Ferraz Shawmut A4J25 Class J Fast-acting Fuse 25A

Product Description

The FERRAZ SHAWMUT A4J25 is a Class J fast-acting cylindrical fuse rated at 25 amps, designed for high-performance electrical circuit protection in demanding commercial and industrial applications. This fuse provides rapid overcurrent interruption, helping to protect sensitive downstream equipment from damage caused by short circuits and overloads. Constructed with a fiberglass and polyester body, the A4J25 delivers an interrupting rating of 100 kA at DC and 200 kA at AC, making it suitable for installations where high fault-current capacity is required. Licensed electricians and industrial maintenance technicians are the primary installers of this component.

The A4J25 is suited for commercial and industrial electrical panels, motor control centers, and power distribution equipment where Class J fuse protection is specified. Its cylindrical form factor and fast-acting response make it appropriate for circuits requiring precise, rapid response to overcurrent events. This fuse fits standard Class J fuse holders and blocks sized for cylindrical fuse elements with a 20.6 mm diameter body.

Key Features

• Fast-acting response for rapid overcurrent and short-circuit protection
• 25 amp continuous current rating
• High interrupting capacity: 100 kA at DC, 200 kA at AC
• Cylindrical body measuring 20.6 mm in diameter
• Fiberglass, GMG, and polyester construction for durability in demanding environments
• Class J rating for use in appropriately rated fuse holders and blocks

Compatibility

Designed as an OEM-style replacement for Class J cylindrical fuse applications in standard fuse holders and power distribution blocks rated for this fuse class and size.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out the circuit before removing or installing any fuse. Verify that the fuse holder or block is rated for Class J fuses and for the voltage and current of the circuit being protected. Never replace a fuse with one of a higher amperage rating than specified by the circuit design.