding commercial and industrial applications. This fuse provides rapid response to overcurrent events, helping protect sensitive downstream equipment from damage. Constructed with a fiberglass and polyester body with a GMG element, the A4J6 is rated for 200 kA interrupting capacity at AC and 100 kA at DC, making it suitable for systems where high fault-current levels are a concern. Licensed electricians and electrical contractors are the primary installers of Class J fuses in panel and equipment protection applications.

The A4J6 is suited for use in commercial and light industrial electrical systems where Class J fuse holders are installed. Its fast-acting characteristic makes it appropriate for protecting resistive loads, control circuits, and equipment that does not require time-delay fusing to accommodate inrush current. The cylindrical form factor and 20.6 mm diameter fit standard Class J fuse clips and holders commonly found in disconnect switches, control panels, and branch circuit protection assemblies.

Key Features

• 6 amp continuous current rating for low-current circuit protection
• 200 kA interrupting capacity at AC for high fault-current environments
• 100 kA interrupting capacity at DC
• Fast-acting response helps protect sensitive downstream components
• Cylindrical body constructed with fiberglass, GMG, and polyester materials
• Class J form factor fits standard Class J fuse clips and holders

Compatibility

Designed as an OEM-style replacement for Class J cylindrical fuse applications requiring a 6 amp fast-acting fuse with a 20.6 mm diameter body.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. Always de-energize and lockout/tagout the circuit before removing or installing fuses. Verify the fuse holder is rated for Class J fuses and confirm the voltage and current ratings of the circuit match the fuse specifications before energizing. Do not replace a fast-acting fuse with a time-delay fuse without confirming compatibility with the load type and overcurrent protection design.