OVERVIEW

Official designation: Allen-Bradley 140U-D6D3-C10 (Bulletin 140U-D, Molded Case Circuit Breaker)

Role/Application: D-Frame, 3-pole current limiting thermal-magnetic MCCB with a fixed 10 A rated current for industrial low-voltage short-circuit and overcurrent protection.

KEY SPECS SUMMARY

Power: 600 Volts AC maximum

Interfaces / Ports: Screw terminals for copper wire

Indicators: Trip status flag

Operating Temp: Minus 25 to plus 60 degrees C

Platform / Compatibility: D-Frame; UL 489, CSA, IEC 60947-2

Limit: Magnetic trip fixed at 15 to 20 times rated current

Lifecycle: Discontinued by manufacturer

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the high interrupting capacity of this 10 Amp D-Frame MCCB at 480 Volts AC?

A: The breaker provides a high Interrupting Rating of 100 kA at 480 Volts AC.

Wiring & Installation:

Q: What is the recommended tightening torque for the line and load terminals on this D-Frame unit?

A: The required tightening torque is 2.0 to 2.5 Newton meters or 18 to 22 pound inches.

Troubleshooting & Compatibility:

Q: Does the 140U-D6D3-C10 include a built-in mechanism for phase-loss protection?

A: This breaker does not have integrated phase-loss protection and requires external devices.

Replacement & Upgrades:

Q: What is the typical modern Allen-Bradley replacement series for the discontinued Bulletin 140U MCCB line?

A: The Bulletin 140G Molded Case Circuit Breaker series is the suggested current replacement product family.