140U UL MPCBs
Allen-Bradley 140U UL Motor Circuit Protectors (MPCBs)
Allen-Bradley 140U UL motor circuit protectors (MPCBs) are used to protect motors and branch circuits in industrial automation systems. These devices provide compact motor protection with manual disconnect capability and are commonly installed in MCCs, industrial control panels, and OEM equipment where serviceability and dependable motor protection are essential.
The 140U UL series is often selected in applications that require a compact branch protection solution with configurable current settings and straightforward installation. Matching the correct model requires verifying the adjustable current range against motor full-load current (FLA), along with frame size, voltage rating, interrupting rating, and accessory compatibility. Choosing the right MPCB helps maintain compatibility with the motor starter and overall panel design.
Typical applications
- Motor protection for conveyors, pumps, fans, and compressors
- Industrial control panels and MCC applications
- OEM machinery and packaged equipment
- Maintenance replacement for installed systems
- Spare inventory for critical production equipment
Key selection factors
- Adjustable current range matching motor full-load current (FLA)
- Frame size and mechanical fit
- Number of poles and voltage class
- Interrupting rating and application protection requirements
- Accessory support and integration with motor starters
Related categories
If you are replacing an existing 140U UL MPCB, confirm the motor full-load current, adjustable setting range, rated voltage, and required interrupting capacity before installation to ensure proper protection and compatibility.