OVERVIEW

Official designation: Allen-Bradley 140U-D6D2-B40 (Bulletin 140U, Molded Case Circuit Breaker)

Role/Application: D-Frame, 2-pole current limiting MCCB with a 4 A rated current, providing thermal-magnetic protection for short-circuit and overcurrent conditions in industrial circuits.

KEY SPECS SUMMARY

Power: 600 Volts AC maximum

Interfaces / Ports: Load and line terminals

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 adjustable 15 to 20 Amperes

Lifecycle: Discontinued by manufacturer

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the maximum high short-circuit Interrupting Rating (kAIC) for this D-Frame breaker?

A: The breaker has a high Interrupting Rating of 100 kAIC, suitable for challenging applications.

Wiring & Installation:

Q: What is the required tightening torque for the screw terminals on the 140U-D6D2-B40 unit?

A: Refer to the latest manufacturer manual for specific torque requirements for the terminal connections.

Troubleshooting & Compatibility:

Q: What is the maximum voltage rating when the 140U-D6D2-B40 is used in a backfeeding application?

A: This breaker is suitable for backfeeding at a maximum rating of 480Y/277 Volts AC.

Replacement & Upgrades:

Q: What is the recommended modern Allen-Bradley product series to replace the discontinued Bulletin 140U?

A: The suggested replacement series is the Allen-Bradley Bulletin 140UT Molded Case Circuit Breaker.