Eaton MDLB3700 Molded Case Circuit Breaker - UL Listed

Part Number: MDLB3700
Manufacturer
Eaton
Part number
MDLB3700

Quick Summary

Molded Case Circuit Breaker MDLB3700 protects industrial power distribution by interrupting overcurrents in the event of faults. This model is designed for robust operation in manufacturing and automation environments where uptime matters and reliable protection is non-negotiable. UL Listed certification supports compliance across multiple markets, while fixed thermal and fixed magnetic trip mechanisms deliver consistent protection for high-current panels. The MDLB3700 combines Series C design with a complete breaker concept, enabling straightforward integration into existing MDL frame installations and alignment with Series C accessories. For engineers and procurement teams, this means predictable performance, easier spec-to-approval wiring, and reduced total cost of ownership through fewer nuisance trips and simpler maintenance.

Product Information

Extended Description

MDLB3700 Eaton: Eaton Series C complete molded case circuit breaker, MDL-frame, MDLB, Complete breaker, Fixed thermal, fixed magnetic trip type, Three-pole, 700A, 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
MDLB3700
UPC
782114586310
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
Amperage Rating
700 A
Trip Type
T186
Circuit breaker type
MDLB
Circuit breaker frame type
Complete breaker
Series
Series C
Frame
MDL
Interrupt rating
50 kAIC at 480 Vac 65 kAIC at 240 Vac
Number of poles
Three-pole
Feature → Business Impact → Application: The MDLB3700 provides three-pole protection with a 700 A amperage rating, enabling precise coordination in large distribution panels and reducing the risk of under- or over-protection in heavy-duty systems. This translates to improved system reliability, lower downtime, and safer startup sequences in automated production lines. Feature → Business Impact → Application: Fixed thermal and fixed magnetic trip types deliver fast, dependable fault interruption at 50 kAIC at 480 Vac and 65 kAIC at 240 Vac, supporting fast fault clearance and protecting motors, drives, and feeders in high-energy environments. Feature → Business Impact → Application: Complete breaker within the MDL frame and Series C family offers plug-and-play compatibility with existing MCCB footprints, accelerating panel upgrades and new installations while maintaining electrical coordination with StrandAble terminals and multi-wire configurations. Feature → Business Impact → Application: Three-pole construction provides balanced protection across phases, simplifying wiring and terminations in three-phase systems and enabling straightforward integration with motor control centers in robotics and process automation. Feature → Business Impact → Application: UL Listed certification and documented cataloging support compliance and quality expectations, helping you meet procurement standards and reducing rework during audits across industrial facilities. Feature → Business Impact → Application: Time-current curves and specification documentation in the Series C catalog ensure engineers can correctly select and coordinate breakers for motor starting, protection, and energy management in automated lines.

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FAQs

The MDLB3700 is a three-pole molded case circuit breaker designed for Series C panels and MDL frames, ideal for industrial power distribution in manufacturing, automation, and process control environments. Its fixed thermal/magnetic trip ensures reliable protection in standard 50/60 Hz systems, while UL Listed certification supports consistent acceptance in quality-conscious facilities.
Key performance specifications include a 700 A amperage rating, 50 kAIC interrupt rating at 480 Vac, and 65 kAIC at 240 Vac, with a 50/60 Hz operating range. The unit is a three-pole, Series C MDL frame complete breaker with fixed thermal and fixed magnetic trip, designed for dependable protection in medium-to-high fault-current environments.
Yes. The MDLB3700 belongs to the Series C family and supports multi-wire terminals as outlined in Eaton application notes. StrandAble terminal accessories and related documentation are available to optimize wiring practices, simplify terminations, and improve reliability in complex panel assemblies.
The MDLB3700 is UL Listed, ensuring conformity with recognized safety standards for molded case circuit breakers. This certification supports regulatory compliance and simplifying procurement and audit processes in industrial facilities.
Choosing the MDLB3700 delivers robust overcurrent protection, fast fault interruption, and compatibility with existing Series C installations, reducing downtime and maintenance costs. With a high interrupt rating and a proven trip mechanism, it supports safe motor control, energy management, and reliable panel protection across automation workflows.