ABB S202-D40 40A Miniature Breaker D Curve 2 Pole

The ABB S202-D40 is a robust 2-pole miniature circuit breaker designed for reliable circuit protection in demanding industrial environments. This D-curve breaker offers high tripping sensitivity, making it ideal for applications with high inrush currents, such as motor starting and transformer circuits. With a 40A rating, the S202-D40 ensures effective safeguarding against overloads and short circuits, preventing equipment damage and minimizing downtime. Its compact design and DIN-rail mounting facilitate easy integration into existing electrical panels, while its durable construction guarantees long-term performance and operational safety.

Product Specifications

| Feature                | Specification                                   |

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

| Product Series         | S200                                            |

| Type                   | Miniature Circuit Breaker (MCB)                 |

| Poles                  | 2                                               |

| Rated Current (In)     | 40 A                                            |

| Tripping Characteristic| D                                               |

| Breaking Capacity (Icn)| 6 kA                                            |

| Voltage Rating (Ue)    | 400V AC                                         |

| Frequency              | 50/60 Hz                                        |

| Terminal Type          | Screw Terminals                                 |

| Mounting Type          | DIN Rail (35mm)                                 |

| Protection Degree      | IP20                                            |

| Operating Temperature  | -25 to +45 °C                                   |

| Certifications         | CE, IEC, UL (pending confirmation)              |

| Dimensions (H x W x D) | 88mm x 35mm x 77mm                              |

Core Features & Market Positioning

The ABB S202-D40 distinguishes itself through its superior D-curve tripping characteristic, a critical advantage in industrial settings where inductive loads are prevalent. This characteristic provides a higher magnetic trip range (typically 10-20 times the rated current) compared to B or C curves, offering enhanced protection against the high inrush currents associated with motors, transformers, and solenoid coils. This differentiates it from standard MCBs, positioning it as a premium solution for applications requiring robust protection against transient overcurrents without nuisance tripping. Its IEC and UL compliance (where applicable) further underscores its suitability for a wide range of global installations and its reliability in diverse operational conditions.

Key Application Scenarios

The inherent design of the ABB S202-D40 with its D-curve characteristic makes it exceptionally well-suited for protecting inductive loads. Common application scenarios include the direct on-line (DOL) starting of three-phase motors, where significant start-up currents are experienced. It is also the breaker of choice for protecting larger transformer circuits and capacitor banks that exhibit high initial current draws. Furthermore, its 40A rating and 6kA breaking capacity are ideal for sub-distribution boards in commercial buildings, manufacturing plants, and heavy industrial facilities, safeguarding downstream circuits from faults and overloads efficiently.

Practical System Integration Guidance

Integrating the ABB S202-D40 into an electrical system is straightforward due to its standard DIN-rail mounting, ensuring compatibility with most industrial electrical enclosures. Wiring is accomplished via robust screw terminals, accommodating conductors up to a specified gauge (refer to the manual for precise sizing). Proper torque application is critical to ensure secure connections and prevent overheating. When installing in a 2-pole configuration, ensure the breaker is wired to interrupt both the live and neutral conductors simultaneously, providing complete isolation. For motor protection, it's often used in conjunction with thermal overload relays for comprehensive safety.

Operation and Risk Mitigation

The S202-D40 operates automatically, tripping to the "OFF" position when an overcurrent or short circuit condition exceeds its calibrated D-curve threshold. Manual resetting is performed by moving the toggle lever back to the "ON" position after the fault condition has been rectified. To mitigate risks, always ensure the correct amperage and tripping curve are selected for the protected equipment. Never attempt to reset a breaker repeatedly without identifying and resolving the underlying fault. Ensure all work on or near the breaker is performed with the power supply de-energized and locked out.

Scalability & Long-Term Value

The S200 series, to which the S202-D40 belongs, offers a degree of scalability through its compatibility with a wide range of ABB system pro M accessories. These accessories include auxiliary contacts for remote signaling, fault indication modules, and surge protection devices, allowing for enhanced system monitoring and protection. While the S202-D40 is a standalone protective device, its integration into modern control panels can support future upgrades to more sophisticated monitoring systems. Its robust construction and adherence to international standards ensure long-term reliability, reducing the likelihood of premature replacement and contributing to overall system longevity.

Frequently Asked Questions

What is the purpose of the D-curve on the ABB S202-D40 breaker?

The D-curve is designed for high inrush currents. It allows for temporary current surges without tripping. This is crucial for inductive loads like motors.

How does the D-curve differ from C or B curves?

D-curve breakers have a higher magnetic trip range (10-20x In). C-curve is 5-10x In, and B-curve is 3-5x In. This makes D-curve ideal for heavy motor starts.

Can the ABB S202-D40 be used for general lighting circuits?

No, it's generally not recommended for standard lighting. Its D-curve sensitivity is overkill and can lead to nuisance tripping. Use B or C curve for lighting.

What is the breaking capacity of the S202-D40?

This breaker features a breaking capacity of 6 kA. This means it can safely interrupt fault currents up to 6000 Amps. It is suitable for many industrial distribution systems.

How do I install the ABB S202-D40 on a DIN rail?

Simply slide the breaker onto a standard 35mm DIN rail. Ensure it clips securely into place. Then, connect the line and load conductors to the appropriate terminals.

What is the maximum voltage rating for this miniature breaker?

The ABB S202-D40 has a rated voltage (Ue) of 400V AC. This makes it suitable for most standard industrial power distribution systems in many regions.

What type of terminal connections does the S202-D40 utilize?

It uses robust screw terminals for secure wire connections. Ensure the correct wire size and torque are used for optimal performance and safety.

What are the operating temperature limits for this device?

The operating temperature range for the S202-D40 is from -25°C to +45°C. Avoid operating outside these conditions for reliable performance.

What does "2 Pole" mean for the S202-D40 breaker?

"2 Pole" signifies that the breaker interrupts both live and neutral conductors simultaneously. This ensures complete isolation of the circuit when tripped.

Where is the ABB S202-D40 commonly applied in industrial settings?

It is frequently used for protecting motors, transformers, and capacitor banks. It's also applied in sub-distribution boards within manufacturing facilities.