Eaton MDLB3300 Complete MCCB - UL Listed
Part Number: MDLB3300
Quick Summary
The Eaton MDLB3300 Complete MCCB provides reliable overcurrent protection for industrial control panels and motor circuits. Designers often struggle with selecting the right frame size, achieving accurate trip coordination, and meeting aggressive installation schedules. Key certifications include UL Listed for safety compliance; many global installations also consider CE marking and appropriate IP ratings based on enclosure conditions. By aligning with these standards, you gain faster commissioning, reduced fault investigations, and lower lifecycle costs across regional facilities. This model supports scalable protection for automation, motor control centers, and power distribution in a lean, compliant design.
Product Information
Extended Description
MDLB3300 Eaton: Eaton Series C complete molded case circuit breaker, MDL-frame, MDLB, Complete breaker, Fixed thermal, fixed magnetic trip type, Three-pole, 300A, 65 kAIC at 240 Vac, 50 kAIC at 480 Vac, 50/60 Hz
Product Name
Eaton Series C complete molded case circuit breaker
Catalog Number
MDLB3300
UPC
782114586259
Product Length/Depth
0.01 in
Product Height
0.01 in
Product Width
0.01 in
Product Weight
0.01 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 Listed
Type
Complete breaker
Amperage Rating
300 A
Trip Type
T186
Circuit breaker type
MDLB
Circuit breaker frame type
Complete breaker
Series
Series C
Frame
MDL
Frequency rating
50 to 60 Hz
Interrupt rating
65 kAIC at 240 Vac 50 kAIC at 480 Vac
Number of poles
Three-pole
UL listed 100%-rated molded case circuit breakers
UL listed 100%-rated molded case circuit breakers
UL listed 100%-rated molded case circuit breakers
Multi-wire lugs product aid
Multi-wire lugs product aid
Multi-wire lugs product aid
Multi-wire lugs product aid
Multi-wire lugs product aid
Multi-wire lugs product aid
Multi-wire lugs product aid
Breaker service centers
Circuit Protection, Molded Case Circuit Breakers, Volume 4, Tab 2
Circuit breakers explained
Circuit breakers explained
MOEM MCCB product selection guide
MOEM MCCB product selection guide
MOEM MCCB product selection guide
MOEM MCCB product selection guide
MOEM MCCB product selection guide
Feature: Three-pole MDLB3300 complete breaker with fixed thermal-magnetic trip. Business Impact: Delivers reliable, coordinated protection for multi‑phase motor feeders, reducing nuisance trips and enabling predictable maintenance windows. Application: Ideal for control panels and motor control centers in industrial automation environments. The integration simplifies wiring and reduces installation time while maintaining precise protection curves. Feature: High interrupt rating of 65 kAIC at 240 VAC and 50 kAIC at 480 VAC. Business Impact: Enables safe interruption of high fault currents, protecting feeders and critical equipment from catastrophic damage. Application: Suitable for facilities with high short-circuit potential, such as process plants and heavy manufacturing lines. Feature: 50/60 Hz frequency rating. Business Impact: Ensures global compatibility and regional adaptability, minimizing the need for alternative devices during site expansion. Application: Global operations and multi-region projects where common protection devices streamline procurement. Feature: UL Listed with Series C MDL frame compatibility. Business Impact: Facilitates compliance, procurement approval, and standardization across panels and assemblies. Application: Panel builders and OEMs seeking proven, auditable safety certifications. Feature: Warranty and service support. Business Impact: Reduces lifecycle risk with a defined warranty window (one year from installation or eighteen months from shipment). Application: Asset management programs and maintenance planning for continuous operation. Feature: Compact, complete breaker design within the Series C ecosystem. Business Impact: Improves enclosure efficiency and reduces ballast in control panels, enabling denser layouts. Application: Modern motor control centers and distribution boards where space is at a premium.
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FAQs
When installing the MDLB3300 in a three-pole panel, ensure the enclosure is rated for 240/480 VAC service and that the MDL frame is compatible with your panelbus. Verify proper lug connections or busbar interfaces and follow the manufacturer’s torque specs to maintain ULListed protection and trip coordination. Plan for clear access to trip indicators and serviceability during maintenance.
The MDLB3300 is a 300 A complete MCCB with a trip type T186. It offers a 65 kAIC interrupt rating at 240 VAC and 50 kAIC at 480 VAC, operating at 50/60 Hz, and it is a three-pole device within the Series C MDL frame.
Yes, the MDLB3300 is UL Listed, confirming compliance with safety standards for molded case circuit breakers. This designation supports regulatory acceptance in North America and simplifies panel approvals, OEM sourcing, and maintenance audits. Always verify local CE or IP requirements for regional deployments, depending on enclosure and environment.
The MDLB3300 carries Eaton’s standard warranty of one year from installation or eighteen months from shipment, whichever occurs first. This warranty reduces total cost of ownership by covering manufacturing defects and supports predictable maintenance budgeting in capital projects.
The MDLB3300 is ideal for three-pole motor feeders, control panels, and power-distribution scenarios in automation and manufacturing environments. Its 300 A rating, high interrupt capability, and UL Listed status make it suitable for medium-power motor control centers and panelboards requiring reliable, compliant protection with global relevance.