Eaton Cutler-Hammer KD3400 400A 3P 600V Circuit Breaker | AmpState

Designed for everyday electrical work, the Eaton Cutler-Hammer KD3400 400A 3P 600V circuit breaker delivers dependable, precise circuit protection for panelboards, load centers, and electrical distribution systems. This unit is a smart choice for maintenance teams and panel builders who require an exact part-number match to keep service calls efficient and inventory accurate.

• Direct part-number match: KD3400 ensures exact fit, labeling, and compatibility—reducing downtime and mis-orders during maintenance or upgrades.
• Three-pole, 400 A performance: Ideal for three-phase distribution where robust protection and reliable trip characteristics are essential.
• 600 V maximum rating: Suitable for a wide range of commercial and light-industrial panel environments and electrical distribution setups.
• Trusted Eaton Cutler-Hammer lineage: Built for repeated switching and long-term reliability in demanding electrical distributions.
• AmpState availability: Ready to ship through AmpState to support fast procurement and stocking strategies.

Ideal use cases

Use the KD3400 in panelboards and load centers where a 3-pole, 400 A, 600 V device is required. It’s a practical solution for maintenance vans, service crews, and construction projects that demand exact part-number replacements to ensure compatibility with existing panels and documentation.

Specifications at a glance

• Manufacturer: Eaton Cutler-Hammer
• Part number: KD3400
• Product type: Circuit Breaker
• Amperage: 400 A
• Poles: 3
• Voltage: 600 V
• Applications: Panelboards, Load Centers, Electrical Distribution
• Availability: AmpState

Compatibility and installation tips

Before purchasing, confirm that your panel accepts KD3400 devices and that the installation environment matches a 3-pole 400 A, 600 V rating. When replacing an old breaker, having the exact KD3400 part number on hand simplifies ordering, labeling, and warranty considerations. Keep a spare KD3400 on hand in your service fleet to minimize downtime during critical outages.

Available from AmpState. Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit, so you can proceed with confidence and speed.