Siemens 5SY4204-7 4A 2-Pole 400 V Circuit Breaker Potential Transformer

Siemens 5SY4204-7 is a compact, reliable 4 A two-pole circuit breaker engineered for 400 V systems, featuring an integrated potential transformer to streamline protection and measurement workflows. This combination reduces wiring complexity and lets you feed protection relays and metering equipment directly from the breaker assembly.

• Current rating: 4 A
• Poles: 2
• Voltage rating: 400 V
• Integrated potential transformer: enables direct sensing for protection relays and metering without additional CTs
• Brand and part: Siemens, 5SY4204-7

This Siemens circuit breaker is ideal for 400 V distribution panels, switchgear, and motor control centers where precise current sensing and reliable overcurrent protection are essential. The built-in potential transformer supports accurate monitoring and facilitates seamless integration with modern protection schemes, helping you respond quickly to electrical faults and maintain system uptime.

Key benefits in real-world use:

• Streamlined protection and measurement with an integrated potential transformer, reducing the need for separate sensing components.
• Space-efficient design suitable for compact control panels and densely populated switchboards.
• Consistent performance in industrial environments where 400 V networks are standard.

Ideal scenarios include new installations and retrofits in manufacturing lines, processing plants, and facilities with 400 V distributed power. Use it where you need reliable protection for two conductors while gaining immediate access to sensing signals for energy management, fault detection, and protective relays.

When installing the Siemens 5SY4204-7, ensure compatibility with your enclosure and wiring scheme, and refer to the manufacturer’s documentation for mounting and electrical connections. This part number provides a ready-to-use solution that aligns with Siemens protection architecture while delivering practical monitoring capabilities right at the breaker.