Description
Eaton KW3400F | 400A Series C Circuit Breaker Frame
Product Introduction
In a breaker replacement project, matching the frame is only one part of the job. The Eaton KW3400F is a Series C K-frame, 400 A molded-case circuit breaker frame intended for use in a properly configured breaker assembly. It is not the same as ordering a complete KW3400 breaker with all required trip and terminal components.
The KW3400F is specified for 600 VAC or 250 VDC applications, with a published interrupting rating of 45 kAIC at 415 VAC. Eaton’s product information also identifies the frame as being supplied without terminals. Before purchasing a surplus unit, verify the required trip unit, terminal arrangement, interrupting rating, and compatibility with the installed equipment.
KW3400
Key Technical Specifications
- Catalog Number: KW3400F
- Manufacturer: Eaton
- Series: Series C
- Breaker Type: KW
- Frame: K-frame
- Frame Rating: 400 A
- Pole Configuration: 3-pole
- Voltage Rating: 600 VAC / 250 VDC
- Interrupting Rating: 45 kAIC at 415 VAC
- Trip Type: Adjustable thermal, adjustable magnetic
- Assembly Type: Frame only
- Terminals: Without terminals
- Approximate Dimensions: 4.1 × 5.5 × 5.5 inches
- Approximate Weight: 9.25 lb
Dimensions and weight are published product data; confirm the physical configuration of the offered unit, particularly if it has been previously assembled or modified.
Global Sourcing & Live-Test SOP
For a used or surplus KW3400F, verify the frame identity and configuration before accepting it as a replacement component.
1. Inbound Verification
- Photograph the complete Eaton nameplate and catalog number.
- Confirm KW3400F, not KW3400 or another K-frame variant.
- Inspect the molded case for cracks, carbon tracking, heat damage, or evidence of modification.
- Check the line/load connection areas and mounting features.
- Record serial or date codes where present.
- Confirm whether terminals, trip unit, or other components are included—or explicitly excluded.
- Compare the offered frame with the original assembly and approved equipment documentation.
2. Configuration & Compatibility Review
- Verify that the application calls for a KW-series K-frame configuration.
- Confirm the required trip unit and its compatibility with the frame.
- Check the specified interrupting rating against the system’s available fault current.
- Confirm terminal type, conductor range, and lug requirements.
- Verify mounting and enclosure compatibility.
- Do not infer complete-breaker equivalency from frame size or ampere rating alone.
3. Inspection & Functional Assessment
- Have qualified electrical personnel inspect the breaker frame and any included components.
- Check operating mechanism condition where applicable.
- Verify that moving parts operate as specified by the manufacturer.
- Inspect contact and arc-chute areas if the supplied assembly includes them and the manufacturer’s service procedure permits inspection.
- Record visible defects and any prior service history.
- Do not represent a visual inspection as a certified trip test.
4. Electrical Testing & Documentation
- Perform insulation-resistance and operational testing only under an appropriate Eaton or qualified service procedure.
- If a complete breaker assembly is supplied, verify trip-unit identity and settings.
- Use a qualified breaker test facility for trip testing where required by the application.
- Record test equipment, test date, results, and the exact tested configuration.
- Do not return the unit to service based solely on continuity checks or a successful mechanical operation.
5. Final Preparation
- Photograph the final configuration before packing.
- Keep loose trip units, terminals, and hardware identified and associated with the correct assembly.
- Protect exposed connection areas against impact and contamination.
- Use suitable packaging to prevent damage during international shipment.
- Include the inspection report and clearly state whether the item is a frame only or a tested complete assembly.
Field Engineer’s Pitfall Guide
❗ Frame-only does not mean complete breaker
The is specified as a frame-only product. Do not assume that a trip unit, terminals, lugs, or mounting accessories are included. Confirm the bill of materials before procurement.
❗ Do not substitute based on ampere rating alone
A 400 A K-frame designation does not establish equivalent interrupting capacity, trip characteristics, terminal arrangement, or application approval. Verify the complete catalog number and required electrical ratings against the original equipment documentation.
❗ Interrupting rating must match the installation
The is listed at 45 kAIC at 415 VAC. Confirm the actual system voltage and available fault current, and ensure the complete breaker assembly is suitable for the installation. Do not assume a rating at one voltage applies unchanged at another.
Intent-Driven FAQ
Is the Eaton a complete circuit breaker?
No. Eaton specifies as a frame-only Series C molded-case breaker product. Verify which additional components are included with the offered unit.
What is the current rating of the ?
The is rated at 400 A. The application’s trip configuration and protection requirements still need to be verified.
What voltage is the rated for?
Published specifications list 600 VAC and 250 VDC. Confirm suitability for the actual system and required interrupting rating before installation.
Does the include terminals?
No. Eaton’s product specification identifies the frame as supplied without terminals.
Can the replace any Eaton 400 A K-frame breaker?
No. Match the breaker family, frame, trip-unit configuration, terminal arrangement, interrupting rating, and application requirements. Similar current ratings do not guarantee interchangeability.
Is the hot-swappable?
Do not treat it as hot-swappable. Circuit-breaker replacement or servicing must follow the equipment manufacturer’s isolation, lockout/tagout, and verification procedures and be performed by qualified personnel.
What should I request when buying a surplus ?
Request clear nameplate and full-unit photos, confirmation that the item is , a list of included components, physical-condition details, and any available inspection or test documentation. If you need a complete breaker, specify the required trip unit and terminals rather than purchasing the frame alone.
