Eaton Cutler-Hammer 8RBT4-400 Expulsion Fuse Refill Unit

Description:

The Cutler-Hammer 8RBT4-400E Fuse is used in medium-voltage electrical distribution systems to provide overcurrent protection for transformers, switchgear, and feeder circuits. Commonly installed in indoor metal-enclosed switchgear, fused switches, and distribution equipment utilizing Type RBT expulsion fuse holders for 7.2 kV class power systems. Maintenance electricians and power system technicians use this fuse refill unit for equipment repair, routine maintenance, and replacement of expired or fault-cleared protective fuses.

Applications:

The Cutler-Hammer 8RBT4-400E is a time-lag expulsion fuse refill designed for use with Type RBT fuseholders in medium-voltage distribution systems. It provides dependable overload and short-circuit protection while coordinating with upstream and downstream protective devices. It is widely used in industrial plants, utility substations, power distribution networks, mining operations, and commercial electrical infrastructure requiring reliable medium-voltage circuit protection.

Technical Specifications:

• Manufacturer: Cutler-Hammer (Eaton)
• Part Number: 8RBT4-400E
• Product Type: Medium-Voltage Expulsion Fuse Refill Unit
• Fuse Series: RBT Time-Lag
• Ampere Rating: 400E (720 A nominal E-rating)
• Maximum Voltage: 8.3 kV
• Nominal System Voltage: 7.2 kV
• Fuse Speed: Time-Lag
• Compatible Fuseholders: Type 8RBA8 and compatible RBT fuseholders
• Mounting: Medium-voltage expulsion fuse assembly
• Application: Transformer, feeder, and switchgear protection
• Typical Installations: Metal-enclosed switchgear, fused disconnect switches, industrial power distribution equipment, and utility distribution systems.

Common Replacements:

• Cutler-Hammer 8RBT4-300E
• Cutler-Hammer 8RBT4-250E
• Cutler-Hammer 8RBA4-400E