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OVERVIEW
Official designation: Allen-Bradley 140U-I3C3-C80 (Bulletin 140U, Molded Case Circuit Breaker)
Role/Application: I-Frame, 3-pole MCCB rated 80 Amperes. It provides protection against overload and short circuit currents using a fixed thermal and fixed magnetic trip mechanism.
KEY SPECS SUMMARY
Power: 600 Volts AC maximum
Interfaces / Ports: Non-interchangeable lugs
Indicators: Trip status flag
Operating Temp: 40 degrees C maximum
Platform / Compatibility: I-Frame; UL 489, CSA, CE
Limit: Interrupting rating 35 kA at 480 Volts AC
Lifecycle: Discontinued, replacement 140G
FREQUENTLY ASKED QUESTIONS
Technical Specifications:
Q: What is the typical fixed magnetic trip rating for the 80 Ampere I-Frame breaker?
A: The fixed magnetic trip is set at approximately 10 times the rated current, which is 800 Amperes.
Wiring & Installation:
Q: What are the voltage ratings for the 140U-I3C3-C80 when used in DC applications?
A: The breaker is also rated for up to 250 Volts DC operation.
Troubleshooting & Compatibility:
Q: Can the trip unit be adjusted or replaced to change the trip settings on this model?
A: This model features a non-interchangeable, fixed thermal and magnetic trip unit.
Replacement & Upgrades:
Q: What is the recommended modern Allen-Bradley replacement series for the discontinued Bulletin 140U line?
A: The current recommended replacement is the Allen-Bradley Bulletin 140G Molded Case Circuit Breaker series.
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