Eaton KG3400A12S43 Engine Generator MCCB - UL/IEC
Part Number: KG3400A12S43
Quick Summary
The Eaton KG3400A12S43 Engine Generator MCCB is a high-capacity molded case circuit breaker designed to protect engine-driven power systems. In complex generator applications, unreliable protection can lead to unplanned downtime and expensive equipment damage, so a robust solution is essential. This unit carries UL 489 and IEC 947-2 certifications, and also meets CSA Std. C22.2 No. 5 as well as MIL-DTL-17361 compliance, ensuring broad regulatory coverage. Designed for 600 Vac, 3-pole configurations with a thermal-magnetic trip, it supports right-side auxiliary connections and left-side shunt options for flexible panel integration. Its compact yet rugged K-frame design helps reduce panel footprint while maintaining reliable protection across varying installations. This delivers improved uptime, predictable maintenance, and lower total cost of ownership for critical power systems.
Product Information
Extended Description
KG3400A12S43 Eaton: Eaton Series C complete EG molded case circuit breaker, K-frame, KG, Thermal-magnetic trip, 1000-2000A trip rating, Three-pole, 400A, 600 Vac, 2A-2B same side w/ right pigtail, 12-24 Vac/dc opposite side w/ left pigtail
Product Name
Eaton complete engine generator molded case circuit breaker
Catalog Number
KG3400A12S43
UPC
786676021708
Product Length/Depth
12.4 in
Product Height
6.3 in
Product Width
7 in
Product Weight
13.26 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.
Compliances
MIL-DTL-17361
Certifications
UL 489 IEC 947-2 UL Listed file E7819 CSA Std. C22.2 No. 5 QPL17361
Type
Engine generator
Amperage Rating
400 A
Voltage rating
600 Vac
Trip Type
T268
Circuit breaker type
KG
Circuit breaker frame type
Complete breaker
Auxiliary switch
2A-2B same side with right pigtail
Shunt trip
12-24 Vac/dc same side with left pigtail shunt
Terminals
Line and load
Frame
K
Frequency rating
60 Hz
Class
Engine generator
Interrupt rating
18 kAIC at 240 Vac 14 kAIC at 480 Vac
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
1000-2000 A
Functions
Reverse
Engine generator circuit breakers catalog
Circuit Breakers Explained
Eaton Specification Sheet - KG3400A12S43
Selling Policy 25-000 - Distribution and Control Products and Services
Feature 1: 400 A amperage rating → Business Impact: Protects generator sets from overload and enables safe coordination with upstream protections in high-current engine-driven power systems → Application: Engine generator protection in industrial plants and data centers. Feature 2: 600 Vac, 60 Hz, three-pole configuration → Business Impact: Delivers precise three-phase protection for balanced generator outputs and efficient panel wiring → Application: Generator switchgear in 3-phase power systems. Feature 3: Thermal-magnetic trip (T268) → Business Impact: Provides fast, reliable fault interruption to minimize damage and downtime → Application: Critical power protection during short circuits or overloads in engine-driven setups. Feature 4: Interrupt ratings 18 kAIC at 240 Vac / 14 kAIC at 480 Vac → Business Impact: High short-circuit withstand ensures safety and continuity in demanding environments → Application: Large motor loads and generator interfaces in manufacturing facilities. Feature 5: Shunt trip 12-24 Vac/dc and auxiliary 2A-2B connections → Business Impact: Flexible control wiring for remote isolation and status signaling → Application: Remote tripping in distributed generator panels and remote monitoring schemes. Feature 6: Frame K; line and load terminals; compact dimensions (12.4 in L × 7 in W × 6.3 in H) → Business Impact: Easy installation and replacement in existing enclosures with minimal footprint → Application: Retrofit projects and new generator installations. Feature 7: Generator ratings up to 144 kVA/116 kW at 240 Vac, 289 kVA/231 kW at 480 Vac, 361 kVA/289 kW at 600 Vac → Business Impact: Scalable protection for a range of engine generator sizes, reducing component diversity → Application: Industrial generators, standby power systems, and peak-shaving setups. Feature 8: Compliance and certifications (UL 489, IEC 947-2, CSA, MIL-DTL-17361) → Business Impact: Simplifies procurement and regulatory adherence across multiple regions → Application: Global projects requiring certified protection devices. Feature 9: 1-year warranty (plus Eaton policy terms) → Business Impact: Confidence in performance and lower risk for commissioning → Application: New installations and service contracts.
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FAQs
KG3400A12S43 is a 3-pole, 600 Vac molded case circuit breaker designed for engine generator panels. It uses line/load terminals and a K-frame construction, with right-side auxiliary connections (2A-2B) and left-side shunt (12-24 Vac/dc). Its compact footprint (12.4 in L × 7 in W × 6.3 in H) supports retrofit into existing enclosures and straightforward field wiring for reliable generator protection.
Key specs include 400 A amperage rating, 600 Vac, 60 Hz, three-pole configuration, and a thermal-magnetic trip (T268). Interrupt ratings are 18 kAIC at 240 Vac and 14 kAIC at 480 Vac, with generator ratings up to 144 kVA/116 kW at 240 Vac, 289 kVA/231 kW at 480 Vac, and 361 kVA/289 kW at 600 Vac.
Yes. Its three-pole, 600 Vac protection with a robust interrupt capacity and thermal-magnetic trip is well-suited for engine-driven power systems in data centers, manufacturing floors, and other critical facilities where reliable generator protection and fast fault interruption are essential.
KG3400A12S43 is compliant with UL 489, IEC 947-2, UL Listed file E7819, CSA Std. C22.2 No. 5, and MIL-DTL-17361. This broad certification supports cross-region procurement and ensures regulatory alignment for safety and performance.
The unit weighs 13.26 lb and has a durable K-frame for reliable field service. It comes with a 1-year warranty (per Eaton policy 25-000) and a defined protection profile that reduces unplanned downtime. Accessory options (shunt and auxiliary) and a clear specification sheet facilitate fast commissioning and long-term operating efficiency.