Siemens 3VA6340-7HL31-0AA0 0A 3-Pole 3 V Circuit Breaker Potential Transformer

Meet the Siemens 3VA6340-7HL31-0AA0, a purpose-built three-pole solution that combines protection with voltage sensing in one compact unit. With a 0 A current rating, 3 V voltage rating, and an integrated potential transformer, this device is designed for streamlined control-panel wiring and reliable protection in industrial environments.

• 3-Pole configuration provides synchronized protection across all three phases, ideal for balanced three-phase systems in switchgear and control cabinets.
• Built-in potential transformer delivers accurate sensing voltage for protection relays and meters, reducing external wiring and simplifying panel layouts.
• Voltage rating of 3 V aligns with low-voltage sensing networks, supporting precise monitoring without overloading sensing circuits.
• Current rating listed as 0 A indicates the unit is intended for protection/sensing applications rather than carrying main load current, enabling compact, purpose-driven installations.
• Authentic Siemens part—part number 3VA6340-7HL31-0AA0 ensures compatibility with Siemens switchgear and the broader Siemens spare-parts ecosystem for long-term maintenance and reliability.

This model is particularly well-suited for control panels and switchgear that require integrated protection and voltage sensing. Use cases include retrofitting legacy Siemens assemblies, building compact protection circuits for three-phase equipment, and simplifying metering and relay interfaces in low-voltage networks. By combining a circuit breaker with a dedicated sensing transformer, it reduces cable runs, minimizes connection points, and accelerates installation in industrial environments.

Why choose this integrated solution? It streamlines panel design by serving dual roles—protective interruption and voltage sensing—without sacrificing performance. The 3VA6340-7HL31-0AA0 is built for reliability in demanding applications, with Siemens engineering backing and an exact part-number match to ensure straightforward sourcing and consistent replacement parts.

Practical tips for use and installation: verify compatibility with your Siemens equipment family, consult the official datasheet for mounting and terminal details, and follow standard electrical codes when wiring the PT secondary. If you’re updating an existing panel, this integrated unit can reduce component count and simplify diagnostics by providing a centralized sensing point for protection relays and meters.