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5SY4 Miniature Circuit Breaker

The Siemens SENTRON 5SY4 is a compact miniature circuit breaker (MCB) suitable for AC 50/60Hz, 230/400V systems. It has a rated current of 0.3-63A, a breaking capacity of 5-15kA (IEC 60898), and is available in 1P/1+N/2P/3P/3+N/4P configurations. It features thermal-magnetic tripping (B/C/D curves), modular DIN rail mounting, high protection, and tool-free installation. It is suitable for terminal circuits, lighting, sockets, control circuits, and small motor protection in industrial, commercial, and residential buildings, balancing personal safety and system stability.

PRODUCT DETAIL

Features:

 

Safe and Reliable: Fully enclosed terminals protect against electric shock; rear window indicates contact status; handle lock prevents accidental operation; 15kA breaking capacity, efficient current limiting, reducing the impact of faults.

 

Easy Installation and Maintenance: Tool-free sliding snap installation; universal DIN rail compatibility; same accessories compatible with the entire series, reducing spare parts costs; clear opening and closing indicators for easy status monitoring.

 

Strong Application Adaptability: B/C/D curves cover lighting, sockets, control circuits, and small motors; 1+N/3+N pole configurations adapt to neutral protection, meeting the needs of different grounding systems.

 

Environmentally Friendly and Compliant: Halogen-free and silicon-free design, suitable for sensitive environments; compliant with EN 60204-1, can be used as a main switch for equipment.

 

Typical Applications:

 

Industrial Applications: Control circuits, small motors, PLC and inverter power supply, instrument and sensor branches; D curve adapts to motor starting impact.

 

Commercial and Public Buildings: Building lighting, socket circuits, air conditioning indoor units, fan coil units, UPS outputs in low-voltage rooms, 1+N/3+N compatible with neutral line protection.

 

Residential Buildings: Residential indoor distribution box branch circuits, smart home control circuits, DC side of photovoltaic inverters (≤72V DC), B/C curve compatible with lighting and mixed loads.

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