Eaton FG3125WD05Z05 Engine Generator Molded Case Circuit Breaker - UL 489
Part Number: FG3125WD05Z05
Quick Summary
Eaton FG3125WD05Z05 engine generator molded case circuit breaker protects critical generator circuits. Engineers often struggle with correct trip coordination, selectivity, and reliable protection when retrofitting legacy equipment, leading to unnecessary downtime. This device carries UL 489, IEC 947-2, and CSA Std. C22.2 No. 5 certifications, providing proven safety and cross-border compliance for global projects. With 60 Hz operation and 600 Vac ratings, it delivers precise fixed pickup and robust fault interruption for generator panels. Built for easy installation and serviceability, it helps procurement reduce risk, improve uptime, and simplify maintenance across a range of generator ratings and configurations. In short, it blends performance with practical, install-ready design.
Product Information
Extended Description
FG3125WD05Z05 Eaton: Eaton Series C complete EG molded case circuit breaker, F-frame, FG, Fixed thermal and magnetic trips, Three-pole, 125A, 600 Vac, 18 kAIC at 240 Vac, 14 kAIC at 480 Vac, Line side end cap, optional load side, Reverse, 60 Hz, KPR1AM
Product Name
Eaton complete engine generator molded case circuit breaker
Catalog Number
FG3125WD05Z05
UPC
786685465487
Product Length/Depth
7 in
Product Height
5 in
Product Width
5 in
Product Weight
4 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 489 IEC 947-2 CSA Std. C22.2 No. 5
Amperage Rating
125 A
Voltage rating
600 Vac
Trip Type
T186
Circuit breaker type
FG
Circuit breaker frame type
Complete breaker
Terminals
Line side end cap, optional load side
Frame
F
Frequency rating
60 Hz
Class
Engine generator
Line
KPR1AM
Pickup
Fixed
Prod load
3TA225FD
Interrupt rating
18 kAIC at 240 Vac 14 kAIC at 480 Vac
Generator rating
45 kVA/36 kW at 240V, 90 kVA/72 kW at 480V, 113 kVA/90 kW at 600V
Number of poles
Three-pole
Functions
Reverse
Engine generator circuit breakers catalog
Circuit Breakers Explained
Eaton Specification Sheet - FG3125WD05Z05
Implementation of arc flash mitigating solutions at industrial manufacturing facilities
Feature 1: Three-pole FG frame with fixed thermal and magnetic trips (Trip Type T186) → Business Impact: Delivers reliable overcurrent protection and predictable trip performance, reducing nuisance trips and improving system uptime → Application: Engine generator control panels in 60 Hz, 600 Vac generator installations. Long-tail keywords: molded case breaker for generators, engine generator protection, three-pole MCCB, fixed trip protection. Feature 2: 125 A rating with 600 Vac voltage rating and high interrupt capabilities (18 kAIC at 240 Vac, 14 kAIC at 480 Vac) → Business Impact: Supports robust fault handling for higher fault currents typical in industrial gensets, minimizing damage and downtime → Application: High-current generator feeders and panel boards. Long-tail keywords: high interrupt rating MCCB, 600 Vac protection, generator feeder protection. Feature 3: Line side end cap with optional load side and compatibility with KPR1AM line → Business Impact: Simplifies installation and future expansion, reducing installation time and total cost of ownership → Application: Retrofit projects and new genset installations with flexible terminal options. Long-tail keywords: line side end cap, load side option, generator terminal compatibility. Feature 4: Certifications UL 489, IEC 947-2, CSA Std. C22.2 No. 5 → Business Impact: Ensures regulatory compliance across N. America and international markets, easing procurement and QA audits → Application: Global projects requiring robust certification traceability. Long-tail keywords: industrial circuit breaker certifications, UL 489 compliance, CSA IEC standards. Feature 5: Warranty and support from Eaton (25-000 policy) → Business Impact: Reduces risk with defined warranty, improving total cost of ownership and service planning → Application: Fleet maintenance programs and preventive maintenance schedules. Long-tail keywords: Eaton warranty, installation support, maintenance planning.
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FAQs
Yes. The FG3125WD05Z05 uses the FG frame and three-pole design with line side end cap and optional load side, making it compatible with standard engine generator panels. Its 125 A rating at 600 Vac and fixed trip type T186 are suited for common genset control enclosures and 60 Hz systems.
Key specs include a 125 A rating, 600 Vac voltage rating, and interrupt ratings of 18 kAIC at 240 Vac and 14 kAIC at 480 Vac. The fixed pickup and T186 trip type provide reliable short-circuit and overload protection, essential for generator feeders and switchgear in industrial facilities.
The unit covers generator ratings up to 600 Vac with generator ratings listed at 45 kVA/36 kW at 240 V, 90 kVA/72 kW at 480 V, and 113 kVA/90 kW at 600 V, making it suitable for a wide range of industrial engine generator installations and ensuring proper protection across different genset configurations.
This breaker is certified to UL 489, IEC 947-2, and CSA Std. C22.2 No. 5, providing cross-border compliance, safety assurance, and reliability for North American and international projects.
Eaton provides a standard warranty per policy 25-000, one year from installation or eighteen months from shipment, whichever comes first. This, plus access to Eaton catalogs and datasheets, supports predictable maintenance planning and ROI through reduced downtime.