Siemens 5SU9356-2CN63 High Breaking Capacity RCBO 63A 30mA 1P+N D
The Siemens 5SU9356-2CN63 is a high-performance Residual Current Circuit Breaker with Overcurrent protection (RCBO) designed for robust electrical safety in demanding industrial and commercial environments. This 63A, 30mA, 1-pole + neutral device offers advanced protection against electric shock, fire hazards caused by earth faults, and overcurrents. Its key advantages include a high breaking capacity ensuring reliable circuit interruption under fault conditions, precise 30mA residual current sensitivity for enhanced personal protection, and a D-curve tripping characteristic for handling high inrush currents often found in inductive loads.
Siemens 5SU9356-2CN63 RCBO: Comprehensive Specifications
| Parameter | Specification |
| :----------------------------- | :------------------------ |
| Product Type | RCBO |
| Manufacturer | Siemens |
| Model Number | 5SU9356-2CN63 |
| Rated Current (In) | 63 A |
| Residual Current (IΔn) | 30 mA |
| Number of Poles | 1P + N (1 Pole + Neutral) |
| Tripping Characteristic | Type D |
| Breaking Capacity (Icn) | 6 kA |
| Rated Voltage (Un) | 230/240 V AC |
| Frequency | 50/60 Hz |
| Insulation Voltage (Ui) | 400 V AC |
| Surge Current withstand (Iimp) | 6 kA |
| Terminal Type | Screw Terminals |
| Mounting Type | DIN Rail |
| Operating Temperature Range | -25°C to +45°C |
| Degree of Protection (IP) | IP20 |
Core Features and Market Positioning
The Siemens 5SU9356-2CN63 distinguishes itself through its integration of Residual Current Device (RCD) and Miniature Circuit Breaker (MCB) functions into a single, compact unit. This dual protection significantly simplifies panel wiring and reduces installation space compared to using separate RCDs and MCBs. The Type D tripping characteristic is particularly valuable for applications involving motors, transformers, and heavy machinery, where high starting currents could otherwise cause nuisance tripping of standard B or C curve breakers. This positions the 5SU9356-2CN63 as a premium solution for critical industrial circuits requiring both sensitive earth fault protection and robust overload/short-circuit handling. Its high breaking capacity of 6kA ensures it can safely interrupt fault currents in systems with substantial fault levels, providing a crucial layer of safety and operational reliability.
Key Application Scenarios
This Siemens RCBO is ideally suited for protecting circuits in industrial facilities, manufacturing plants, and commercial buildings where safety and operational continuity are paramount. Common applications include safeguarding motor control circuits, pump systems, large lighting installations, and any equipment with significant inductive loads that exhibit high inrush currents. Its 30mA sensitivity makes it an effective device for preventing electric shock in areas with increased risk, such as workshops or areas with conductive flooring. The 63A rating is appropriate for main distribution circuits or protecting larger single-phase loads.
Practical System Integration Guidance
Integrating the Siemens 5SU9356-2CN63 into existing electrical systems is straightforward due to its standard DIN rail mounting and conventional terminal design. Ensure the upstream supply voltage and frequency match the device's ratings (230/240 V AC, 50/60 Hz). Connect the line conductor to the designated line terminal and the neutral conductor to the neutral terminal. The load conductors should then be connected to their respective terminals. Proper grounding of the system is essential for the RCBO's earth fault detection to function correctly. Before energizing, verify all connections are secure and correctly phased. A test button is typically integrated for periodic functional checks, ensuring the residual current detection mechanism is operational.
Operation and Risk Mitigation
The 5SU9356-2CN63 operates by continuously monitoring the current balance between the live and neutral conductors. If an imbalance exceeding 30mA occurs, indicating a potential earth fault or leakage current, the RCBO rapidly trips, disconnecting the circuit. This protects personnel from dangerous electric shock and mitigates the risk of fires caused by persistent earth leakage. The overcurrent protection, characterized by the Type D curve, trips at approximately 10-20 times the rated current, offering robust protection against short circuits and sustained overloads. In the event of a trip, identify the cause of the fault (earth leakage or overload) before resetting the device. Do not force the breaker reset if the fault condition persists, as this can damage the device and compromise safety.
Scalability and Long-Term Value
As part of Siemens' extensive industrial electrical product portfolio, the 5SU9356-2CN63 RCBO offers excellent compatibility with other Siemens components, facilitating seamless integration into larger control and distribution systems. Its robust construction and adherence to stringent international standards ensure a long operational lifespan, providing reliable protection for years. While this specific unit is a fixed rating, Siemens offers a range of similar RCBOs and MCBs with varying current ratings and tripping characteristics, allowing for system expansion or modification as electrical demands evolve. For advanced monitoring and integration with digital platforms, consider pairing these devices with compatible Siemens energy meters or communication modules within a broader Industry 4.0 framework.
Frequently Asked Questions
What is the primary function of a Siemens 5SU9356-2CN63 RCBO?
The primary function is to provide combined protection against electric shock and fire hazards. It detects earth faults with its 30mA residual current sensitivity. It also protects against overloads and short circuits with its high breaking capacity.
How does the 30mA sensitivity protect users?
The 30mA residual current setting is sensitive enough to trip before dangerous current levels can pass through a human body. This significantly reduces the risk of severe injury or electrocution from earth leakage faults.
What does the 'D' in the tripping characteristic signify?
The 'D' characteristic means this RCBO is designed for high inrush currents. It trips at 10-20 times the rated current, making it suitable for inductive loads like motors and transformers.
Can the Siemens 5SU9356-2CN63 be used for general domestic installations?
While it offers excellent protection, its 63A rating and Type D curve are typically suited for industrial or heavy commercial applications. Domestic use usually involves lower current ratings and Type B or C characteristics.
What is the breaking capacity of this RCBO?
This RCBO has a breaking capacity of 6kA. This means it can safely interrupt a fault current of up to 6000 amperes.
Is this a single-pole or double-pole device?
The 5SU9356-2CN63 is a 1-pole + Neutral device. This means it switches and protects both the live and neutral conductors simultaneously.
What type of load is best suited for a Type D tripping curve?
Type D is ideal for circuits supplying equipment with high starting or inrush currents. This includes large electric motors, transformers, and certain types of welding equipment.
How do I reset the Siemens 5SU9356-2CN63 after it trips?
To reset, first identify and rectify the cause of the trip (overload or earth fault). Then, push the operating lever fully up to the 'ON' position.
What is the rated voltage and frequency for this RCBO?
The rated voltage is 230/240 Volts AC, and it is designed for use with a frequency of 50 or 60 Hertz. Always ensure your system matches these specifications.
Where can this RCBO be installed in an electrical panel?
It is designed for standard 35mm DIN rail mounting. Ensure it is installed in a suitable enclosure with adequate ventilation and protection from environmental elements.
