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- Allen-Bradley
- 140G-K3F4-D40
- Molded Case Circuit Breaker
- USA
- 205 x 103.5 x 185 mm
- 4.15 kg
- Xiamen, China
- New & In Stock
- T/T, PayPal, Western Union
- 1 Year
- 1-3 Working Days
- DHL, UPS, TNT, FedEx and EMS.
- 24-Hour Service
- COO
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Our advantage
Global Logistics
We have a 10-year logistics and express cooperation agreement, so our products can be shipped to any place in the world.
Brand new and original
Our products are imported in bulk from the place of origin. Because of the cooperative relationship, our products are all original and 100% new.
24-hour service
We provide 7*24 hours service to our customers. We will be there whenever you need us.
Price advantage
All our products are priced very favorably because we have our own warehouse and supply.
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Product Overview
The Allen-Bradley 140G-K3F4-D40 Molded Case Circuit Breaker is a high-capacity industrial protection device engineered for reliable circuit protection in demanding power distribution and motor control applications. Designed for industrial automation environments, this molded case circuit breaker provides dependable protection against overloads, short circuits, and electrical faults while supporting stable system operation.
As part of the Allen-Bradley 140G series, the 140G-K3F4-D40 features a robust molded case design with thermal magnetic trip protection, making it suitable for industrial facilities requiring high-performance electrical protection and operational reliability. Its compact structure supports efficient installation inside industrial control panels and power distribution systems.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Allen-Bradley |
| Model | 140G-K3F4-D40 |
| Product Type | Molded Case Circuit Breaker |
| Breaker Type | Thermal Magnetic MCCB |
| Number of Poles | 4 Pole |
| Rated Current | 400 A |
| Rated Voltage | Up to 800 V AC |
| Interrupting Capacity | 35 kA |
| Frame Type | K Frame |
| Trip Functions | Thermal and Magnetic Protection |
| Mounting Type | Bolt-on mounting |
| Connection Type | Front-side screw connection |
| Dimensions | 205 × 103.5 × 185 mm |
| Weight | 4.15 kg |
| Operating Environment | Industrial electrical systems |
| Reliability | Continuous-duty industrial protection |
Function and Working Principle
The 140G-K3F4-D40 continuously monitors electrical current flowing through industrial power circuits. When abnormal operating conditions such as overloads or short circuits occur, the breaker automatically disconnects the electrical circuit to protect connected equipment and wiring from damage.
Its thermal magnetic protection system combines overload protection with rapid magnetic trip functionality for fast fault interruption and improved operational safety.
This enables:
Reliable overload protection
Rapid short-circuit interruption
Improved electrical system safety
Protection for motors and industrial equipment
Stable industrial power distribution
Its industrial-grade construction ensures dependable protection performance in demanding automation and power control applications.
Role in Industrial Control Systems
The 140G-K3F4-D40 plays a critical role in industrial electrical infrastructure, supporting:
Power distribution protection
Motor control center applications
Industrial automation systems
Equipment isolation and fault protection
Electrical safety management
Industrial energy distribution networks
It helps improve operational safety and maintain stable industrial electrical performance.
Industrial Applications
The Allen-Bradley 140G-K3F4-D40 is widely used in:
Industrial power distribution systems
Motor control centers
Manufacturing facilities
Process automation systems
Heavy industrial machinery
Conveyor and material handling systems
Power generation and utility applications
It is especially suitable for applications requiring high-capacity four-pole circuit protection.
Installation and System Integration
Proper installation ensures safe and reliable operation:
Mounted inside industrial electrical panels
Integrated into motor control and power distribution systems
Connected using industrial bolt-on terminals
Requires proper grounding and protective coordination
Should follow industrial electrical safety standards
Correct installation improves long-term protection performance and operational reliability.
Compatible System Components
The 140G-K3F4-D40 typically works alongside:
Allen-Bradley motor control systems
Industrial switchgear equipment
PLC automation systems
Power distribution panels
Industrial overload protection devices
Variable frequency drive systems
These components together form a complete industrial power protection and automation solution.
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| 140G-K3F3-D40 | 3-Pole MCCB | Three-phase protection | Industrial automation |
| 140G-H Series | Molded Case Circuit Breaker | Compact protection design | Power distribution |
| 140U Series | Industrial Circuit Breaker | Flexible installation | Industrial systems |
| Siemens MCCB Series | Molded Case Breaker | High interrupt capacity | Electrical systems |
| Schneider Compact NSX | Industrial Circuit Breaker | Advanced protection features | Distribution systems |
Key Advantages
Reliable overload and short-circuit protection
High-capacity industrial circuit breaker design
Four-pole protection capability
Thermal magnetic trip functionality
Suitable for demanding industrial environments
Compact molded case construction
Technical FAQs
What is the primary function of the 140G-K3F4-D40?
It protects industrial electrical systems from overloads, short circuits, and electrical faults.
Where is this molded case circuit breaker commonly used?
It is commonly used in industrial power distribution systems, motor control centers, and automation equipment.
Why is four-pole protection important?
It provides protection for all active conductors, improving electrical safety and system reliability in industrial applications.
Conclusion
The Allen-Bradley 140G-K3F4-D40 Molded Case Circuit Breaker is a reliable industrial protection solution designed for demanding power distribution and automation applications. Its durable construction, dependable thermal magnetic protection, and high interrupting capability make it suitable for industrial environments requiring stable and secure electrical operation.
For engineers and maintenance professionals, it provides an effective way to improve electrical system protection, enhance operational safety, and maintain reliable industrial power distribution.