OVERVIEW

Official designation: Allen-Bradley 140U-D6D3-B50 (Bulletin 140U, Molded Case Circuit Breaker)

Role/Application: D-Frame, 3-pole MCCB rated 5 Amperes. It provides fixed thermal and adjustable magnetic overcurrent protection, is 100 percent rated, and features a high breaking capacity for industrial control.

KEY SPECS SUMMARY

Power: 600 Volts AC maximum

Interfaces / Ports: Line and load terminals

Indicators: Trip status flag

Operating Temp: Minus 25 to plus 60 degrees C

Platform / Compatibility: D-Frame; UL 489, CSA, CE

Limit: Interrupting rating 100 kAIC

Lifecycle: Discontinued, replacement 140G

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the magnetic trip adjustment range for the 140U-D6D3-B50 circuit breaker?

A: The magnetic trip range is adjustable between 15 Amperes and 20 Amperes.

Wiring & Installation:

Q: What is the rated insulation voltage (Ui) for this D-Frame molded case circuit breaker?

A: The rated insulation voltage (Ui) according to IEC standards is 690 Volts.

Troubleshooting & Compatibility:

Q: Is this 3-pole breaker suitable for installation in a 230 Volt AC three-phase system?

A: Yes, the 140U-D6D3-B50 is rated for operation at 230 Volts AC in 3-phase applications.

Replacement & Upgrades:

Q: What is the current replacement series recommended by Allen-Bradley for the discontinued 140U line?

A: The current replacement is generally the Allen-Bradley Bulletin 140G series MCCB.