Eaton FG3040 Engine Generator MCCB - UL Listed
Part Number: FG3040
Quick Summary
The Eaton FG3040 Engine Generator MCCB provides reliable overcurrent protection for engine-driven generators and standby power systems. Engineers often contend with nuisance trips during startup and under-protection of sudden surge loads, which can lead to unplanned downtime or equipment damage. This device carries UL Listed, IEC rated, and CSA certified design credentials, including MIL-DTL-17361 conformance, to meet stringent plant standards. The FG3040 also streamlines installation with line and load terminals and a compact footprint, delivering predictable protection and total cost of ownership reductions for industrial and commercial power systems. For enhanced reliability, it complements engine-generator protection strategies while supporting regulatory compliance and lifecycle performance.
Product Information
Extended Description
FG3040 Eaton: Eaton Series C complete EG molded case circuit breaker, F-frame, FG, Fixed thermal and magnetic trips, Three-pole, 40A, 600 Vac, 18 kAIC at 240 Vac, 14 kAIC at 480 Vac, Line/load, Engine generator, Reverse, 60 Hz, Fixed
Product Name
Eaton complete engine generator molded case circuit breaker
Catalog Number
FG3040
UPC
786679269602
Product Length/Depth
7.5 in
Product Height
6 in
Product Width
5 in
Product Weight
4.55 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
MIL-DTL-17361
Certifications
UL Listed IEC Rated CSA Certified CSA Std. C22.2 No. 5 UL Listed file E7819 UL 489 IEC 947-2 QPL17361
Catalog Notes
Includes both line and load terminals
Type
Engine generator
Amperage Rating
40 A
Voltage rating
600 Vac
Trip Type
T186
Circuit breaker type
FG
Circuit breaker frame type
Complete breaker
Terminals
Line and load
Frame
F
Frequency rating
60 Hz
Class
Engine generator
Pickup
Fixed
Interrupt rating
14 kAIC at 480 Vac 18 kAIC at 240 Vac
Generator rating
14 kVA/12 kW at 240 Vac, 29 kVA/23 kW at 480 Vac, 33 kVA/29 kW at 600 Vac
Number of poles
Three-pole
Functions
Reverse
Engine generator circuit breakers catalog
Circuit Breakers Explained
Eaton Specification Sheet - FG3040
Feature: Three-pole FG frame with fixed thermal and magnetic trips. Business Impact: Precise, reliable protection against overloads and short circuits, reducing motor and generator damage and extending asset life. Application: Suitable for three-phase engine-generator sets operating at 60 Hz. Feature: 40 A amperage rating with 600 Vac rating. Business Impact: Matches common generator and distribution voltages while maintaining safe operation and consistent protection, cutting mis-trips and maintenance costs. Application: Engine-driven equipment and standby power systems with 40 A protection needs. Feature: High interrupt ratings of 18 kAIC at 240 Vac and 14 kAIC at 480 Vac. Business Impact: Allows rapid clearing of high-energy faults, minimizing system impact and outage duration. Application: Industrial gensets and critical loads where fault energy can spike. Feature: Line and load terminals included. Business Impact: Simplifies wiring and reduces installation time, improving field reliability and reducing labor costs. Application: Field installs on generator panels and distribution gear with minimal hardware requirements. Feature: Fixed pickup and T186 trip type. Business Impact: Predictable, repeatable protection behavior, lowering the risk of nuisance trips during startups. Application: Start-up sequences for engine-driven power systems and standby configurations. Feature: Comprehensive certifications (UL Listed, IEC Rated, CSA Certified; MIL-DTL-17361). Business Impact: Demonstrates compliance with industry standards, easing procurement audits and cross-site deployments. Application: Regulatory-heavy facilities and multi-site projects seeking proven safety credentials. Feature: Compact weight and dimensions (4.55 lb; 7.5 in L × 6 in H × 5 in W). Business Impact: Easy installation in tight panels and retrofits, reducing enclosure size requirements and material costs. Application: Small to mid-size generator panels and retrofit projects. Feature: Includes both line and load terminals (Catalog Notes). Business Impact: Simplifies terminal access and wiring for accurate, clean connections. Application: Engine-generator protection circuits and control panels requiring straightforward wiring. Feature: 60 Hz operation with engine-generator class protection. Business Impact: Aligned with common electrical grids and generator sets for predictable performance. Application: 60 Hz industrial power networks and standby systems.
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FAQs
FG3040 is a three-pole molded case circuit breaker with line and load terminals, designed for straightforward wiring in engine-generator panels. The catalog notes confirm both line and loadTerminals are included, enabling clean, reliable connections. Use standard torque specs per the installation manual and verify 60 Hz operation with a 600 Vac system. This minimizes wiring errors and reduces commissioning time.
Yes. FG3040 supports 480 Vac systems with an interrupt rating of 14 kAIC, ensuring fast fault clearance for high-energy events. Its three-pole design and fixed thermal/magnetic trips provide dependable protection across the generator, switchgear, and distribution panels used in 480V engine-generator applications, helping prevent damage during short circuits and startup surges.
FG3040 carries UL Listed, IEC Rated, and CSA Certified attestations, with MIL-DTL-17361 compliance. These certifications signal alignment with global electrical standards, simplify supplier qualification, and support compliance audits in regulated industries. They assure performance under standard test regimes and provide a reliable baseline for safety and reliability in engine-generator protection schemes.
The T186 trip type indicates a fixed-time characteristic for coordination between overload protection and short-circuit protection. In practice, it delivers predictable response during overloads and faults, helping technicians diagnose trips more quickly and ensuring consistent protection during startup transients common to engine-driven loads. If trips occur, verify the generator loading profile and enclosure ventilation first, then inspect wiring integrity.
FG3040’s compact weight (4.55 lb) and integrated line/load terminals simplify installation, reducing labor time and panel space. The device’s rugged ratings and certifications reduce downtime risk and maintenance needs, while its reliable protection minimizes generator and cable wear. This combination supports a favorable ROI through lower fault rates, faster serviceability, and longer service life for engine-generator assets.