OVERVIEW

Official designation: Allen-Bradley 140U-I6C3-C20 (Bulletin 140U, Molded Case Circuit Breaker)

Role/Application: I-Frame, 3-pole thermal-magnetic MCCB with a fixed 20 Amperes trip, providing short-circuit and overload protection for motor control up to 7.5 HP.

KEY SPECS SUMMARY

Power: 600 Volts AC maximum

Interfaces / Ports: Load and line lugs

Indicators: Trip status flag

Operating Temp: Minus 25 to plus 60 degrees C

Platform / Compatibility: I-Frame; NEMA Size 1 motor starter

Limit: 20 Amperes rated current

Lifecycle: Discontinued by manufacturer

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the maximum Interrupting Capacity (kAIC) of the 140U-I6C3-C20 breaker at 480 Volts AC?

A: The breaker has a high Interrupting Rating of 65 kA at 480 Volts AC.

Wiring & Installation:

Q: What is the maximum motor horsepower rating supported by this 20 Amp breaker at 575 Volts AC?

A: This breaker supports a maximum motor rating of 7.5 HP at 575 Volts AC.

Troubleshooting & Compatibility:

Q: What is the magnetic trip minimum setting range for the I-Frame 140U-I6C3-C20 model?

A: The non-adjustable magnetic trip minimum is 500 Amperes.

Replacement & Upgrades:

Q: What is the recommended replacement series for the discontinued Allen-Bradley 140U-I6C3-C20?

A: The current replacement is the Bulletin 140G MCCB series, such as the 140G-H6C3-C20 model.