Eaton KG3300WA12S43X02Y04 Engine Generator MCCB - UL Listed
Part Number: KG3300WA12S43X02Y04
Quick Summary
KG3300WA12S43X02Y04 Engine generator molded case circuit breaker protects generator systems in industrial facilities. Manufacturers and maintenance teams often struggle with incorrect protection settings, nuisance trips, and integration with complete engine-generator packages. UL Listed certification ensures safety and reliability for critical power paths in demanding environments, with 60 Hz operation at 600 Vac and a three-pole protection scheme. Its compatibility with Eaton line and load options, a built-in 2A-2B auxiliary switch, and a 12-24 Vac/dc shunt trip on left side streamline installation and reduce lifecycle costs. This combination supports faster commissioning, easier field maintenance, and predictable protection outcomes across generator sets up to 300 A.
Product Information
Extended Description
KG3300WA12S43X02Y04 Eaton: Eaton complete EG molded case circuit breaker, K-frame, KG, Fixed thermal, fixed magnetic trip, Three-pole, 300A, no term., optional line or load, 2A-2B same side w/right pigtail, 12-24 Vac/dc opposite side w/left pigtail 3TA400K, TA350K
Product Name
Eaton complete engine generator molded case circuit breaker
Catalog Number
KG3300WA12S43X02Y04
UPC
786679164594
Product Length/Depth
14.6 in
Product Height
6.3 in
Product Width
6.8 in
Product Weight
13.25 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
UL Listed
Amperage Rating
300 A
Voltage rating
600 Vac
Trip Type
T186
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 left pigtail opposite
Terminals
Without terminals, optional line or load
Frame
K
Frequency rating
60 Hz
Class
Engine generator
Line
3TA400K
Prod load
TA350K
Interrupt rating
18 kAIC at 240 Vac 14 kAIC at 480 Vac
Number of poles
Three-pole
Trip rating
500-1000 A
Functions
Reverse
Engine generator circuit breakers catalog
Circuit Breakers Explained
Eaton Specification Sheet - KG3300WA12S43X02Y04
Selling Policy 25-000 - Distribution and Control Products and Services
Implementation of arc flash mitigating solutions at industrial manufacturing facilities
Feature: 300 A amperage rating. Business impact: provides robust protection for large generator circuits, reducing the risk of overheating and equipment damage while minimizing nuisance trips that disrupt uptime. Application: ideal for engine-generator sets in manufacturing plants where reliable automatic protection is non-negotiable. Feature: 600 Vac voltage rating and 60 Hz frequency. Business impact: aligns with standard industrial power supplies and generator outputs, eliminating the need for adapters and accelerating panel assembly. Application: power distribution and protection in utility-scale gensets and critical process lines. Feature: Trip Type T186 with high interrupt ratings (18 kAIC at 240 Vac, 14 kAIC at 480 Vac). Business impact: enables fast, selective interruption, lowering arc energy exposure and safeguarding downstream equipment. Application: critical protection for three-phase generator feeds in harsh industrial settings. Feature: Frame KG, complete breaker with optional line or load terminals. Business impact: compact footprint and modular design simplify retrofits and OEM builds, reducing wiring complexity. Application: integrates into engine-generator packages without rework. Feature: Optional 2A-2B auxiliary switch and shunt trip 12-24 Vac/dc. Business impact: enables remote signaling, interlocking, and automated shutdown sequences. Application: plant safety systems, arc-flash mitigation, and remote-control schemes. Feature: Warranty and support. Business impact: provides risk reduction and access to Eaton resources for commissioning and maintenance. Application: procurement planning and lifecycle management in spare-part catalogs.
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FAQs
When installing the KG3300WA12S43X02Y04, ensure proper alignment with optional line or load terminals and plan for the left-side shunt trip (12-24 Vac/dc) and right-side auxiliary switch (2A-2B). The unit supports a right-side pigtail for the auxiliary contact and a left-side pigtail for the shunt trip, enabling remote interlock and signaling in typical engine-generator assemblies. Verify panel space and clearance per OEM guidelines to maintain reliable operation and ease field servicing.
Key specifications include a 300 A amperage rating, 600 Vac voltage rating, and 60 Hz frequency for standard industrial power systems. It is a three-pole KG frame complete breaker with a T186 trip type. The interrupt ratings are 18 kAIC at 240 Vac and 14 kAIC at 480 Vac, supporting robust short-circuit protection for engine-generator applications while maintaining coordination with downstream protections.
Yes. Designed as a complete engine-generator molded case circuit breaker, it protects three-phase generator feeds with a rigid 300 A, 600 Vac specification, and a T186 trip profile for fast fault interruption. The option for line/load terminals and remote shunt trip integrates well with industrial control systems, ensuring safe shutdown sequences and uptime in heavy manufacturing environments.
The KG3300WA12S43X02Y04 is covered by Eaton’s policy 25-000, offering a one-year warranty from the date of installation or eighteen months from shipment, whichever occurs first. This warranty supports field service, spare parts availability, and access to Eaton technical resources for commissioning, maintenance, and troubleshooting across engine-generator protection applications.
Official documentation is available in the product downloads section: Engine generator circuit breakers catalog, Circuit Breakers Explained video, Specification Sheet, Selling Policy, and White Paper on arc-flash mitigation. Key assets include the catalog ca01214001e.pdf and the KG3300WA12S43X02Y04 specification sheet, which provide installation guidelines, electrical ratings, and compatibility notes.