Eaton JGS4125FAG Molded Case Circuit Breaker - UL Listed
Part Number: JGS4125FAG
Quick Summary
Eaton Series G molded case circuit breaker JGS4125FAG protects industrial power circuits in panels and switchgear. Engineers often struggle to fit robust overcurrent protection into compact control enclosures while preserving serviceability. This MCCB carries UL Listed, CSA Certified, and CE Marked certifications, with IEC ratings that support global deployment. With a 125 A rating at 600 Vac and 50/60 Hz compatibility, it delivers reliable protection, predictable trip curves, and easier maintenance. By aligning with metric mounting and line/load terminals, it reduces installation time and spare parts needs, delivering tangible value for OEMs, panel shops, and system integrators.
Product Information
Extended Description
JGS4125FAG Eaton: Eaton Series G molded case circuit breaker, JG-frame, JG, Fixed thermal, adj. magnetic trip, Four-pole, 125A, 600 Vac, 85 kAIC at 240 Vac, 35 kAIC at 480 Vac, 18 kAIC at 600 Vac, Line/load, Metric, 50/60 Hz, 80% rated
Product Name
Eaton Series G complete molded case circuit breaker
Catalog Number
JGS4125FAG
UPC
782113964218
Product Length/Depth
3.57 in
Product Height
5.34 in
Product Width
5.34 in
Product Weight
8 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
CE Marked
Certifications
CSA Certified UL Listed IEC Rated
Type
Complete breaker
Amperage Rating
125 A
Voltage rating
600 Vac
Trip Type
T185
Circuit breaker type
JG
Circuit breaker frame type
Complete breaker
Protection
0% protected neutral pole
Rating
80% rated
Series
Series G
Terminals
Line and load
Frame
JG
Frequency rating
50/60 Hz
Mounting hardware
Metric
Interrupt rating
18 kAIC at 600 Vac 85 kAIC at 240 Vac 35 kAIC at 480 Vac
Number of poles
Four-pole
Application of Multi-Wire Terminals for Molded Case Circuit Breakers
Application of Multi-Wire Terminals for Molded Case Circuit Breakers
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
High performance operating handles for Series G circuit breakers product aid
Breaker service centers
Circuit Protection, Molded Case Circuit Breakers, Volume 4, Tab 2
NG and ND-Frame molded case circuit breakers
NG and ND-Frame molded case circuit breakers
NG and ND-Frame molded case circuit breakers
Feature: 125 A rating with 600 Vac capacity and four-pole JG frame; Business impact: Extends protection to medium-power feeders while ensuring robust short-circuit interruption, reducing downtime in critical processes; Application: Panelboards and switchgear in industrial automation and process industries. Feature: Fixed thermal, adjustable magnetic trip (T185) with 18 kAIC at 600 Vac (and higher at lower voltages); Business impact: Enables selective coordination and custom fault protection, lowering nuisance trips and enabling safer startup sequences; Application: Motor loads and mixed-circuit panels. Feature: 50/60 Hz operation with metric mounting hardware and line/load terminals; Business impact: Simplifies global installation and retrofits, cutting commissioning time and installation errors; Application: OEM panel builds and retrofit projects. Feature: Certifications and compliance (CE Marked, CSA Certified, UL Listed, IEC Rated); Business impact: Facilitates cross-border deployments and regulatory adherence, reducing risk for multinational plants; Application: Global manufacturing environments and energy-management systems. Feature: Compact, four-pole design with 3.57 in depth and 5.34 in height/width; Business impact: Optimizes panel density without compromising protection, lowering enclosure footprint costs; Application: Space-constrained control panels and MCCs.
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FAQs
Installation requires verifying a compatible JG frame and metric mounting hardware, then mounting the four-pole MCCB with line and load terminals per Eaton installation guidelines. Ensure the device is within 50/60 Hz electrical systems, torque settings are observed, and short-circuit rating aligns with the upstream protection. Following the manufacturer’s wiring diagram minimizes miswiring risks and helps preserve coordination with existing protective devices.
Key specs include 125 A nominal current, 600 Vac voltage rating, and interrupt ratings of 18 kAIC at 600 Vac, 85 kAIC at 240 Vac, and 35 kAIC at 480 Vac. Trip type is T185 with a fixed thermal and adjustable magnetic mechanism. Four poles provide balanced protection for multi-wire feeders, while 50/60 Hz compatibility supports global operations.
Yes. The four-pole JG frame MCCB with a 125 A rating is well-suited for motor control centers, panel boards, and power distribution units in process industries. Its line/load terminals and metric mounting support straightforward integration, while the adjustable magnetic trip helps tailor protection to specific motor inrush and short-circuit conditions.
The JGS4125FAG carries UL Listed, CSA Certified, and IEC Rated certifications, along with CE marking. These certifications support global deployments, simplify supplier qualification, and reduce regulatory risk when supplying equipment across North America, Europe, and regions requiring IEC-based compliance.
Eaton provides a warranty per policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. This, combined with readily available application notes and technical datasheets, supports proactive maintenance planning, faster replacements, and improved total cost of ownership for panel builders and end users.