Eaton JG3125CT Molded Case Circuit Breaker - UL 489
Part Number: JG3125CT
Quick Summary
Eaton JG3125CT engine generator molded case circuit breaker protects engine-driven power systems. Engine rooms, remote sites, and standby power setups demand reliable protection that trips decisively under fault without nuisance outages, and this unit delivers the rugged performance needed to keep critical equipment online. This device is CSA Certified, UL Listed, and IEC rated to IEC 947-2, with UL 489 recognition ensuring electrical safety and regulatory alignment across North America and beyond. Designed for 125 A at 600 Vac with three-pole architecture and a reverse feed capability, it also supports center-tap studs for dual voltage installations, enabling flexible configurations. In practice, you gain uptime, streamlined maintenance, and procurement simplicity for mission-critical generator applications.
Product Information
Extended Description
JG3125CT Eaton: Eaton Series C complete EG molded case circuit breaker, J-frame, Complete breaker, Thermal-magnetic trip, Three-pole, 125A, 600 Vac, 14 kAIC at 480 Vac, Line and load, Engine generator, Reverse feed, 60 Hz
Product Name
Eaton complete engine generator molded case circuit breaker
Catalog Number
JG3125CT
UPC
786679108840
Product Length/Depth
6 in
Product Height
7 in
Product Width
12 in
Product Weight
9.21 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
CSA Certified UL 489 IEC Rated UL Listed CSA Std. C22.2 No. 5 IEC 947-2
Amperage Rating
125 A
Voltage rating
600 Vac
Trip Type
T268
Circuit breaker frame type
Complete breaker
Terminals
Line and load
Frame
J
Frequency rating
60 Hz
Class
Engine generator
Accessories
Center tap studs for dual voltage applications
Interrupt rating
14 kAIC at 480 Vac
Number of poles
Three-pole
Functions
Reverse
Engine generator circuit breakers catalog
Circuit Breakers Explained
Eaton Specification Sheet - JG3125CT
Three-pole construction and a thermal-magnetic trip (Feature) deliver precise, predictable fault clearing (Business Impact) for engine-generator protection in demanding standby and prime power applications. The 125 A rating at 600 Vac (Feature) provides robust protection for medium-size generator feeds while maintaining a compact form factor, and the 14 kAIC rating at 480 Vac (Feature) ensures high-energy fault handling in larger systems (Business Impact). This combination reduces unplanned outages, improves safety margins, and aligns with common protection philosophies used in industrial generator sets (Application). In real-world deployments, engineers can rely on Eaton's proven design to meet performance objectives without complex customization. J-frame complete breaker construction and line/load terminals (Feature) simplify installation, wiring, and future maintenance in field upgrades (Business Impact). Reverse feed capability and center tap studs for dual voltage applications (Feature) enable flexible configurations for both single- and dual-voltage engine-generator panels (Application). The module integrates with standard protection architectures, reducing modification risk and speeding up panel modernization projects (Business Impact). Engineers can count on reliable mechanical fit and straightforward commissioning thanks to Eaton's J-frame specifications and documented installation practices (Application). Certifications and rating are explicit: CSA Certified, UL Listed, IEC Rated to IEC 947-2, and UL 489 recognition (Feature) provide broad regulatory confidence (Business Impact). This breadth of compliance supports export readiness and installer acceptance across North America and international markets, mitigating compliance bottlenecks (Application). The unit also carries a standard warranty under Eaton policy 25-000, aligning with service commitments and spare parts planning (Business Impact). With 60 Hz operation and engine-generator duty emphasis, the product remains suitable for diverse generator-driven facilities (Application). Centering on compatibility, the JG3125CT integrates with standard electrical protection architectures (Feature) supporting straightforward replacement in existing panels (Application). Its dimensions (6 in depth, 12 in width, 7 in height) and weight (9.21 lb) translate to manageable handling, shipping, and on-site installation (Business Impact). Interchangeability with existing Eaton protection schemes minimizes downtime during replacements and shortens commissioning times (Application). The rating and features translate to measurable uptime improvements and reduced spare parts inventory in mission-critical facilities (Business Impact). Overall, the JG3125CT delivers reliable protection for engine-generator systems with regulatory peace of mind and straightforward procurement (Application).
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FAQs
The JG3125CT is designed for engine-generator protection panels operating at 600 Vac and 60 Hz, with a 125 A rating and 14 kAIC capacity. It fits standard line/load terminal configurations and supports center-tap dual-voltage installations, making it a straightforward replacement in both retrofit and new builds for generator feeds.
Key specs include a 125 A amperage rating, 600 Vac voltage rating, a thermal-magnetic trip (T268) with a 14 kAIC interrupt rating at 480 Vac, and a three-pole, J-frame construction designed for engine-generator use. It also operates at 60 Hz and uses line and load terminals for easy wiring.
Yes. The JG3125CT is purpose-built for engine-generator protection, offering a complete breaker with features like reverse feed, center tap studs for dual voltage, and a robust interrupt rating. Its three-pole design and engine-generator classification ensure it aligns with typical generator protection schemes and industry practices.
The breaker is CSA Certified, UL Listed, and IEC rated to IEC 947-2, with UL 489 recognition. This broad certification set supports regulatory compliance, safe operation, and market acceptance across North America and international projects.
Eaton provides a warranty per policy 25-000, one year from installation or eighteen months from shipment, whichever occurs first. This predictable coverage helps with maintenance budgeting, reduces unexpected service costs, and supports ROI through longer-term reliability for mission-critical generator protection.