Eaton LHH3400FFG Molded Case Breaker - UL Listed
Part Number: LHH3400FFG
Quick Summary
Eaton LHH3400FFG molded case circuit breaker protects critical power feeders in industrial switchgear. Engineers often wrestle with achieving fast coordination, minimizing downtime, and staying compliant with evolving standards. This LG-frame LH complete breaker carries CSA certification and UL Listing, with HACR rating for controlled equipment, helping meet safety and reliability requirements. From three-pole operation to metric mounting hardware, it supports Series G protection while delivering 400 A at 600 Vac, reliable line-and-load interruption, and rugged performance in demanding environments. Use cases include motor feeders, process panels, and control gear where selective coordination and quick fault isolation are essential.
Product Information
Extended Description
LHH3400FFG Eaton: Eaton Series G molded case circuit breaker, LG-frame, LH, Fixed thermal, fixed magnetic trip, Three-pole, 400A, 600 Vac, 100 kAIC at 240 Vac, 70 kAIC at 415 Vac, 65 kAIC at 480 Vac, 35 kAIC at 600 Vac, Line and load, Metric
Product Name
Eaton Series G complete molded case circuit breaker
Catalog Number
LHH3400FFG
UPC
786685227115
Product Length/Depth
15.75 in
Product Height
7.13 in
Product Width
7.75 in
Product Weight
16.25 lb
Warranty
Eaton Selling Policy 25-000, one (1) year from the date of installation of the Product or eighteen (18) months from the date of shipment of the Product, whichever occurs first.
Certifications
CSA Certified UL Listed
Catalog Notes
LG breaker is HACR rated
Type
Complete breaker
Amperage Rating
400 A
Voltage rating
600 Vac
Trip Type
T186
Circuit breaker type
LH
Circuit breaker frame type
Complete breaker
Terminals
Line and load
Frame
LG
Mounting hardware
Metric
Interrupt rating
35 kAIC at 600 Vac 100 kAIC at 240 Vac 65 kAIC at 480 Vac 70 kAIC at 415 Vac
Number of poles
Three-pole
Application of Tap Rules to Molded Case Breaker Terminals
Application of Tap Rules to Molded Case Breaker Terminals
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
Breaker service centers
Circuit Protection, Molded Case Circuit Breakers, Volume 4, Tab 2
Eaton Specification Sheet - LHH3400FFG
Eaton Specification Sheet - LHH3400FFG
Eaton Specification Sheet - LHH3400FFG
Feature: 400 A amperage rating for high-load circuits. Business Impact: Enables reliable protection for large motors and feeders with reduced nuisance trips and improved equipment uptime. Application: Suitable for industrial power distributions and process lines that routinely handle elevated current without compromising protection. Feature: 600 Vac voltage rating with fixed thermal and fixed magnetic trip (T186). Business Impact: Delivers fast, predictable trip performance across normal and fault conditions, enabling timely fault isolation and improved safety margins. Application: Ideal for machines and panels operating on medium-voltage downstream gear and mixed-load boards. Feature: Three-pole LH frame (LG) with line-and-load terminals and metric mounting. Business Impact: Simplifies installation and ensures consistent alignment in standard enclosures, reducing commissioning time and field wiring errors. Application: Fits common MCCBs in control panels and gear racks that use metric hardware. Feature: 100 kAIC at 240 Vac, 70 kAIC at 415 Vac, 65 kAIC at 480 Vac, 35 kAIC at 600 Vac interrupt ratings. Business Impact: Provides robust short-circuit protection across a range of system voltages, improving selectivity and minimizing collateral damage. Application: Critical for process lines, packaging, and HVAC controls requiring durable fault handling. Feature: Certifications and HACR rating (CSA Certified, UL Listed). Business Impact: Validates compliance with stringent electrical standards, easing procurement audits and panel approvals. Application: Suitable for code-compliant control panels and machinery requiring recognized safety certifications. Feature: Compact footprint with 15.75 in length, 7.13 in height, 7.75 in width, and 16.25 lb weight. Business Impact: Enables flexible enclosure planning and straightforward retrofits in existing layouts. Application: Replacement or upgrade projects where space and weight constraints matter. This section highlights compatibility with Series G protection concepts, the LG frame, and the practical benefits of a complete breaker in terms of maintenance planning, spare-part compatibility, and long-term reliability.
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FAQs
The LHH3400FFG uses the LG frame and LH series configuration with metric mounting hardware, designed for standard control panels and MCCBs. It features line-and-load terminals and a three-pole arrangement, enabling straightforward retrofits and alignment with common enclosure layouts. Check the panel cutouts and mounting space to ensure a clean fit and proper clearance for thermal performance.
Key specs include 400 A amperage, 600 Vac rating, fixed thermal-magnetic trip (T186), and interrupt ratings of 100 kAIC at 240 Vac, 70 kAIC at 415 Vac, 65 kAIC at 480 Vac, and 35 kAIC at 600 Vac. These values inform coordination studies, selective protection schematics, and fault current calculations for reliable safety margins.
Yes. With a 400 A rating and a substantial interrupt capacity across multiple voltages, the LHH3400FFG is well-suited for motor feeders and large loads in manufacturing or processing environments. Its HACR rating and UL/CSA certifications help ensure compliance and safe operation within motor control panels.
This breaker is CSA Certified and UL Listed, with HACR rating indicated in catalog notes. These certifications indicate compliance with recognized safety and performance standards, facilitate regulatory approvals, and support procurement and installation in code-compliant industrial facilities.
Warranty terms follow Eaton policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. This helps manage after-sales expectations, supports maintenance budgeting, and aligns with common industrial equipment service cycles.