OVERVIEW

Official designation: Allen-Bradley 140U-H6C3-C40 (Bulletin 140U, Molded Case Circuit Breaker)

Role/Application: H-Frame, 3-pole circuit breaker providing fixed thermal and fixed magnetic LI protection for industrial power distribution, with a high breaking capacity.

KEY SPECS SUMMARY

Power: 600 Volts AC maximum voltage

Interfaces / Ports: Screw connection terminals

Indicators: Internal trip indicator

Operating Temp: Minus 25 to plus 60 degrees C

Platform / Compatibility: H-Frame; Panel or DIN rail mount

Limit: 40 Amperes rated current

Lifecycle: Discontinued by manufacturer

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the Interrupting Rating (Icu) for the 140U-H6C3-C40 breaker at 480 Volts AC?

A: The ultimate short-circuit breaking capacity is 65 kA at 480 Volts AC per UL/CSA.

Wiring & Installation:

Q: What are the recommended cable type and temperature rating for connecting to the main circuit terminals?

A: Use 75 degrees C rated copper wire only, with screw connection terminals.

Troubleshooting & Compatibility:

Q: What type of protection, indicated by the LI trip function, does this fixed thermal-magnetic breaker offer?

A: The breaker provides Long-Time (overload) and Instantaneous (short circuit) protection.

Replacement & Upgrades:

Q: Is the Bulletin 140U H-Frame model 140U-H6C3-C40 still in production, and what is its maximum frame current?

A: The product is discontinued, and the H-Frame series has a maximum current of 125 Amperes.