Siemens 5SV3326-4 RCBO for High Power Equipment 2P 63A 30mA

The Siemens 5SV3326-4 RCBO represents a robust and reliable solution for overcurrent and earth leakage protection, specifically engineered for demanding industrial applications. This 2-pole, 63A, 30mA residual current circuit breaker with overcurrent protection (RCBO) offers a crucial layer of safety and operational continuity for high-power equipment. Its compact design integrates the functions of a miniature circuit breaker (MCB) and a residual current device (RCD) into a single unit, simplifying installation and panel space. The 5SV3326-4 boasts a high breaking capacity, ensuring it can safely interrupt fault currents, and a sensitive 30mA tripping current, providing essential protection against electric shock. Designed for industrial environments, it adheres to stringent international standards, guaranteeing performance and durability.

Product Specifications

| Feature                     | Specification                         |

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

| Product Type                | RCBO (Residual Current Circuit Breaker with Overcurrent Protection) |

| Manufacturer                | Siemens                               |

| Series                      | 5SV3                              |

| Number of Poles             | 2P                                    |

| Rated Current (In)          | 63A                                   |

| Rated Residual Operating Current (IΔn) | 30mA                                  |

| Rated Voltage (Ue)          | 230/400V AC                           |

| Rated Breaking Capacity (Icn) | 6 kA                                  |

| Tripping Characteristic     | B, C, or D (depending on specific variant) |

| Frequency                   | 50/60 Hz                              |

| Protection Type             | Overcurrent, Short Circuit, Earth Leakage |

| Terminal Type               | Screw Terminals                       |

| Mounting Type               | DIN Rail (35mm)                       |

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

| Degree of Protection        | IP20                                  |

| Compliance                  | IEC/EN 61009-1, IEC/EN 61009-2-1, IEC/EN 60898-1 |

Core Features & Market Positioning

The Siemens 5SV3326-4 RCBO distinguishes itself through its high breaking capacity of 6kA, providing superior protection against severe short-circuit events commonly encountered in industrial settings with high power demands. Its integrated design significantly reduces the need for separate MCB and RCD components, offering a more cost-effective and space-saving solution within electrical distribution boards. This RCBO series is recognized for its reliability and longevity, a hallmark of Siemens' commitment to quality in industrial electrical components. Positioned as a premium, dependable protective device, it appeals to engineers and facility managers prioritizing safety, compliance, and reduced maintenance in their power distribution systems. The availability of different tripping characteristics (B, C, D) allows for precise application tailoring, further enhancing its market appeal for diverse equipment types.

Key Application Scenarios

This Siemens 5SV3326-4 RCBO is ideally suited for protecting circuits supplying high-power industrial machinery, such as large motors, welding equipment, and heavy-duty pumps, where substantial current flows are typical. It is essential for distribution boards in manufacturing plants, workshops, and commercial facilities that house substantial electrical loads. The 30mA tripping sensitivity makes it a critical component for circuits requiring enhanced protection against indirect contact, safeguarding personnel operating near such equipment. Its application is also prevalent in areas with stringent safety regulations, ensuring compliance with electrical codes for preventing fire hazards and personal injury due to electrical faults. Furthermore, it serves effectively in protecting sensitive electronic equipment integrated within industrial processes from the damaging effects of earth faults.

Practical System Integration Guidance

Integrating the Siemens 5SV3326-4 RCBO into an electrical system is straightforward due to its standard DIN rail mounting and user-friendly screw terminals. For installation, ensure the main power supply is de-energized. Connect the incoming live and neutral conductors to the respective line terminals (marked 'L' and 'N') at the top of the RCBO, and the outgoing conductors for the protected circuit to the load terminals below. It is crucial to observe the correct polarity; failure to do so will impair the residual current protection function. The device is designed for single-phase or two-wire phase systems. For optimal performance and to prevent nuisance tripping, ensure the selected tripping characteristic (B, C, or D) matches the inrush current requirements of the connected equipment. Always consult the local electrical codes and Siemens' installation manual for detailed wiring diagrams and safety guidelines before commencing any work.

Operation and Risk Mitigation

The Siemens 5SV3326-4 RCBO operates by continuously monitoring the balance of current flowing through the live and neutral conductors. If an imbalance exceeding 30mA occurs—indicating current is leaking to earth, potentially through a person—the device rapidly trips, interrupting the circuit. This swift disconnection is vital for preventing severe electric shock and mitigating fire risks associated with earth faults. To ensure continued operational safety, regular testing of the residual current function is recommended. Most RCBOs feature a "Test" button; pressing this button periodically (e.g., monthly) should trigger a trip. If the device fails to trip during testing, it signifies a fault and the unit must be replaced immediately. Troubleshooting common issues, such as persistent tripping, often involves identifying the source of the earth leakage in the connected equipment or wiring, rather than a fault within the RCBO itself, assuming the unit is correctly rated and installed.

Scalability & Long-Term Value

The Siemens 5SV3326-4 RCBO, as part of the broader Siemens industrial electrical portfolio, offers significant long-term value through its compatibility with other Siemens protective devices and distribution systems. Its standard 2-pole, 63A configuration makes it a versatile component that can be readily integrated into existing or new panel builds designed for high-power circuits. While the RCBO itself is a fixed-specification device, its integration into a modular panel system allows for straightforward replacement or expansion of protection circuits as operational needs evolve. For facilities embracing digital transformation, Siemens' electrical components can be integrated into smart distribution boards that feed data into Building Management Systems (BMS) or Industrial Internet of Things (IIoT) platforms, enabling remote monitoring and predictive maintenance insights, thereby enhancing overall system efficiency and asset longevity.

Frequently Asked Questions

What is the primary function of a Siemens 5SV3326-4 RCBO?

The Siemens 5SV3326-4 RCBO provides combined protection against overcurrents and earth leakage faults. It safeguards electrical circuits and equipment from damage caused by overloads and short circuits. Simultaneously, its sensitive residual current detection protects individuals from potentially fatal electric shocks.

How does the 30mA tripping current protect against electric shock?

A 30mA residual current is considered the threshold below which most people can disconnect their muscles from the source of current. The RCBO trips very rapidly once this leakage is detected. This fast response significantly reduces the duration of current flow through the body, minimizing injury.

What are the advantages of using a Siemens 5SV3326-4 RCBO for high-power equipment?

This RCBO offers a 6kA breaking capacity, suitable for high-fault current industrial environments. Its integrated design saves panel space by combining MCB and RCD functions. It ensures reliable protection for demanding machinery like motors and welders.

Can the Siemens 5SV3326-4 be used in residential applications?

While it offers excellent protection, the 63A rating and typical industrial design make it more suited for high-power industrial or commercial circuits. For standard residential circuits, lower-rated RCBOs or separate RCD and MCB combinations are more common.

What does the '2P' in Siemens 5SV3326-4 mean?

'2P' signifies that the RCBO has two poles, meaning it breaks both the live and neutral conductors simultaneously. This is crucial for ensuring complete disconnection and effective operation of residual current protection.

How do I install the Siemens 5SV3326-4 RCBO?

Ensure power is off. Mount the RCBO onto a standard 35mm DIN rail. Connect incoming live and neutral wires to the top terminals, and outgoing wires to the bottom terminals. Observe correct polarity for proper function.

What is the recommended testing frequency for this RCBO?

It is recommended to test the residual current function of the RCBO monthly using the integrated test button. This ensures the device remains operational and ready to trip when needed.

What could cause the Siemens 5SV3326-4 to trip frequently?

Frequent tripping can indicate an overload condition, a short circuit, or an earth leakage fault in the protected circuit or connected equipment. Investigate the load and wiring for issues before assuming an RCBO fault.

What are the typical environments where this RCBO is used?

This RCBO is designed for industrial settings, such as manufacturing plants, workshops, and heavy commercial facilities. It is ideal for protecting circuits powering machinery and high-demand electrical equipment.

Does this RCBO offer adjustable settings for tripping current or delay?

The Siemens 5SV3326-4 typically features fixed tripping parameters (63A, 30mA) and tripping characteristics (e.g., B, C, D) selected at the time of purchase. It does not usually offer adjustable settings for these core protective functions.