Siemens 5SU9356-7KK63 Double Pole Main Protection RCBO 63A 30mA 1P+N C
The Siemens 5SU9356-7KK63 is a cutting-edge Double Pole Main Protection RCBO, engineered for superior safety and reliability in electrical installations. This 63A, 30mA unit, featuring a Type C tripping characteristic, offers essential protection against overcurrents and earth faults, safeguarding both equipment and personnel. Its compact design and advanced tripping technology make it an ideal solution for modern power distribution systems, providing robust defense in demanding industrial and commercial environments.
Product Specifications
| Feature | Specification |
| :---------------- | :----------------------------------------------- |
| Product Type | RCBO (Residual Current Circuit Breaker with Overcurrent Protection) |
| Manufacturer | Siemens |
| Model Number | 5SU9356-7KK63 |
| Poles | Double Pole (1P+N) |
| Rated Current | 63A |
| Rated Residual Operating Current | 30mA |
| Tripping Curve | Type C |
| Breaking Capacity | 10kA |
| Voltage Rating | 230/400V AC |
| Frequency | 50/60 Hz |
| Terminal Type | Screw Terminals |
| Mounting | DIN Rail |
| IP Protection | IP20 |
Core Features & Market Positioning
The Siemens 5SU9356-7KK63 distinguishes itself through its comprehensive protection capabilities, combining residual current and overcurrent protection within a single, space-saving device. This integration simplifies panel building and reduces installation complexity, a significant advantage in competitive electrical markets. Its robust construction and adherence to stringent international standards, such as IEC 61009, underscore its reliability and suitability for critical infrastructure. The Type C tripping curve ensures it is well-suited for applications with moderate inrush currents, such as motors and lighting circuits, without nuisance tripping. Siemens' reputation for quality and innovation further solidifies the 5SU9356-7KK63's position as a preferred choice for professionals seeking high-performance circuit protection.
Key Application Scenarios
This RCBO is ideally suited for main protection in residential, commercial, and light industrial applications where a single point of protection is required for a distribution circuit. It is commonly deployed in sub-distribution boards and as a main incoming breaker to provide essential safety against electric shock due to indirect contact and fire hazards caused by earth faults. The 30mA sensitivity is standard for personal protection, while the 63A rating supports higher load circuits, and the Type C characteristic accommodates inductive loads like small motors, transformers, and certain lighting systems commonly found in building services and manufacturing environments.
Practical System Integration Guidance
Integrating the Siemens 5SU9356-7KK63 into existing or new electrical systems is straightforward due to its standard DIN rail mounting and familiar terminal configurations. Ensure the incoming live and neutral conductors are connected to the respective line terminals, and the outgoing protected conductors are connected to the load terminals. Proper torque must be applied to the screw terminals to ensure a secure connection and prevent overheating. For circuits requiring residual current protection, this RCBO functions as the primary protective device, eliminating the need for separate RCDs and MCBs for the same circuit. Always follow local wiring regulations and consult the manufacturer's installation manual for detailed schematics and safety precautions.
Operation and Risk Mitigation
The 5SU9356-7KK63 RCBO operates by continuously monitoring the balance of current flowing through the live and neutral conductors. If an imbalance (indicating a fault current to earth) exceeding 30mA is detected, the device will trip, interrupting the circuit within milliseconds to prevent electric shock. The overcurrent protection feature, governed by the Type C curve, protects against overload and short-circuit conditions by tripping at a higher multiple of its rated current. Risk mitigation is inherent in its design; however, regular testing of the residual current function via the integrated test button is crucial to ensure its operational readiness. Avoid operating the test button under load.
Scalability & Long-Term Value
As part of Siemens' extensive portfolio of low-voltage protection devices, the 5SU9356-7KK63 offers excellent compatibility with other Siemens circuit breakers, switchgear, and distribution boards. This ensures a cohesive and scalable electrical system, allowing for easy expansion or modification as needs evolve. While not directly an IIoT-enabled device, its integration into a well-designed distribution system facilitates the implementation of smart monitoring solutions at higher levels of the electrical infrastructure. The inherent durability and reliability of Siemens products contribute to long-term value by minimizing downtime and maintenance requirements.
Frequently Asked Questions
What is the primary function of the Siemens 5SU9356-7KK63?
This RCBO primarily provides combined protection against overcurrents (overloads and short circuits) and earth leakage faults. It ensures electrical safety by disconnecting power when dangerous current imbalances are detected.
How does the 30mA sensitivity protect users?
The 30mA residual operating current is a critical safety threshold for personal protection against electric shock. It trips quickly enough to prevent serious injury or fatality if a person becomes a path for fault current.
What does the "Type C" tripping curve signify?
A Type C curve indicates that the RCBO will trip at higher multiples of its rated current compared to Type B or A. This makes it suitable for circuits with moderate inductive loads that may have higher inrush currents, such as small motors or lighting ballasts.
Can the Siemens 5SU9356-7KK63 be used as a main switch?
Yes, its double-pole design and combined protection features make it suitable for use as a main protection device for incoming circuits in distribution boards. It offers comprehensive safety at the point of supply.
What is the breaking capacity of this RCBO?
The Siemens 5SU9356-7KK63 has a breaking capacity of 10kA. This signifies its ability to safely interrupt fault currents up to 10,000 Amperes without sustaining damage.
Is this RCBO suitable for residential or industrial use?
This RCBO is versatile and suitable for both residential and commercial applications, as well as light industrial settings. Its 63A rating and Type C curve are well-suited for various building and facility power distribution needs.
How often should the test button on the RCBO be used?
It is recommended to test the residual current function of the RCBO monthly using the integrated test button. This ensures the sensitive earth fault detection mechanism is functioning correctly.
What are the advantages of a Double Pole (1P+N) RCBO?
A double-pole RCBO disconnects both the live and neutral conductors simultaneously. This provides enhanced safety by ensuring complete isolation of the circuit from the power supply during fault conditions.
How does this RCBO differ from a standard MCB?
Unlike a standard MCB which only protects against overcurrents, an RCBO integrates residual current protection. This dual functionality provides a more comprehensive safety solution by protecting against earth faults and electric shock.
What is the significance of the IP20 rating?
The IP20 rating means the device is protected against solid objects larger than 12.5mm (like a finger) but has no protection against water ingress. It is suitable for installation within enclosures where environmental protection is managed.
