Mersen A4J70 Class J Fuse 70 Amp 600 Volt

Product Description

The MERSEN A4J70 is a Class J current-limiting fuse rated at 70 amps and 600 volts AC. Class J fuses are compact, fast-acting overcurrent protection devices widely used in industrial and commercial electrical systems where high fault-current interrupting capacity is required in a small form factor. This fuse provides reliable branch-circuit and feeder protection and is installed by licensed electricians in panelboards, fusible disconnects, and motor-control equipment. The A4J70 ships in a pack of 5 units, making it practical for stocking or multi-point installations.

Class J fuses are a standard selection for protecting motors, transformers, and other inductive loads in commercial and light industrial facilities. They are commonly installed in fusible safety switches and disconnect enclosures rated for 600-volt service. The compact dimensions of the A4J70 allow it to fit in space-constrained enclosures where larger fuse classes would not be suitable. Electricians also use Class J fuses as an upgrade path in applications where a higher interrupting rating is needed compared to standard Class H or K fuses.

Key Features

• 70-amp continuous current rating for branch-circuit and feeder protection
• 600-volt AC rating suitable for standard commercial and light industrial service
• Class J current-limiting design provides high interrupting capacity in a compact body
• Fast-acting response limits let-through energy to protect downstream equipment
• Sold in a pack of 5 for efficient stocking and multi-point installations

Compatibility

Designed as an OEM-style replacement for Class J fusible disconnect switches and panelboard fuse holders rated at 600 volts and 70 amps or greater.

Installation Notes

Installation must be performed by a qualified, licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. De-energize and lockout/tagout the circuit completely before removing or installing any fuse. Verify that the fuse holder or disconnect is rated for Class J fuses at the required voltage and amperage before installation. Never replace a fuse with a unit of a higher ampere rating than the circuit is designed to carry.

Technical Specifications

• Amperage: 70 amps
• Voltage Rating: 600 volts AC
• Fuse Class: Class J
• Package Quantity: 5 per pack
• Package Dimensions (L x W x H): 6.000 inches x 5.380 inches x 1.060 inches
• Weight: 0.240 pounds
• UPC: 78200196028

Standard Information

• Brand: MERSEN
• Manufacturer Part Number: A4J70