OVERVIEW

Official designation: Allen-Bradley 140UE-JTF3-D25 (Bulletin 140UE, Molded Case Circuit Breaker Trip Unit)

Role/Application: Adjustable thermal-magnetic trip unit for the 250A J-frame MCCB, offering three-pole overload, short-circuit, and switching protection for motor circuits, including support for integrated accessories.

KEY SPECS SUMMARY

Power: Up to 400 Volts AC

Interfaces / Ports: Internal to MCCB

Indicators: N/A

Operating Temp: Refer to the latest manufacturer manual.

Platform / Compatibility: Bulletin 140UE J-frame

Limit: Rated permanent current 250 Amps

Lifecycle: Discontinued

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What are the adjustable protection ranges for the thermal and magnetic settings?

A: Both thermal overload and magnetic short-circuit protections are adjustable via dials on the trip unit face.

Wiring & Installation:

Q: Can the 140UE-JTF3-D25 be installed into any 140UE breaker frame?

A: This trip unit is specific to the J-frame (250A) molded case circuit breaker line only.

Troubleshooting & Compatibility:

Q: What is the purpose of the auxiliary/alarm combination contact accessory?

A: It provides a contact that switches on breaker trip and may also signal breaker position status.

Replacement & Upgrades:

Q: Is there a newer series that replaces the functionality of the 140UE-JTF3-D25 trip unit?

A: The successor product line is the Bulletin 140G or 140G2 series of molded case circuit breakers.