Eaton JG3250W Engine Generator MCB - UL Listed
Part Number: JG3250W
Quick Summary
Eaton JG3250W engine generator molded case circuit breaker protects generator circuits in industrial power systems. This solution helps prevent outages and equipment damage by delivering precise thermal-magnetic protection against overloads and reverse feed conditions. Rigorously certified, it carries UL Listed, CSA Certified, and IEC Rated markings to support compliance in global panels. Designed for 240, 480, and 600 V generator applications, it delivers 250 A of protection with scalable performance, enabling simpler procurement and consistent protection across multiple generator configurations.
Product Information
Extended Description
JG3250W Eaton: Molded Case Engine Generator Circuit Breaker, Series C, JG-frame, Three-pole, 250A, Without terminals, Reverse feed, Thermal magnetic trip, 350-700 pickup, 90 kVA/72 kW at 240V, 181 kVA/144 kW at 480V, 226 kVA/181 kW at 600V generator
Product Name
Eaton complete engine generator molded case circuit breaker
Catalog Number
JG3250W
UPC
786679269428
Product Length/Depth
12 in
Product Height
7 in
Product Width
7 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
IEC 947-2 CSA Std. C22.2 No. 5 CSA Certified IEC Rated UL Listed UL 489
Amperage Rating
250 A
Voltage rating
600 Vac
Trip Type
T268
Circuit breaker frame type
Complete breaker
Terminals
Without terminals
Frame
J
Frequency rating
60 Hz
Class
Engine generator
Interrupt rating
14 kAIC at 480 Vac
Generator rating
90 kVA/72 kW at 240 Vac, 181 kVA/144 kW at 480 Vac, 226 kVA/181 kW at 600 Vac
Number of poles
Three-pole
Functions
Reverse
Engine generator circuit breakers catalog
Circuit Breakers Explained
Eaton Specification Sheet - JG3250W
Selling Policy 25-000 - Distribution and Control Products and Services
Feature: 250 A amperage rating aligns with high-current generator protection; Business Impact: supports reliable startup and return-to-service with reduced nuisance trips; Application: engine generator panels requiring robust MCCB protection. Feature: 600 Vac voltage rating matches common generator outputs; Business Impact: minimizes voltage mismatch risks and simplifies protection coordination; Application: 240/480/600 V standby and prime power systems. Feature: Three-pole, frame J construction; Business Impact: ensures consistent trip coordination and mechanical robustness in harsh environments; Application: industrial engine generator switchgear. Feature: Without terminals reduces field wiring complexity; Business Impact: speeds installation and minimizes wiring errors; Application: compact MCCB installations in generator enclosures. Feature: Thermal-magnetic trip with reverse feed function; Business Impact: delivers fast, reliable fault clearing and protection for engines with reverse power conditions; Application: generator sets in power plants and backup systems. Feature: UL Listed, CSA Certified, IEC Rated; Business Impact: provides compliance confidence and simplifies audits; Application: panel builders targeting North American and international standards.
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FAQs
The JG3250W is a three-pole, frame J molded case circuit breaker designed for engine generator protection and is supplied without terminals, which simplifies panel wiring. Ensure panel clearance, proper mounting within a generator enclosure, and compatibility with 60 Hz systems. Verify that the enclosure allows for adequate cooling to maintain performance under fault conditions.
The JG3250W provides generator-rated protection with an interrupt rating of 14 kAIC at 480 Vac, and accommodates generator ratings of 90 kVA/72 kW at 240 Vac, 181 kVA/144 kW at 480 Vac, and 226 kVA/181 kW at 600 Vac. This makes it suitable for varying genset configurations while maintaining precise thermal-magnetic protection and fast fault clearing.
Yes. With a 250 A amperage rating and a 600 Vac rating, the JG3250W is designed for industrial standby and prime power applications. Its three-pole design, reverse feed capability, and robust 14 kAIC interrupt rating support reliable protection for critical loads and minimize unplanned downtime in large facilities.
The JG3250W carries UL Listed, CSA Certified, and IEC Rated markings, along with IEC 947-2 compatibility. These certifications support regulatory compliance, audits, and cross-border installation requirements, making it easier to specify a single MCCB for multi-region generator projects.
Key ROI drivers include reduced downtime due to reliable protection (low nuisance trips), fewer wiring errors from terminal-free installation, and one-model compatibility across voltages. The unit comes with a one-year warranty or 18 months from shipment (whichever occurs first), and standard Eaton policies help ensure service continuity and predictable maintenance planning.