Eaton LG3400 Engine Generator MCCB - UL 489 Certified
Part Number: LG3400
Quick Summary
The Eaton LG3400 Engine Generator MCCB provides protection for engine-driven power systems. It addresses downtime and costly faults by delivering fast, reliable tripping and clear coordination with generator protection schemes. This unit carries UL 489, CSA Std. C22.2 No. 5, and IEC 947-2 certifications, ensuring compliance across North American and international installations. Designed for easy integration in Series C engine-generator panels, it supports fixed thermal and magnetic trips, line/load terminals, and a compact footprint to simplify field installation and ongoing maintenance while delivering lifecycle cost savings.
Product Information
Extended Description
LG3400 Eaton: Eaton Series C complete EG molded case circuit breaker, L-frame, Fixed thermal and magnetic trips, 600-2500A, Three-pole, 400A, 600 Vac, Line/load, Engine generator, Reverse feed
Product Name
Eaton complete engine generator molded case circuit breaker
Catalog Number
LG3400
UPC
782116127665
Product Length/Depth
5.48 in
Product Height
5.48 in
Product Width
5.48 in
Product Weight
16 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 CSA Std. C22.2 No. 5 IEC 947-2
Amperage Rating
400 A
Voltage rating
600 Vac
Trip Type
T186
Circuit breaker frame type
Complete breaker
Series
Series C
Terminals
Line and load
Frame
L
Class
Engine generator
Generator rating
144 kVA/116 kW at 240 Vac, 289 kVA/231 kW at 480 Vac, 361 kVA/289 kW at 600 Vac
Number of poles
Three-pole
Trip rating
600-2500 A
Functions
Reverse
Engine generator circuit breakers catalog
Circuit Breakers Explained
Eaton Specification Sheet - LG3400
Feature: Three-pole, L-frame complete breaker with fixed thermal and magnetic trips; Business Impact: Robust, predictable protection for engine-driven systems, reducing unplanned outages and equipment damage; Application: Engine generator sets requiring reliable protection at 600 Vac with a 400 A rating. Feature: Generator rating across 240, 480, and 600 Vac (144 kVA/116 kW, 289 kVA/231 kW, 361 kVA/289 kW); Business Impact: Flexible sizing for standby or prime power, enabling scalable protection as generator requirements evolve; Application: Multi-voltage gensets and stand-by installations. Feature: Series C, Line/Load terminals, and Trip Type T186; Business Impact: Consistent trip coordination and straightforward installation in standard panels; Application: OEM and field retrofits where stop/start sequencing matters. Feature: Certifications UL 489, CSA C22.2 No. 5, IEC 947-2; Business Impact: Regulatory compliance and cross-border acceptance; Application: Global deployments in accordance with electrical codes. Feature: Reverse feed function support; Business Impact: Enhanced protection against backfeed scenarios common in engine-generator configurations; Application: Engine-generator with reverse power flow. Feature: 25-000 warranty and 1 year from installation or 18 months from shipment; Business Impact: Lower risk and assured serviceability; Application: Long-term asset protection in mission-critical facilities.
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FAQs
To install LG3400, mount the complete breaker in the engine-generator panel using the provided line and load terminals. Ensure the panel is compatible with Series C framing and the L-frame dimensions. Verify the 600 Vac rating aligns with your genset bus voltage, then secure with proper torque on all terminal connections to maintain reliable protection and trip performance.
LG3400 is a three-pole, L-frame molded case circuit breaker with a 400 A amperage rating and a 600 Vac voltage rating. It provides fixed thermal and magnetic trips with a T186 trip type and is designed for engine-generator protection. The generator rating spans 144 kVA/116 kW at 240 Vac, 289 kVA/231 kW at 480 Vac, and 361 kVA/289 kW at 600 Vac.
Yes. The LG3400 includes a reverse feed function, specifically noted in its configurations. This capability helps guard against backfeed conditions that can occur in engine-driven power systems, improving protection coordination during start-up and transient events and supporting safer, more reliable operation of standby or prime power installations.
LG3400 carries UL 489, CSA Std. C22.2 No. 5, and IEC 947-2 certifications. These approvals ensure compliance with North American and international electrical standards, enabling cross-border deployment in industrial facilities. When specifying, confirm local code requirements for generator protection and switchgear compatibility to leverage these certifications fully.
LG3400 is covered by Eaton's policy, offering a one-year warranty from the date of installation or up to eighteen months from shipment, whichever comes first. For maintenance, follow standard molded-case breaker practices: periodic inspection of terminals, cleaning of dust from the enclosure, and verifying trip units are within tolerance. This helps sustain reliable interruption protection and minimizes unexpected downtime.