Siemens HJX3V400L 400A 3-Pole 3 V Circuit Breaker Potential Transformer

The Siemens HJX3V400L is a purpose-built solution for demanding three-phase protection, delivering reliable disconnects and precise monitoring in one integrated unit. With a 400 A current rating, a 3-pole design, and an integrated potential transformer, this breaker simplifies protection schemes while reducing wiring complexity in industrial panels and switchgear. Part Number HJX3V400L reflects Siemens’ commitment to durable, trustworthy protection when it matters most.

Key advantages that matter in real-world setups

• 400 A current rating provides robust protection for heavy-load applications, helping to prevent equipment damage and unplanned downtime.
• 3-pole design ensures simultaneous disconnection of all three phases, which is essential for safe tripping in balanced and unbalanced three-phase systems.
• Integrated potential transformer supports metering, protective relays, and control signaling without the need for separate accessories, simplifying installation and maintenance.
• Compact, Siemens-engineered construction designed to withstand industrial environments, delivering consistent performance over time.
• Part Number HJX3V400L provides a precise identification for ordering, stocking, and compatibility within Siemens protection ecosystems.
• Voltage rating: 3 V aligns with specific low-voltage protection and monitoring configurations, enabling streamlined integration with compatible systems.

Ideal use cases

• Industrial power distribution panels where three-phase protection and accurate monitoring are critical.
• Data centers or manufacturing lines with high startup currents that require dependable, rapid fault isolation.
• Protection schemes that benefit from built-in metering and signaling, reducing the need for additional instrumentation.
• New installations or retrofits in Siemens-oriented protection architectures seeking a unified breaker and transformer solution.

What this means for you

Choosing the HJX3V400L means selecting a trusted Siemens device that pairs robust overcurrent protection with a convenient, integrated measurement component. The combination minimizes wiring, accelerates installation, and supports clearer diagnostics for maintenance teams. By aligning with three-phase protection standards and Siemens’ relays and panels, this unit helps you achieve faster fault clearing, better system visibility, and streamlined spare-part management.

Technical snapshot

• Current rating: 400 A
• Poles: 3
• Voltage rating: 3 V
• Part Number: HJX3V400L
• Type: Circuit Breaker with Integrated Potential Transformer

For professionals stocking Siemens protection equipment, the HJX3V400L offers a cohesive, reliable solution that aligns with established protection strategies while delivering the convenience of an integrated measurement component. When performance, clarity, and streamlined installation are priorities, this 3-pole, 400 A unit with a built-in potential transformer stands out as a practical, purpose-driven choice.