Eaton LDB3400 Molded Case Circuit Breaker - UL 489
Part Number: LDB3400
Quick Summary
Eaton LDB3400 Molded Case Circuit Breaker provides reliable overcurrent protection for motor and distribution panels in industrial facilities. In critical automation environments, nuisance trips, delayed maintenance, and compatibility gaps can lead to costly downtime. This unit carries UL 489 certification, signaling alignment with one of the most widely adopted safety standards for molded case breakers, and it integrates with Eaton Series C components to simplify stocking and service. With 400 A continuous rating, fixed thermal-magnetic trip, and aluminum line-and-load terminals, it offers dependable protection in 50/60 Hz systems. By choosing this MCCB, engineers reduce downtime, simplify procurement, and improve safety across electrical distribution and motor control networks.
Product Information
Extended Description
LDB3400 Eaton: Eaton Series C complete molded case circuit breaker, L-frame, LDB, Complete breaker, Fixed thermal, fixed magnetic trip type, Three-pole, 400A, 65 kAIC at 240 Vac, 35 kAIC at 480 Vac, Aluminum, Line and load, 50/60 Hz
Product Name
Eaton Series C complete molded case circuit breaker
Catalog Number
LDB3400
UPC
786679147924
Product Length/Depth
4.06 in
Product Height
8.25 in
Product Width
8.25 in
Product Weight
20 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
UL 489
Amperage Rating
400 A
Trip Type
T186
Circuit breaker type
LDB
Circuit breaker frame type
Complete breaker
Series
Series C
Terminals
Line and load
Frame
L
Frequency rating
50 to 60 Hz
Terminal material
Aluminum
Interrupt rating
65 kAIC at 240 Vac 35 kAIC at 480 Vac
Number of poles
Three-pole
Application of Multi-Wire Terminals for Molded Case Circuit Breakers
Application of Multi-Wire Terminals for Molded Case Circuit Breakers
Application of Multi-Wire Terminals for Molded Case Circuit Breakers
Multi-wire lugs product aid
Multi-wire lugs product aid
Multi-wire lugs product aid
Multi-wire lugs product aid
Multi-wire lugs product aid
Multi-wire lugs product aid
Multi-wire lugs product aid
Breaker service centers
Circuit Protection, Molded Case Circuit Breakers, Volume 4, Tab 2
Circuit breakers explained
Circuit breakers explained
Eaton Specification Sheet - LDB3400
Eaton Specification Sheet - LDB3400
Eaton Specification Sheet - LDB3400
Eaton Specification Sheet - LDB3400
Eaton Specification Sheet - LDB3400
Feature: 400 A amperage rating and three-pole L-frame design with fixed thermal-magnetic trip (T186). Business impact: Provides robust protection for large distribution panels and motor loads, reducing nuisance trips and enabling predictable performance in demanding environments. Application: Main and feeder protections in industrial switchgear and motor control centers. Feature: High interrupt ratings of 65 kAIC at 240 Vac and 35 kAIC at 480 Vac. Business impact: Withstands high fault currents typical in heavy industrial facilities, improving system reliability and safety margins. Application: Heavy-duty feeders and service entrances in metal enclosures. Feature: Aluminum line and load terminals with a complete breaker frame (L-frame, Series C). Business impact: Lighter wiring with excellent conductivity, easier field installation, and compatibility with a broad range of lugs and accessories. Application: Field wiring in panels, MCCs, and control panels where ease of installation matters. Feature: 50/60 Hz operation, three-pole design, and UL 489 certified. Business impact: Ensures compliance with global electrical safety standards while supporting standard plant frequency ranges, enabling cross-border projects. Application: Global manufacturing lines, regional distribution centers, and retrofit projects. Feature: Compact form factor with 4.06 in depth and 8.25 in height/width, plus a 20 lb weight. Business impact: Simplifies enclosure planning, reduces cabinet space, and lowers shipping/handling costs. Application: New builds and retrofits where space is at a premium. Feature: Comprehensive documentation and warranty support (Eaton policy 25-000). Business impact: Minimizes risk with clearly defined coverage and post-sale service, supporting long-term Total Cost of Ownership reductions. Application: Procurement decisions for project quotes and service contracts.
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FAQs
The LDB3400 is a three-pole, Series C molded case circuit breaker designed for main and branch protection in industrial power distribution, motor control centers, and service panels, delivering reliable overcurrent protection at 400 A with high fault-current interrupt ratings.
Yes. The LDB3400 uses aluminum terminals for line and load connections, with a compact L-frame and 4.06 in depth, 8.25 in height, and 8.25 in width, facilitating straightforward field wiring and enclosure fit.
The LDB3400 provides 65 kAIC interrupt rating at 240 Vac and 35 kAIC at 480 Vac, enabling robust protection against high fault currents in diverse industrial applications.
The breaker carries UL 489 certification and is covered by Eaton's warranty policy 25-000, offering one year from installation or eighteen months from shipment, whichever comes first.
With a complete breaker design, 400 A rating, fixed thermal-magnetic trip, and standardization within Eaton Series C, it reduces stocking complexity, speeds installation, and lowers downtime, delivering measurable ROI in maintenance and retrofit projects.