Siemens 5SY6302-8CC Motor Protection Circuit Breaker 3P 2A
The Siemens 5SY6302-8CC Motor Protection Circuit Breaker (MPCB) 3P 2A is a robust, three-pole miniature circuit breaker designed for reliable protection of electrical circuits, particularly motors, against overcurrents and short circuits. This device offers a tripping characteristic class of C, suitable for inductive loads, and features a rated operational current of 2A. With a breaking capacity of 6 kA according to EN 60898 and 30 kA according to IEC 60947-2, it provides substantial protection in demanding industrial environments. Its compact design with a 70 mm mounting depth and IP20 protection ensures straightforward integration into control panels and electrical installations.
Product Specifications
| Feature | Specification |
| :-------------------------- | :--------------------------------------------- |
| Product Designation | Miniature Circuit Breaker |
| Brand Name | SENTRON |
| Model Number | 5SY6302-8CC (also referenced as 5SY6302-7) |
| Number of Poles | 3 |
| Pole Design | 3P |
| Rated Operational Current | 2A |
| Tripping Characteristic | C |
| Rated Voltage (AC) | 400V |
| Insulation Voltage (Ui) | 440V |
| BreaK Capaciity (A 60898)| 6 q n n And and and and and with with what is Ill it I
| Breaking Capacity (IEC 60947-2)| 30 kA |
| Energy Limitation Class | 3 |
| Overvoltage Category | III |
| Degree of Pollution | 3 |
| Mounting Depth | 70 mm |
| Protection Class (IP) | IP20 (with connected conductors) |
| Mechanical Service Life | 10,000 switching cycles (typical) |
| Power Loss (per pole) | 1.2 W |
| Halogen-Free | Yes |
| Sealable | Yes |
| Suitable for Operation | Infrastructure / Industry |
| Neutral Conductor Switching | No |
| Installable Supplementary Devices | Yes |
Core Features & Market Positioning
The Siemens 5SY6302-8CC stands out in the industrial protection market due to its reliability and the strong reputation of the Siemens SENTRON product line. Its C-curve tripping characteristic makes it ideal for applications where inrush currents are common, such as motor starts, providing enhanced protection against nuisance tripping while still offering robust short-circuit protection. The high breaking capacity of 30 kA (IEC 60947-2) positions it as a dependable choice for installations requiring significant fault current interruption capability. Furthermore, its halogen-free and silicon-free construction aligns with modern industrial safety and environmental standards, enhancing its market appeal in sensitive applications and regions with stringent regulations. The ability to install supplementary devices broadens its functionality, allowing for customization and advanced control integration.
Key Application Scenarios
This Siemens 5SY6302-8CC 3P 2A circuit breaker is specifically engineered for safeguarding individual motors and small electrical circuits in various industrial and infrastructure settings. Common applications include protection for pumps, fans, conveyor systems, machine tools, and other inductive loads where reliable motor protection is paramount. Its 2A rating makes it suitable for smaller motor sizes or control circuits requiring precise overcurrent protection. The robust construction and C-curve tripping characteristic ensure dependable operation in environments with fluctuating load demands, preventing downtime and protecting valuable equipment from damage caused by overloads or short circuits.
Practical System Integration Guidance
Integrating the Siemens 5SY6302-8CC into existing or new control panels is straightforward, owing to its standard 70 mm mounting depth and compatibility with DIN rail mounting systems. The device features top and bottom terminal connections, offering flexibility during installation. For optimal performance and safety, it is crucial to ensure that all conductors are securely terminated within the IP20-rated terminals. While this model does not include neutral conductor switching, it can be effectively utilized in three-phase systems. Users should adhere to the general safety guidelines for electrical installations, ensuring that the circuit breaker is correctly sized for the protected load and that the ambient conditions comply with Siemens' recommendations. The ability to attach supplementary devices, such as auxiliary contacts or trip units, allows for advanced monitoring and control integration within larger automation systems.
Operation and Risk Mitigation
The Siemens 5SY6302-8CC operates automatically, interrupting the circuit when an overcurrent or short circuit condition is detected, thereby preventing damage to connected equipment and mitigating fire hazards. The C-curve characteristic ensures that the breaker will trip between 5 to 10 times the rated current, providing a balance between protection and tolerance for motor starting currents. In the event of a trip, the breaker's handle will move to the OFF position. To reset the breaker, first identify and rectify the cause of the overload or short circuit, then firmly push the handle to the ON position. It is imperative that only qualified personnel perform installation, operation, and maintenance, following the safety warnings provided by Siemens to prevent electrical shock or equipment damage. Proper use and adherence to the specified operating conditions are essential for long-term reliability and safety.
Scalability & Long-Term Value
The Siemens 5SY6302-8CC offers significant long-term value through its compatibility with the broader Siemens SENTRON range and its capacity for integration into advanced industrial control systems. Its design allows for the addition of supplementary devices, such as remote signaling modules or shunt trip units, enabling enhanced system monitoring and control, which is crucial for IIoT-enabled facilities. This future-proofs installations by allowing for upgrades and expansions without requiring complete replacement of the core protection devices. For applications demanding higher levels of automation and data integration, the 5SY6302-8CC can be a key component within a comprehensive Siemens industrial automation solution, contributing to operational efficiency and predictive maintenance strategies.
Frequently Asked Questions
What is the tripping characteristic of the Siemens 5SY6302-8CC?
The Siemens 5SY6302-8CC features a Type C tripping characteristic. This means it is designed to trip when the current reaches 5 to 10 times the rated current.
This characteristic is particularly useful for protecting inductive loads, such as motors, which often experience temporary high inrush currents during startup. It helps prevent nuisance tripping while still providing adequate protection against overloads and short circuits.
Type C breakers are a common choice for motor protection and distribution circuits where such temporary current surges are expected.
What is the breaking capacity of the Siemens 5SY6302-8CC?
The Siemens 5SY6302-8CC has a breaking capacity of 6 kA according to EN 60898 and a higher rating of 30 kA according to IEC 60947-2.
This signifies its ability to safely interrupt fault currents without sustaining damage. The IEC 60947-2 rating is particularly important for industrial applications with higher potential fault levels.
A higher breaking capacity ensures greater safety and reliability in the event of a severe short circuit.
Can the Siemens 5SY6302-8CC be used for single-phase applications?
While the Siemens 5SY6302-8CC is a three-pole (3P) breaker, it can be used in single-phase applications by energizing only one or two poles, provided the system configuration allows and it is appropriately rated.
However, it is primarily designed for three-phase systems where all three poles are utilized to protect three-phase motors or circuits. Using it for single-phase loads might be an over-specification or require specific wiring configurations.
For dedicated single-phase protection, a single-pole or two-pole breaker of the appropriate rating is generally recommended for optimal efficiency and cost-effectiveness.
What is the rated operational current for the Siemens 5SY6302-8CC?
The rated operational current for the Siemens 5SY6302-8CC is 2A. This is the maximum continuous current the breaker can safely handle under specified operating conditions.
It is crucial to select a circuit breaker with a rated current that matches or is slightly above the continuous operating current of the load it is protecting to ensure effective overcurrent protection.
Operating the breaker at higher ambient temperatures will reduce its effective current carrying capacity, as noted in its specifications.
What are the dimensions of the Siemens 5SY6302-8CC?
The Siemens 5SY6302-8CC has a standard width of 70 mm for its pole modules, fitting within typical control panel layouts. Its exact dimensions are approximately 94.00 x 58.00 x 84.00 mm (height x width x depth).
This compact size allows for efficient space utilization within electrical enclosures and switchboards, making it a practical choice for densely populated control systems.
The 70 mm dimension often refers to the pole width, which is a standard for many modular circuit breakers, facilitating easy replacement and installation.
How does the C-curve characteristic protect motors?
The C-curve tripping characteristic is beneficial for motor protection because it allows for temporary inrush currents of 5 to 10 times the rated current. Motors experience higher currents during startup, and a C-curve breaker tolerates these surges.
This prevents unnecessary tripping during normal motor operation, ensuring continuous power to the machinery. The breaker will still trip if the current exceeds this range significantly, indicating an overload or fault.
Without this characteristic, a motor might cause a standard breaker to trip every time it starts, leading to production interruptions.
Is the Siemens 5SY6302-8CC suitable for industrial applications?
Yes, the Siemens 5SY6302-8CC is highly suitable for industrial applications, particularly for motor protection. Its robust construction, high breaking capacity, and C-curve tripping characteristic are designed for demanding industrial environments.
It offers reliable protection against overcurrents and short circuits, which are common concerns in industrial settings with heavy machinery and fluctuating loads. The breaker is rated for infrastructure and industrial use.
The product's durability and adherence to industrial standards ensure dependable operation and safety in critical industrial processes.
What is the voltage rating of the Siemens 5SY6302-8CC?
The Siemens 5SY6302-8CC has a rated operating voltage of 400V AC and an insulation voltage (Ui) of 440V. It is also suitable for DC operation with a maximum rated voltage of 72V.
This makes it versatile for use in standard industrial power systems operating at 400V. It can also be used in control circuits or specific DC applications within its voltage limits.
Always ensure the voltage of your system is within the specified limits of the circuit breaker to guarantee safe and effective operation.
Can supplementary devices be attached to the Siemens 5SY6302-8CC?
Yes, the Siemens 5SY6302-8CC is designed to allow for the installation of supplementary devices. These can include auxiliary contacts for signaling or remote indication, and shunt trip units for remote tripping capabilities.
This expandability enhances the breaker's functionality, enabling it to be integrated into more complex control and monitoring systems. It allows for greater automation and remote management of electrical circuits.
The ability to add accessories provides a degree of scalability and customization for specific application requirements.
What is the protection class (IP rating) of the Siemens 5SY6302-8CC?
The Siemens 5SY6302-8CC has an IP20 protection class rating when conductors are connected. This means it is protected against solid objects greater than 12.5 mm in size and has no protection against water.
Therefore, it is suitable for installation within enclosures or control cabinets where it is shielded from direct contact and environmental elements.
For applications requiring higher ingress protection, it must be installed within a suitable enclosure that meets the necessary IP rating.
