Siemens 3TX4431-2A 2A Terminal Block, Auxiliary Switch, Normally Closed | AmpState

The Siemens 3TX4431-2A is a compact, reliable terminal block built for everyday electrical work. Designed for clean wire termination and efficient distribution inside control enclosures, this part helps keep your panel wiring organized and dependable.

What makes the 3TX4431-2A stand out is the integrated auxiliary switch that is normally closed. This built-in contact provides immediate status feedback and interlock capabilities without needing a separate relay, helping you simplify control logic, enhance safety interlocks, and reduce component count in your assemblies.

Key benefits at a glance

• 2 A rated terminal block – Ideal for small to mid-size control circuits, signaling wiring, and supplementary interlocks within enclosures.
• Auxiliary switch, normally closed – Delivers fail-safe feedback to PLCs or safety circuits in the idle state, with a clear change of state when actuated.
• Clear part-number traceability – Direct Siemens part number (3TX4431-2A) ensures quick identification and seamless compatibility with existing spares and documentation.
• Panel-builder friendly – Streamlines wiring termination and distribution in control panels, reducing assembly time and potential wiring errors.
• Maintenance-friendly inventory – A reliable, standard component you can rely on when stocking spare parts for ongoing equipment maintenance.

Ideal use cases

• Maintenance teams stocking spare parts for Siemens-based control panels and enclosures
• Panel builders who need a direct part-number match for quick sourcing and consistent performance
• Control circuits requiring integrated feedback or interlock signaling without adding extra relays
• Wiring terminations inside electrical enclosures where space is at a premium and reliability matters

Why choose this terminal block over alternatives

Rather than pairing a separate auxiliary contact with a standalone terminal block, the 3TX4431-2A combines both functions in a single, Siemens-branded solution. This reduces component count, simplifies installation, and improves traceability—key advantages in maintenance-heavy environments where uptime and consistency are paramount.

Specifications at a glance

• Manufacturer: Siemens
• Part Number: 3TX4431-2A
• Product Type: Terminal Block with Auxiliary Switch
• Amperage: 2 A
• Auxiliary Contact: Normally Closed
• Availability: Available from AmpState

Need help confirming fit or compatibility for your specific panel or enclosure? AmpState is ready to assist. Our team can verify the match for your application and ensure you have the exact Siemens 3TX4431-2A you need for reliable, consistent performance in daily electrical work.