Siemens 5SU1356-1KK10 RCCB Earth Leakage Protection Switch 10A 30mA 1P+N C

The Siemens 5SU1356-1KK10 is a vital component for ensuring electrical safety, offering reliable earth leakage protection with a 10A current rating, 30mA tripping sensitivity, and a 1-pole + neutral configuration. This Residual Current Circuit Breaker (RCCB) is engineered for robust performance in demanding industrial environments, providing essential protection against electric shock and fire hazards caused by insulation faults. Its compact design and Type C tripping characteristic ensure efficient integration into various electrical distribution systems.

Product Specifications

| Feature               | Specification                                |

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

| Product Type          | Residual Current Circuit Breaker (RCCB)      |

| Manufacturer          | Siemens                                      |

| Model Number          | 5SU1356-1KK10                                |

| Rated Current (I_n)   | 10A                                          |

| Rated Residual Current (I_Δn) | 30mA                                         |

| Number of Poles       | 1P + N (1 Pole + Neutral)                    |

| Tripping Characteristic | Type C                                       |

| Voltage Rating        | 230/400V AC (depending on specific variant)  |

| Breaking Capacity     | Typically 6kA or higher (refer to datasheet) |

| Frequency             | 50/60 Hz                                     |

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

| Protection Class      | IP20 (device), IP40 (enclosure)              |

Core Features & Market Positioning

The Siemens 5SU1356-1KK10 RCCB distinguishes itself through its adherence to stringent international safety standards, providing peace of mind for critical installations. Its core advantage lies in its rapid and reliable detection of earth leakage currents, mitigating the risks of electrocution and preventing electrical fires before they escalate. The Type C characteristic makes it suitable for circuits with moderate inrush currents, such as those found in lighting systems or motor loads, without causing nuisance tripping. Siemens' reputation for manufacturing high-quality, durable electrical components further solidifies the 5SU1356-1KK10's market position as a dependable solution for professional electricians and system integrators seeking robust safety equipment.

Key Application Scenarios

This RCCB is ideally suited for a wide array of industrial and commercial applications where enhanced electrical safety is paramount. It is commonly deployed in power distribution boards for manufacturing facilities, workshops, and control cabinets, safeguarding personnel and sensitive equipment. Applications include protecting circuits for machinery, lighting systems, and general power outlets in areas prone to moisture or potential insulation degradation. Its use is critical in installations where the risk of earth faults is elevated, ensuring compliance with electrical safety regulations and minimizing downtime.

Practical System Integration Guidance

Integrating the Siemens 5SU1356-1KK10 into existing or new electrical systems is straightforward due to its standard modular design. The device mounts on a standard DIN rail, allowing for quick installation within distribution boards or enclosures. Proper wiring involves connecting the line conductor to the designated terminal (usually marked "L" or "1") and the neutral conductor to its corresponding terminal (usually marked "N" or "0") on the upstream side. The outgoing load conductors are then connected to the respective terminals on the downstream side. It is imperative to ensure that the neutral conductor is continuously connected through the RCCB to maintain its protective function. Grounding connections are made to the main earthing system separately. Always refer to the manufacturer's wiring diagram for precise connections.

Operation and Risk Mitigation

The primary function of the 5SU1356-1KK10 is to continuously monitor the balance of current flowing in the live and neutral conductors. If an imbalance, indicative of current leaking to earth, exceeds the 30mA threshold, the RCCB rapidly disconnects the circuit, typically within milliseconds. This swift action drastically reduces the duration of potentially dangerous current flow, mitigating the risk of severe electric shock. To mitigate risks, regular testing of the RCCB using its integrated test button is recommended, usually on a monthly basis, to ensure the tripping mechanism remains operational. Avoid overloading circuits beyond the 10A rating, as this can stress the device and potentially lead to premature failure. Ensure correct conductor sizing to prevent overheating.

Scalability & Long-Term Value

The Siemens 5SU1356-1KK10 offers significant long-term value through its compatibility with the broader Siemens SENTRON portfolio of circuit protection devices. This ensures seamless integration with other Siemens components, such as miniature circuit breakers (MCBs) and surge protective devices (SPDs), within a unified electrical distribution architecture. Its robust construction is designed for a long operational lifespan, reducing the need for frequent replacements. While this specific model is designed for direct earth leakage protection, its integration into smart electrical systems can be facilitated through compatible measurement and monitoring modules, aligning with Industry 4.0 initiatives by providing data on system health and performance, though direct IIoT connectivity is not a native feature of this specific RCCB.

Frequently Asked Questions

What is the primary function of the Siemens 5SU1356-1KK10?

This device serves as a Residual Current Circuit Breaker (RCCB). It detects earth leakage faults in electrical circuits. Its main goal is to protect users from electric shock.

It offers a rated current of 10A and a sensitivity of 30mA. This combination is standard for protecting personnel in many environments. The 1P+N configuration means it protects one live and one neutral conductor.

By rapidly interrupting power when leakage occurs, it significantly reduces the risk of electrocution and fire hazards. This makes it a crucial safety component.

How do I correctly wire the Siemens 5SU1356-1KK10?

Connect the incoming live (L) and neutral (N) conductors to the designated terminals on the top. Ensure these are clearly identified on the device. Then, connect the outgoing load conductors to the corresponding terminals below.

The neutral conductor must pass through the RCCB without interruption for it to function. Do not connect the earth (PE) conductor directly to the RCCB terminals. The main earthing system should be connected separately.

Always verify the wiring against the diagram provided by Siemens for the specific model. Incorrect wiring can impair its protective function or cause damage.

What does the 'C' in 5SU1356-1KK10 C mean for its application?

The 'C' denotes the tripping characteristic of the RCCB. This indicates its response to overcurrents caused by inrush currents. Type C breakers are designed to tolerate higher surge currents.

They are suitable for circuits with moderate inductive loads, like motors or lighting. This characteristic prevents nuisance tripping during normal operation of such equipment. It trips when current reaches 5 to 10 times the rated current.

This makes the 5SU1356-1KK10 versatile for applications beyond simple domestic circuits, including light industrial settings.

Can the Siemens 5SU1356-1KK10 be used for surge protection?

No, this RCCB is not designed for surge protection. Its function is specifically to detect and interrupt earth leakage currents. Surge protection requires separate devices like Surge Protective Devices (SPDs).

SPDs are designed to divert transient overvoltages caused by lightning or switching surges. Integrating an SPD upstream or in parallel with the RCCB is recommended for comprehensive protection.

Combining an RCCB with an SPD ensures both personnel safety from earth faults and equipment protection from voltage spikes.

What is the significance of the 30mA rating?

The 30mA (milliamperes) rating refers to the residual current sensitivity. This is the minimum earth leakage current that will cause the RCCB to trip. A 30mA sensitivity is considered the standard for personal protection.

This level of current is generally considered the threshold above which a person can experience severe harm or a fatal electric shock. Rapid disconnection at this level is crucial for safety.

The 30mA rating ensures that the device will activate quickly enough to prevent dangerous physiological effects from electric current passing through the body.

How often should I test the 5SU1356-1KK10 RCCB?

It is recommended to test the RCCB regularly, typically on a monthly basis. Most RCCBs, including this Siemens model, feature a built-in test button for this purpose.

Pressing the test button simulates an earth leakage fault, and the RCCB should immediately trip, disconnecting the circuit. This verifies the functionality of the internal tripping mechanism.

If the device does not trip during the test, it indicates a potential malfunction and it should be replaced by a qualified electrician immediately.

What is the breaking capacity of the 5SU1356-1KK10?

The breaking capacity, often denoted as Icn (rated ultimate short-circuit breaking capacity), is a critical safety parameter. It indicates the maximum fault current the RCCB can safely interrupt without being damaged. For the 5SU1356-1KK10, this is typically rated at 6 kA (kiloamperes).

This breaking capacity is sufficient for most standard residential and light commercial installations where the prospective short-circuit current is below this level. It ensures the device can safely clear fault conditions without failing explosively.

Always confirm the exact breaking capacity for your specific regional variant from the product datasheet, as it can vary. Ensure it is adequate for the installation's fault level.

Is the Siemens 5SU1356-1KK10 suitable for industrial motor control circuits?

The Type C characteristic makes it suitable for circuits with moderate inrush currents, often associated with motor starts. However, for direct protection of large industrial motors, specific motor protection circuit breakers (MPCBs) or appropriately sized thermal-overload relays are generally recommended.

For control circuits powering smaller motors or ancillary equipment within an industrial setting, this RCCB can provide effective personnel protection against earth leakage. It complements other protective devices by adding a layer of safety against indirect contact.

Ensure that the motor's starting current does not consistently exceed the tripping thresholds for nuisance tripping. For high-demand motor applications, consult a qualified electrical engineer.

What are the environmental operating conditions for this RCCB?

The Siemens 5SU1356-1KK10 is designed to operate within a specific temperature range, typically from -25°C to +45°C. It should be installed in a dry environment, protected from direct sunlight and excessive dust.

The device itself has an IP20 protection rating, meaning it is protected against solid objects larger than 12.5mm but not against water. Therefore, it must be installed within an enclosure that provides adequate protection against moisture and other environmental contaminants.

Adhering to these environmental specifications ensures the longevity and reliable performance of the RCCB.

Where can I find a detailed datasheet for the Siemens 5SU1356-1KK10?

Official datasheets and technical documentation are typically available on the Siemens Industry Automation & Drive Technologies website. You can often find these by searching for the exact product model number, "Siemens 5SU1356-1KK10 datasheet".

Distributors and authorized Siemens partners also usually provide access to these detailed technical specifications. These documents contain comprehensive information on electrical characteristics, dimensions, installation instructions, and certifications.

Always refer to the official datasheet for the most accurate and up-to-date technical details specific to your product version.