Eaton LDC3400 Molded Case Circuit Breaker - UL 489
Part Number: LDC3400
Quick Summary
LDC3400 molded case circuit breaker protects industrial power systems in control panels. It is designed for reliable, high‑current protection in three‑phase environments. Engineers often contend with nuisance trips, limited wiring space, and the challenge of selecting devices that won’t slow machine start‑ups. UL 489 certification underpins safety and performance, while the Series C platform is commonly integrated into modern assemblies that run at 600 VAC and 250 VDC. The LDC3400 combines robust protection with straightforward installation, delivering value in machine builds, panel upgrades, and control cabinets, and aligning with common automation and electrical procurement workflows.
Product Information
Extended Description
LDC3400 Eaton: Eaton Series C complete molded case circuit breaker, L-frame, LDC, Fixed thermal, fixed magnetic trip, Three-pole, 400A, 600 Vac, 250 Vdc, 200 kAIC at 240 Vac, 100 kAIC at 480 Vac, Aluminum, Line and load, 50/60 Hz
Product Name
Eaton Series C complete molded case circuit breaker
Catalog Number
LDC3400
UPC
786679046258
Product Length/Depth
8 in
Product Height
10 in
Product Width
10 in
Product Weight
21 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
Voltage rating
600 Vac, 250 Vdc
Trip Type
T186
Circuit breaker type
LDC
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
200 kAIC at 240 Vac 100 kAIC at 480 Vac
Number of poles
Three-pole
Application of Tap Rules to Molded Case Breaker Terminals
Application of Tap Rules to Molded Case Breaker Terminals
Application of Tap Rules to Molded Case Breaker Terminals
StrandAble terminals product aid
StrandAble terminals product aid
StrandAble terminals product aid
StrandAble terminals product aid
StrandAble terminals product aid
StrandAble terminals product aid
StrandAble terminals product aid
Breaker service centers
Circuit Protection, Molded Case Circuit Breakers, Volume 4, Tab 2
Circuit breakers explained
Circuit breakers explained
Eaton Specification Sheet - LDC3400
Eaton Specification Sheet - LDC3400
Eaton Specification Sheet - LDC3400
Eaton Specification Sheet - LDC3400
Eaton Specification Sheet - LDC3400
Feature: 400 A amperage rating with high interrupt capability. Business impact: protects equipment from damaging faults while allowing coordinated protection strategies across multiple devices. Application: suitable for 3‑phase power distribution and heavy motor loads in automation and packaging lines. The result is reduced downtime and improved uptime metrics. Feature: Fixed thermal and fixed magnetic trip (T186). Business impact: minimizes nuisance trips while preserving protection selectivity, aiding maintenance planning and reducing unplanned outages. Application: ideal for critical conveyors, presses, and CNC machines where stable operation matters. Feature: 3‑pole L‑frame with line/load terminals (aluminum). Business impact: simplifies wiring, enables easier field installation, and supports durable connections in harsh environments. Application: control panels, switchgear, and machine centers requiring robust, fast protection. Feature: 600 VAC / 250 VDC ratings and 50/60 Hz compatibility. Business impact: broad electrical compatibility reduces part variety and stocking costs while meeting common industrial standards. Application: plant power distribution and machine control across global facilities. Feature: UL 489 certification and Series C compatibility. Business impact: ensures regulatory compliance for panel assemblies and streamlines procurement and commissioning. Application: new builds and retrofits in manufacturing and process industries. Feature: Physical dimensions and weight (8 in L, 10 in W, 10 in H, 21 lb). Business impact: compact footprint supports denser panels and easier mounting, cutting material and labor costs. Application: space‑constrained control panels and machine enclosures.
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FAQs
Begin with system de‑energization and verify compatibility with a three‑pole, L‑frame MCCB. Connect conductors to the aluminum line and load terminals using appropriate conductor sizes per Eaton’s installation guidelines. Mount the unit in a compatible enclosure, ensure proper clearance, and verify the fixed thermal/magnetic trip (T186) is correctly set for your protection scheme. Refer to the Eaton specification sheet for torque values and wiring recommendations.
The LDC3400 provides 400 A continuous rating, 600 VAC and 250 VDC voltage ratings, and interrupt ratings of 200 kAIC at 240 VAC and 100 kAIC at 480 VAC. Its fixed thermal and magnetic trip (T186) ensures fast, selective fault clearing. With a 50/60 Hz rating, it supports typical global power systems, enabling reliable protection for motors, drives, and distribution panels.
Yes. The LDC3400 is a three‑pole, Series C MCCB designed for motor protection and panel distribution. Its L‑frame with line/load terminals simplifies wiring, while the fixed trip provides dependable overload protection. This makes it suitable for motor control centers, switchgear, and automation panels where reliable fault interruption and minimal downtime are essential.
The LDC3400 carries UL 489 listing, confirming compliance for molded case circuit breakers in industrial equipment. This certification supports safe operation, standardization, and acceptance in North American panels. When specifying for global or regulated environments, confirm local requirements, as some regions may require additional approvals beyond UL 489.
The LDC3400 delivers value through robust protection and high interrupt ratings that reduce downtime from faults. Its compact footprint simplifies panel design and wiring, lowering installation labor. A one‑year Eaton warranty and availability of replacement parts further reduce maintenance costs, contributing to faster return on investment in production lines with frequent switching and motor starts.