Siemens 5SV3342-4 Miniature Circuit Breaker 4P 25A 30mA
The Siemens 5SV3342-4 Miniature Circuit Breaker (MCB) is a robust 4-pole, 25A, 30mA residual current device designed for comprehensive protection in demanding industrial and commercial electrical installations. This MCB excels in safeguarding personnel against indirect contact with live parts and preventing fires caused by persistent earth faults. Its core advantages lie in its high breaking capacity, reliable tripping characteristics, and compliance with stringent international safety standards. Key technical parameters include a rated current of 25A, a rated residual operating current of 30mA, and a 4-pole configuration suitable for multi-phase systems.
Product Specifications
| Feature | Specification |
| :-------------------------- | :------------------------------------------ |
| Product Type | Miniature Circuit Breaker (MCB) |
| Series | 5SV3 |
| Poles | 4 |
| Rated Current (In) | 25A |
| Rated Residual Operating Current (IΔn) | 30mA |
| Rated Voltage (Ue) | 400V AC |
| Rated Breaking Capacity (Icn) | 6kA |
| Tripping Characteristic | Type AC |
| Frequency | 50/60 Hz |
| Mounting Type | DIN Rail |
| Protection Class | IP20 (terminal area), IP40 (enclosure) |
| Operating Temperature | -25°C to +45°C |
| Compliance Standards | IEC/EN 61009-1, IEC/EN 60947-2 |
Core Features & Market Positioning
The Siemens 5SV3342-4 distinguishes itself through its superior performance and reliability, positioning it as a premium choice for critical electrical protection. Its Type AC tripping characteristic ensures effective detection of sinusoidal AC residual currents, a common fault type in industrial settings. The high breaking capacity of 6kA provides robust protection against short circuits, preventing severe damage to electrical equipment and minimizing downtime. Siemens' reputation for manufacturing excellence guarantees a durable and long-lasting solution, reducing the total cost of ownership through fewer replacements and maintenance interventions. The 4-pole design offers complete isolation and protection for all phases and the neutral conductor, crucial for balanced three-phase systems where unexpected ground faults can occur.
Key Application Scenarios
This MCB is ideally suited for a wide array of applications, particularly where enhanced safety and reliable fault detection are paramount. In industrial environments, it serves as an essential component in control panels for machinery, power distribution boards, and manufacturing lines, protecting both personnel and sensitive equipment from electrical hazards. For commercial buildings, the Siemens 5SV3342-4 is a vital safeguard in main distribution boards and sub-panels for areas with higher risk, such as laboratories, workshops, and facilities housing sensitive electronic equipment. It is also a critical protective device for HVAC systems, pumps, and motors, ensuring uninterrupted operation while mitigating risks associated with earth leakage. Its 30mA sensitivity makes it ideal for protecting circuits supplying portable equipment used in potentially damp environments, fulfilling requirements for enhanced shock protection.
Practical System Integration Guidance
Integrating the Siemens 5SV3342-4 into existing electrical systems is straightforward due to its standard DIN rail mounting and familiar terminal configurations. For installation, ensure the main power supply is de-energized. Connect the incoming phase and neutral conductors to the designated line-side terminals, observing correct polarity. The outgoing load conductors should then be connected to the load-side terminals. Proper torque must be applied to the terminals to ensure secure connections and prevent overheating. Given its 4-pole design, it is imperative to connect all four terminals for proper system protection, especially in three-phase installations. Ensure the breaker is correctly seated on the DIN rail and secured with the provided retaining clip. Pre-commissioning checks should include verifying correct wiring and performing insulation resistance tests.
Operation and Risk Mitigation
The Siemens 5SV3342-4 operates by continuously monitoring the balance of current flowing in the phase conductors versus the neutral conductor. If an imbalance (indicating a leakage current to earth exceeding 30mA) is detected, the internal mechanism rapidly trips, interrupting the circuit and isolating the fault. This swift action is crucial for preventing electric shock injuries from indirect contact, where a fault may energize normally non-live parts. To mitigate risks, ensure the MCB is rated appropriately for the circuit's load and fault current levels. Regular visual inspections for any signs of damage or overheating are recommended. Periodic testing of the residual current function, typically via the integrated test button, is vital to confirm its operational readiness. Avoid overloading circuits beyond the 25A rating, as this can lead to nuisance tripping or premature device failure.
Scalability & Long-Term Value
The Siemens 5SV3342-4 offers excellent long-term value and compatibility within the broader Siemens industrial automation ecosystem. Its adherence to international standards ensures interoperability with a wide range of protection and control devices. While MCBs themselves are generally not "upgraded" in the traditional sense, their selection and deployment can be part of a scalable protection strategy. For systems requiring advanced monitoring or remote control capabilities, consider integrating the 5SV3342-4 within smart electrical panels that incorporate communication modules. This allows for data logging of fault events and status monitoring, contributing to predictive maintenance and the overall digitalization of industrial operations. Its robust construction and Siemens' commitment to quality assure a long service life, minimizing the need for premature replacement and supporting sustainable operational practices.
Frequently Asked Questions
What is the primary function of a 30mA residual current device?
A 30mA residual current device (RCD) is primarily designed to protect individuals from electric shock. It detects small leakage currents to earth, typically caused by a person coming into contact with a live conductor.
This device rapidly disconnects the power supply when such a fault current is sensed. It is crucial for preventing serious injury or fatality due to electric shock.
Its sensitivity ensures it operates well below the threshold that can cause dangerous physiological effects in humans.
How does the 4-pole configuration of the Siemens 5SV3342-4 benefit three-phase systems?
The 4-pole design ensures that all three live conductors and the neutral conductor are simultaneously disconnected during a fault. This provides comprehensive isolation for three-phase circuits.
In three-phase systems, a fault on any single phase can potentially affect the entire system's balance. A 4-pole RCD guarantees complete disconnection, preventing further damage or hazards.
This configuration is essential for balanced three-phase loads and systems where neutral conductor integrity is critical for operational safety and stability.
What are the typical installation requirements for the Siemens 5SV3342-4 MCB?
Installation requires mounting the MCB securely onto a standard 35mm DIN rail within an appropriate enclosure. Ensure the power supply to the circuit being protected is completely de-energized before commencing work.
Connect the incoming live and neutral conductors to the line-side terminals and the outgoing conductors to the load-side terminals, observing correct polarity. Use appropriately sized conductors and ensure all terminal connections are tightened to the manufacturer's specified torque.
Verify that the ambient temperature is within the operational range of -25°C to +45°C and that the terminal area protection class (IP20) is maintained. Always follow local electrical codes and regulations during installation.
