Siemens 5SU1356-1KK13 Single-Phase Residual Current Circuit Breaker 13A 30mA 1P+N C

The Siemens 5SU1356-1KK13 is a highly reliable single-phase residual current circuit breaker (RCCB) designed for robust electrical protection. This 13A, 30mA device, featuring a 1P+N (single pole plus neutral) configuration and a C-type tripping characteristic, offers superior safety and operational continuity in various electrical installations. Its primary advantages lie in its sensitive fault detection, preventing electrical shocks and fire hazards, coupled with its durable construction for long-term industrial and commercial use. The C-curve ensures it can handle moderate inrush currents without nuisance tripping, making it ideal for circuits with inductive loads.

Product Specifications

| Feature                   | Specification                                     |

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

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

| Manufacturer              | Siemens                                           |

| Model Number              | 5SU1356-1KK13                                     |

| Rated Current             | 13A                                               |

| Rated Residual Current    | 30mA                                              |

| Poles                     | 1P+N (Single Pole + Neutral)                      |

| Tripping Characteristic   | Type C                                            |

| Voltage Rating            | 230/240V AC                                       |

| Breaking Capacity (Icn)   | 10kA                                              |

| Frequency                 | 50/60 Hz                                          |

| Terminal Type             | Screw Terminals                                   |

| Mounting Type             | DIN Rail (35mm)                                   |

| Degree of Protection      | IP20 (enclosure), IP40 (switch handle)            |

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

| Compliance Standards      | IEC/EN 61009-1, IEC/EN 61009-2-1                  |

Core Features & Market Positioning

The Siemens 5SU1356-1KK13 stands out in the competitive landscape due to its advanced residual current detection technology, offering enhanced safety beyond basic overcurrent protection. Its robust design, a hallmark of Siemens industrial products, ensures consistent performance and a prolonged service life, minimizing maintenance downtime. The C-type tripping curve is a key differentiator, providing superior compatibility with equipment that exhibits higher inrush currents, such as motors and transformers, without compromising on sensitive earth fault protection. This combination positions the 5SU1356-1KK13 as a premium choice for applications demanding both high safety standards and operational reliability, differentiating it from basic residual current devices.

Key Application Scenarios

This Siemens RCCB is ideally suited for protecting circuits in residential, commercial, and light industrial settings where personnel safety is paramount. Common applications include protecting socket outlets, lighting circuits, and circuits supplying appliances with moderate inductive loads. Its 13A rating and 30mA sensitivity make it a critical component for preventing electric shock in areas prone to moisture, such as kitchens and bathrooms, or in workshops where power tools are frequently used. The 1P+N configuration simplifies wiring in single-phase systems by simultaneously switching both the live and neutral conductors, ensuring complete isolation during fault conditions or maintenance.

Practical System Integration Guidance

Integrating the Siemens 5SU1356-1KK13 into existing or new electrical systems is straightforward due to its standard DIN rail mounting and screw terminal connections. For installation, ensure the main power supply is disconnected. The line (input) terminals should be connected to the incoming power source, typically marked with an 'L' for live and 'N' for neutral. The load (output) terminals connect to the protected circuit. It is crucial to connect the neutral conductor correctly; typically, the neutral wire from the supply connects to the 'N' terminal on the RCCB, and the neutral wire for the load connects to the corresponding 'N' output terminal. The live wire follows the same input-to-output path. Always refer to the manufacturer's wiring diagram and local electrical codes for precise installation procedures. Ensure adequate clearance around the device for ventilation.

Operation and Risk Mitigation

The primary function of the Siemens 5SU1356-1KK13 is to detect residual currents—imbalances between live and neutral conductors that indicate current leakage to earth, often caused by insulation faults or contact with live parts. When a residual current exceeding 30mA is detected, the RCCB rapidly interrupts the circuit, typically within milliseconds, thereby mitigating the risk of electric shock and fire. The device is equipped with a test button (usually marked 'T') for regular functional checks. Pressing this button simulates a fault condition, causing the breaker to trip. It is recommended to test the RCCB monthly to ensure its operational readiness. If the device trips unexpectedly, it signifies a fault in the protected circuit; troubleshooting should involve isolating sections of the circuit to identify the source of the leakage.

Scalability & Long-Term Value

The Siemens 5SU1356-1KK13 offers excellent long-term value through its compatibility with the broader Siemens SENTRON series of switchgear and protection devices. This allows for seamless integration into larger electrical distribution boards and building management systems. Its robust construction ensures a long operational lifespan, reducing the need for frequent replacements. While this specific model is designed for single-phase applications, its inclusion within a system using Siemens components allows for potential upgrades or expansion of protection schemes using compatible three-phase RCCBs or other intelligent protection relays from the same manufacturer. The inherent reliability of Siemens industrial components translates to reduced operational risks and sustained system integrity over time.

FAQs

What is the primary purpose of the Siemens 5SU1356-1KK13 RCCB?

This device provides crucial protection against electric shock and fire hazards. It detects residual currents, swiftly disconnecting power when leakage is detected.

It is designed for single-phase applications, offering enhanced safety for circuits with moderate inrush currents due to its C-type characteristic.

The 13A rating and 30mA sensitivity make it suitable for residential, commercial, and light industrial uses, safeguarding personnel and equipment.

How does the C-type tripping characteristic benefit this RCCB?

The C-type curve allows for higher inrush currents without nuisance tripping. This is vital for circuits with inductive loads like motors or transformers.

It ensures stable operation in environments where temporary overcurrents are expected during equipment startup.

This feature balances sensitive earth fault protection with the reliability needed for industrial and commercial applications.

What are the key technical specifications of the Siemens 5SU1356-1KK13?

It is a 13A, 30mA single-phase (1P+N) residual current circuit breaker. It operates at 230/240V AC and has a breaking capacity of 10kA.

The device conforms to IEC/EN 61009 standards, ensuring high quality and safety compliance. Its operating temperature range is -25°C to +45°C.

Standard features include DIN rail mounting, screw terminals, and IP20 protection, facilitating easy installation and integration.

Where is the Siemens 5SU1356-1KK13 typically installed?

This RCCB is commonly installed in main distribution boards or sub-distribution boards. It protects specific circuits requiring high safety levels.

Ideal locations include circuits for socket outlets, lighting, and appliances, especially in areas like kitchens, bathrooms, or workshops.

Its 1P+N configuration is perfect for single-phase systems where both live and neutral require switching for complete isolation.

How do I properly wire the Siemens 5SU1356-1KK13?

Connect the incoming live and neutral power supply to the designated line terminals. Ensure correct polarity.

Connect the outgoing live and neutral wires for the protected circuit to the load terminals. Double-check all connections.

Always disconnect the main power before wiring and consult the official wiring diagram and local electrical regulations.

What is the significance of the 30mA residual current rating?

A 30mA rating indicates the device will trip when it detects a very small current leakage to earth. This level is considered the threshold for preventing severe electric shock to humans.

This sensitivity is crucial for personal protection devices, making it a standard for general-purpose circuits.

It effectively safeguards against indirect contact (faults within equipment) and direct contact (accidental touching of live parts).

How often should the test button on the Siemens 5SU1356-1KK13 be used?

The test button should be used regularly to verify the RCCB's functionality. Monthly testing is the generally recommended practice.

Pressing the test button simulates a fault condition, confirming the tripping mechanism is operational. This is a vital safety check.

Regular testing ensures the device will perform as expected when a real fault occurs, maintaining a high level of electrical safety.

What does it mean if the Siemens 5SU1356-1KK13 trips frequently?

Frequent tripping indicates a persistent earth leakage fault within the protected circuit or connected appliances. It is a safety feature preventing potential hazards.

Troubleshooting is required. Isolate appliances one by one or divide the circuit into sections to pinpoint the source of the leakage.

Do not simply reset the breaker repeatedly without identifying and rectifying the fault; this could be dangerous.

Is the Siemens 5SU1356-1KK13 compatible with other Siemens electrical components?

Yes, it is part of the Siemens SENTRON series, ensuring compatibility with other Siemens switchgear and protection devices. This facilitates system integration.

It can be easily incorporated into larger Siemens-based electrical distribution systems or building management solutions.

This compatibility ensures consistent performance and allows for future system expansion or upgrades using trusted Siemens products.

What is the breaking capacity (Icn) of this RCCB?

The breaking capacity (Icn) of the Siemens 5SU1356-1KK13 is 10kA. This refers to the maximum fault current the device can safely interrupt.

A 10kA rating is generally sufficient for most residential and commercial applications, providing robust protection against severe short circuits.

This specification ensures the device can safely clear high fault currents without sustaining damage, maintaining system integrity.