Siemens 3VA1140-5EF32-0AA0 Molded Case Air Circuit Breaker 40A 3P 55kA

The Siemens 3VA1140-5EF32-0AA0 molded case air circuit breaker is a robust 40A, 3-pole unit engineered for superior protection and reliability in demanding industrial environments. Featuring a breaking capacity of 55kA, this breaker offers exceptional short-circuit protection, safeguarding critical electrical infrastructure from severe fault conditions. Its advanced thermal-magnetic trip unit ensures precise overcurrent and short-circuit detection, while its compact design facilitates seamless integration into control panels and switchgear. The 3VA1140-5EF32-0AA0 stands out for its high operational continuity, user-friendly interface, and compliance with international standards, making it a premier choice for engineers and facility managers seeking dependable power distribution and protection solutions.

Product Specifications

| Specification                  | Value                                |

| :----------------------------- | :----------------------------------- |

| Product Type                   | Molded Case Air Circuit Breaker      |

| Siemens Order Number           | 3VA1140-5EF32-0AA0                   |

| Rated Current (In)             | 40 A                                 |

| Number of Poles                | 3                                    |

| Breaking Capacity (Icu/Ics)    | 55 kA at 415V AC                     |

| Trip Unit Type                 | Thermal-Magnetic                     |

| Rated Voltage (Ue)             | Up to 690V AC                        |

| Frequency                      | 50/60 Hz                             |

| Mounting Type                  | DIN Rail / Panel Mount               |

| Connection Type                | Screw Terminals                      |

| Operating Temperature          | -25 to +70 °C                        |

| Compliance Standards           | IEC 60947-2, UL 489, CSA C22.2 No. 14 |

| Protection Degree (Front)      | IP40                                 |

| Terminal Protection Degree     | IP20                                 |

Core Features & Market Positioning

The Siemens 3VA1140-5EF32-0AA0 distinguishes itself through its combination of high breaking capacity and advanced thermal-magnetic trip technology, providing robust protection against overloads and short circuits. Its market positioning is firmly established as a reliable and cost-effective solution for fundamental power distribution protection in a wide array of industrial and commercial applications. Unlike some competitors that offer more complex digital trip units at a higher price point, the 3VA series excels in delivering essential, high-performance circuit protection with straightforward operation and maintenance. This focus on dependable, essential functionality makes it a preferred choice for standard electrical installations where unwavering performance is paramount.

Key Application Scenarios

This circuit breaker is ideally suited for use in main distribution boards, sub-distribution panels, and motor control centers across various industrial sectors, including manufacturing, food and beverage, and data centers. Its 55kA breaking capacity is particularly valuable in areas with potentially high fault currents, ensuring the safety and integrity of the electrical system. Common applications involve protecting power circuits feeding machinery, lighting systems, and auxiliary equipment, where reliable and consistent operation is critical to maintaining production uptime and operational efficiency.

Practical System Integration Guidance

Integrating the Siemens 3VA1140-5EF32-0AA0 is straightforward due to its standardized mounting options, compatible with standard DIN rails and panel mounting configurations. The breaker utilizes screw terminals for secure and reliable electrical connections, accommodating appropriate conductor sizes for its 40A rating. For systems requiring auxiliary contacts or alarm signaling, Siemens offers a range of compatible accessories that can be easily fitted to the breaker, allowing for remote monitoring and status indication without complex wiring. Proper torque must be applied to the terminal screws to ensure optimal electrical contact and prevent overheating.

Operation and Risk Mitigation

Operating the 3VA1140-5EF32-0AA0 is intuitive, with a clear lever mechanism for ON/OFF switching and manual trip reset. Risk mitigation is inherent in its design, particularly its ability to interrupt fault currents up to 55kA, thus preventing catastrophic equipment damage and electrical fires. In the event of a trip, visual indicators on the breaker clearly display the trip status, simplifying fault identification. While the thermal-magnetic trip unit is pre-calibrated, regular visual inspections for dust accumulation and terminal integrity are recommended to maintain optimal performance and prevent nuisance tripping or failure to trip.

Scalability & Long-Term Value

The Siemens 3VA series, including the 3VA1140-5EF32-0AA0, offers a degree of scalability through its compatibility with a wide range of Siemens system components and its ability to integrate into larger automation systems. While this specific model is a fixed-configuration breaker, Siemens provides a broader range of 3VA breakers with varying current ratings and trip units that can be used in conjunction to build a comprehensive protection scheme. Its robust construction and adherence to international quality standards ensure a long service life, minimizing replacement costs and contributing to the overall long-term value of the electrical installation.

Frequently Asked Questions

What is the rated breaking capacity of the Siemens 3VA1140-5EF32-0AA0?

This breaker provides a robust 55kA breaking capacity.

It ensures reliable protection against severe short-circuit events.

This high rating is crucial for safeguarding critical electrical infrastructure.

Can this circuit breaker be used for motor protection?

Yes, with its thermal-magnetic trip unit, it offers overload protection.

Adjustable settings may be required for specific motor starting characteristics.

It is suitable for smaller to medium-sized motor applications.

What are the dimensions of the Siemens 3VA1140-5EF32-0AA0?

Exact dimensions depend on mounting.

It features a compact, space-saving design for panel integration.

Consult the technical datasheet for precise measurements.

What standards does the 3VA1140-5EF32-0AA0 comply with?

It adheres to IEC 60947-2 standards.

UL 489 and CSA C22.2 No. 14 compliance is also included.

These certifications ensure global applicability and safety.

How do I reset the Siemens 3VA1140-5EF32-0AA0 after a trip?

Ensure the fault condition is cleared first.

Move the operating lever to the 'OFF' position.

Then, firmly push the lever to the 'ON' position.

What is the typical application for a 40A, 3-pole circuit breaker?

It is used for main distribution and sub-distribution boards.

It can protect power circuits feeding machinery or equipment.

Ideal for industrial and commercial power systems.

Does this breaker support communication or smart grid integration?

This model typically uses a thermal-magnetic trip unit.

Advanced communication features are usually found on digital trip units.

It can be integrated into SCADA systems via auxiliary contacts.

What is the difference between Icu and Ics in circuit breakers?

Icu is the ultimate short-circuit breaking capacity.

Ics is the service short-circuit breaking capacity.

A breaker must be able to break faults and remain operational.

What accessories are available for the 3VA1140-5EF32-0AA0?

Common accessories include auxiliary and alarm contacts.

Shunt release and undervoltage release modules are also available.

Mounting adapters for various panel types may be offered.

What is the warranty period for this Siemens circuit breaker?

Warranty terms are set by the distributor or installer.

Siemens generally offers robust product warranties.

Refer to your purchase documentation for specifics.