The Allen-Bradley 140-CMN-4000 is a Motor Protection Circuit Breaker (MPCB) from the Allen-Bradley Bulletin 140M product family. It is designed for protecting motor branch circuits by combining manual motor disconnect capability with adjustable motor overload and short-circuit protection.
This type of circuit breaker is commonly installed in motor starter assemblies, control panels, and industrial machinery where protection of individual motors is required. The 140-CMN-4000 is typically selected as part of an existing motor control configuration and is frequently purchased as a replacement component for installed Allen-Bradley motor protection systems.
Unlike standard miniature circuit breakers used for general electrical protection, motor protection circuit breakers are specifically intended for motor circuits, where overload characteristics and coordination with contactors and starters are important considerations.
Product Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Bulletin | 140M |
| Catalog Number | 140-CMN-4000 |
| Product Type | Motor Protection Circuit Breaker |
| Application | Motor branch circuit protection |
| Protection Function | Motor overload and short-circuit protection |
| Installation Type | Panel mounting |
| Product Family | Bulletin 140M Motor Protection Circuit Breakers |
| Mounting Application | Motor control assemblies |
| Circuit Function | Manual motor disconnect and protection |
Motor Circuit Protection Application
The 140-CMN-4000 is used in industrial motor control circuits where protection is required between the power supply and motor starter components.
Typical installation locations include:
- Motor control centers
- Machine control cabinets
- Industrial production equipment
- Pump and fan systems
- Conveyor systems
- Automated machinery
In these applications, the circuit breaker helps protect motors and associated wiring from abnormal current conditions while providing a means for manual circuit isolation during maintenance activities.
Technical Characteristics
| Feature | Description |
|---|---|
| Device Category | Motor protection circuit breaker |
| Protection Scope | Motor overload and short circuit events |
| Operating Purpose | Motor circuit switching and protection |
| Installation Environment | Industrial electrical panels |
| Coordination Use | Motor starter and contactor assemblies |
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Selection Considerations for Replacement
When replacing an installed 140M series motor protection circuit breaker, maintenance teams usually verify the following information:
| Check Item | Purpose |
|---|---|
| Existing Catalog Number | Confirm exact replacement model |
| Motor Application | Match the protected motor circuit |
| Starter Configuration | Ensure coordination with existing components |
| Panel Installation | Verify mounting arrangement |
The catalog number should be matched carefully because motor protection devices within the same product family may have different ratings and application ranges.
Allen-Bradley motor protection circuit breakers are commonly found in equipment requiring dedicated motor protection, including:
- Industrial machinery
- Material handling equipment
- HVAC-related motor applications
- Packaging equipment
- Process equipment
- Factory automation systems
These devices are generally maintained as part of the electrical control cabinet spare inventory.
Bulletin 140M Product Family Reference
The 140-CMN-4000 belongs to the Allen-Bradley Bulletin 140M motor protection product range.
Related product categories include:
| Component Type | Function |
|---|---|
| Motor Protection Circuit Breakers | Motor overload and short-circuit protection |
| Motor Starters | Motor switching control |
| Contactors | Motor power switching |
| Auxiliary Accessories | Control panel expansion |
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