Siemens 5SV3646-8 Miniature Circuit Breaker 4P 63A 300mA
The Siemens 5SV3646-8 Miniature Circuit Breaker 4P 63A 300mA is a robust and reliable solution designed for comprehensive overcurrent and short-circuit protection in a wide range of electrical installations. This four-pole breaker, with a rated current of 63A and a residual current sensitivity of 300mA, offers essential safety and operational continuity for commercial, industrial, and residential applications. Its advanced tripping characteristics and high breaking capacity ensure efficient fault disconnection, safeguarding both personnel and equipment from electrical hazards. The 5SV3646-8 is engineered for demanding environments, providing dependable performance and peace of mind.
Product Specifications
| Feature | Specification |
| :------------------------ | :------------------------------------------------ |
| Product Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 4-Pole (4P) |
| Rated Current (I n ) | 63 A |
| Residual Current Rating | 300 mA |
| Breking Capacity (I c ) | 10 a
| Voltage Rating (U e ) | 400 V AC |
| Tripping Curve | C-Characteristic |
| Frequency | 50/60 Hz |
| Terminal Type | Screw Terminals |
| Mounting Type | DIN Rail (35 mm) |
| Protection Class | IP20 (Enclosure), IP40 (with cover) |
| Ambient Temperature Range | -25°C to +45°C |
| Standards Compliance | IEC/EN 61009-1, IEC/EN 61009-2-1 |
Core Features & Market Positioning
The Siemens 5SV3646-8 distinguishes itself through its precise tripping mechanisms and a robust construction that ensures longevity even under continuous operational stress. As a C-characteristic breaker, it provides a balance between surge protection and sensitivity to moderate overcurrents, making it ideal for circuits with inductive loads like motors and transformers. Its 300mA residual current sensitivity is optimized for primary equipment protection, offering a crucial layer of safety against earth faults. Siemens' established reputation for quality and reliability in the electrical protection sector positions this MCB as a preferred choice for professionals demanding dependable performance and adherence to stringent safety standards. The 10 kA breaking capacity further underscores its capability to handle significant fault currents, a critical factor in industrial environments.
Key Application Scenarios
This 4-pole, 63A, 300mA miniature circuit breaker finds extensive use across various sectors requiring reliable electrical protection. In industrial settings, it is frequently deployed for safeguarding motor control circuits, transformer feeders, and distribution boards where inductive loads are common. Commercial buildings utilize the Siemens 5SV3646-8 for main incoming protection and for circuits powering HVAC systems or large lighting arrays, ensuring safety and compliance. For residential applications, it serves as an effective main breaker or for protecting high-demand circuits like those for electric water heaters and cooking appliances. Its residual current detection capability is particularly valuable in areas where increased risk of electric shock exists, such as damp environments or areas with older wiring infrastructure.
Practical System Integration Guidance
Integrating the Siemens 5SV3646-8 into existing electrical systems is straightforward due to its standard DIN rail mounting and screw terminal connections. Installers must ensure the breaker is mounted vertically or horizontally on a 35mm DIN rail within an appropriate enclosure, maintaining sufficient clearance for ventilation. Proper wiring is critical: the four poles should be connected to the incoming power supply (L1, L2, L3, N) and the outgoing protected circuits accordingly. For residual current protection, the neutral conductor must be connected through the breaker. It's imperative to verify that the upstream and downstream conductor sizes are compatible with the 63A rating and that all connections are tightened to the manufacturer's specified torque to prevent overheating and ensure reliable operation.
Operation and Risk Mitigation
The Siemens 5SV3646-8 operates by monitoring both overcurrents and earth leakage currents. Overcurrents exceeding its calibrated threshold, either gradual overloads or rapid short circuits, will cause the breaker to trip, interrupting the circuit. Simultaneously, the 300mA residual current detection will trip the breaker if an imbalance between the live and neutral conductors suggests current is leaking to earth, significantly reducing the risk of electric shock and fire. In the event of a trip, identifying the cause is paramount. Common issues include circuit overload due to excessive connected devices, short circuits from faulty wiring or equipment, or persistent earth leakage. After rectifying the fault, the breaker can be reset by moving the toggle switch to the "ON" position. Regular visual inspection for signs of damage or overheating is recommended.
Scalability & Long-Term Value
The Siemens 5SV3646-8 Miniature Circuit Breaker offers excellent long-term value through its robust design and compatibility with the broader Siemens SENTRON system. This compatibility allows for seamless integration into larger electrical distribution systems, facilitating future upgrades or expansions. As electrical demands evolve, systems incorporating these breakers can readily accommodate additional circuits or higher-capacity components by ensuring the overall system design remains within the aggregate protection limits. While the 5SV3646-8 itself is a fixed-specification device, its reliable performance and adherence to international standards ensure it remains a dependable component for years, minimizing the need for premature replacement and contributing to the overall stability and efficiency of the electrical infrastructure.
Frequently Asked Questions (FAQs)
What is the primary function of a Siemens 5SV3646-8 MCB?
This breaker provides overcurrent and short-circuit protection for electrical circuits. It safeguards equipment from damage due to excessive current and prevents electrical fires.
How does the 300mA residual current rating contribute to safety?
The 300mA sensitivity detects dangerous earth leakage currents. This significantly reduces the risk of electric shock to individuals interacting with faulty equipment.
What type of loads is the C-characteristic suitable for?
C-curve breakers are designed for circuits with moderate inrush currents. They are ideal for inductive loads like motors, transformers, and fluorescent lighting.
Can this breaker be used for DC circuits?
No, the Siemens 5SV3646-8 is designed for AC circuits only. Using it on DC circuits can lead to incorrect tripping or failure to trip.
What is the breaking capacity of the 5SV3646-8?
The breaker has a breaking capacity of 10 kA. This means it can safely interrupt fault currents up to 10,000 amperes without sustaining damage.
How do I reset a tripped Siemens 5SV3646-8?
Locate the tripped breaker's toggle switch. First, push it fully to the "OFF" position, then flip it back to the "ON" position to reset.
What are the environmental operating conditions for this MCB?
It operates reliably in ambient temperatures between -25°C and +45°C. Ensure adequate ventilation to prevent overheating during operation.
Is the Siemens 5SV3646-8 compatible with other Siemens protection devices?
Yes, it is part of the Siemens SENTRON series. This ensures compatibility with other components within the Siemens protection and distribution system.
What is the physical installation method for this circuit breaker?
The 5SV3646-8 is designed for standard 35mm DIN rail mounting. It features easy-to-use screw terminals for secure electrical connections.
Where is the optimal application for a 4-pole, 63A, 300mA breaker?
It's suitable for main distribution boards and circuits with significant loads in industrial, commercial, and some residential settings. The 4-pole design ensures complete isolation of all conductors.
