Siemens 5SU1656-7KK13 Double Pole Earth Leakage Switch RCCB 13A 300mA 1P+N C

The Siemens 5SU1656-7KK13 is a high-performance double-pole earth leakage switch (RCCB) designed for robust protection in demanding industrial and commercial environments. This 13A, 300mA, 1P+N device offers crucial safety by detecting residual currents and rapidly disconnecting power, thereby preventing electrical shocks and mitigating fire hazards. Its C-curve tripping characteristic ensures reliable operation by tolerating inrush currents without nuisance tripping, making it suitable for circuits with inductive loads. The Siemens 5SU1656-7KK13 stands out for its compact design, ease of installation, and adherence to stringent international safety standards, positioning it as a dependable solution for safeguarding personnel and equipment.

Product Specifications

| Specification                  | Value                               |

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

| Product Type                   | Earth Leakage Switch (RCCB)         |

| Manufacturer                   | Siemens                             |

| Model Number                   | 5SU1656-7KK13                       |

| Poles                          | Double Pole (1P+N)                  |

| Rated Current (In)             | 13A                                 |

| Rated Residual Current (IΔn)   | 300mA                               |

| Tripping Characteristic (Type) | C                                   |

| Breaking Capacity (Icn)        | 10kA                                |

| Voltage Rating                 | 230/400V AC                         |

| Frequency                      | 50/60 Hz                            |

| Insulation Voltage             | 500V                                |

| Degree of Protection           | IP20                                |

| Terminal Type                  | Screw Terminals                     |

| Mounting Type                  | DIN Rail (35mm)                     |

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

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

| Dimensions (H x W x D)         | 90mm x 36mm x 70mm (approx.)        |

Core Features & Market Positioning

The Siemens 5SU1656-7KK13 distinguishes itself through its reliable dual-pole switching, ensuring both phase and neutral conductors are interrupted simultaneously during a fault. This is a critical safety feature, especially in systems where neutral conductors might carry current. Its 300mA residual current sensitivity is optimized for fire protection applications, offering a higher level of safety than standard 30mA devices in certain scenarios. The C-curve tripping characteristic is a significant advantage for industrial settings, as it accommodates the transient currents often encountered with motors and transformers without causing unnecessary disconnections. This product is positioned as a robust, dependable, and compliant solution for critical power distribution where safety and operational continuity are paramount.

Key Application Scenarios

This 13A, 300mA double-pole earth leakage switch is ideally suited for protecting circuits in commercial buildings, industrial facilities, and workshops where inductive loads are prevalent. Common applications include power circuits for machinery, pumps, ventilation systems, and control panels. It is also highly effective in safeguarding fixed installations where the risk of fire due to persistent earth faults exists, such as in areas with older wiring or where equipment is subjected to harsh conditions. The 1P+N configuration makes it suitable for single-phase systems requiring complete disconnection of both live conductors.

Practical System Integration Guidance

Integrating the Siemens 5SU1656-7KK13 is straightforward due to its standard DIN rail mounting and accessible screw terminals. For proper installation, ensure the incoming phase and neutral conductors are connected to the designated terminals (typically marked L and N respectively) and the outgoing load connections are made accordingly. The earth connection from the system grounding conductor should be terminated at the main distribution board's earth bar, not directly to the RCCB. It is crucial to verify that the incoming voltage and frequency match the device's specifications. Always follow local electrical codes and regulations during installation. For circuits with higher inrush currents, ensure the C-curve characteristic is appropriate and that the breaking capacity (10kA) meets the prospective fault current at the point of installation.

Operation and Risk Mitigation

The Siemens 5SU1656-7KK13 operates by continuously monitoring the balance of current flowing through the phase and neutral conductors. If an imbalance, indicative of current leaking to earth, exceeds the 300mA threshold, the internal mechanism triggers a rapid disconnection of both poles. This significantly reduces the risk of electric shock, which can occur if a person comes into contact with an energized component and an earth return path. It also mitigates the risk of fire damage caused by arcing or overheating associated with earth faults. Regular testing of the RCCB using its integrated test button (typically labeled 'T') is essential to ensure its operational integrity. This test should be performed periodically as per site safety protocols.

Scalability & Long-Term Value

As part of Siemens' extensive range of low-voltage protection devices, the 5SU1656-7KK13 offers excellent compatibility with other Siemens circuit breakers, busbars, and distribution boards, facilitating seamless integration into existing or expanding electrical infrastructure. While this specific model is a standalone RCCB, its performance and reliability contribute to long-term operational value by minimizing downtime and preventing costly damage from electrical faults. For future upgrades or integration into smart grid or IIoT environments, consider complementing this device with compatible residual current monitoring relays or smart meters that can provide data logging and remote signaling capabilities, enhancing overall system intelligence and predictive maintenance potential.

Frequently Asked Questions

What is the primary function of the Siemens 5SU1656-7KK13?

The Siemens 5SU1656-7KK13 is an earth leakage switch. It detects and interrupts dangerous residual currents to prevent electric shock and fires.

It's a double-pole device, meaning it disconnects both the phase and neutral conductors simultaneously. This ensures complete isolation of the circuit under fault conditions.

Its 300mA sensitivity is particularly suited for fire protection applications in various settings.

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

The C-curve tripping characteristic allows the Siemens 5SU1656-7KK13 to handle higher inrush currents. This is common with inductive loads like motors and transformers.

It prevents nuisance tripping, ensuring operational continuity for equipment that experiences temporary current surges. The device will still trip for genuine earth faults.

This makes it an excellent choice for industrial and commercial applications where equipment startup can cause significant, short-duration current spikes.

Can the Siemens 5SU1656-7KK13 be used for general domestic wiring?

While technically capable, the 300mA sensitivity of the Siemens 5SU1656-7KK13 is generally higher than typically required for domestic personal protection (usually 30mA).

For domestic safety, 30mA RCCBs are standard for protecting against electric shock to persons. The 300mA rating is primarily for fire protection.

It's advisable to consult local regulations and electrical standards to determine the appropriate RCCB sensitivity for specific domestic installations.

What are the key technical parameters for the 5SU1656-7KK13?

Key parameters include a rated current of 13A and a rated residual current of 300mA. It features a double-pole (1P+N) configuration.

The device operates at 230/400V AC and has a breaking capacity of 10kA. Its tripping characteristic is type C.

It is designed for 50/60 Hz frequency and features IP20 protection, suitable for DIN rail mounting.

What is the significance of the 300mA residual current rating?

The 300mA rating signifies the maximum earth leakage current that the switch will tolerate before tripping. This level is primarily intended for fire protection.

It helps to prevent fires that could be caused by persistent, low-level earth faults that might not be sufficient to trip a 30mA device. This is crucial in industrial environments.

However, for direct personal protection against electric shock, a lower sensitivity (e.g., 30mA) is usually recommended according to safety standards.

How is the Siemens 5SU1656-7KK13 installed in a distribution board?

Installation involves snapping the double-pole RCCB onto a standard 35mm DIN rail within the distribution board.

Incoming phase and neutral power supply conductors are connected to the designated input terminals, and outgoing load conductors are connected to the output terminals.

Ensure all connections are tight and that the device is correctly oriented according to manufacturer instructions and local electrical codes.

What does "1P+N" mean in the product description?

"1P+N" stands for 1 Pole + Neutral. This indicates that the Siemens 5SU1656-7KK13 is a double-pole device that switches both the live (phase) conductor and the neutral conductor.

Simultaneous switching of both conductors ensures complete isolation of the circuit when the RCCB trips. This is a vital safety feature for system integrity.

This configuration is common in single-phase AC power distribution systems where both phase and neutral require protection and disconnection.

How can I test the functionality of this RCCB?

The Siemens 5SU1656-7KK13 typically has an integrated test button, often labeled 'T' or 'TEST'. Pressing this button simulates an earth fault.

When the test button is pressed, the RCCB should trip, indicating that its internal protection mechanism is functioning correctly. This test should be performed regularly.

After testing, reset the device by pushing the main lever back to the 'ON' position, provided there are no ongoing faults in the circuit.

What are the environmental operating conditions for this RCCB?

The Siemens 5SU1656-7KK13 is designed for operation within a temperature range of -25°C to +45°C. It also has an insulation voltage rating of 500V.

The device offers IP20 degree of protection, meaning it is protected against solid objects greater than 12.5mm but not against water. It should be installed in a suitable enclosure.

Ensure the installation environment is free from excessive moisture, dust, and corrosive substances to maintain optimal performance and longevity.

What standards does the Siemens 5SU1656-7KK13 comply with?

This RCCB complies with key international safety and performance standards for residual current devices. These include IEC/EN 61009-1 and IEC/EN 61009-2-1.

Adherence to these standards ensures the product meets rigorous requirements for safety, reliability, and interoperability within electrical systems.

Compliance with these recognized standards provides assurance to installers and end-users regarding the product's quality and protective capabilities.