3RH1921-1FA31

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The Siemens 3RH1921-1FA31 is an industrial-grade auxiliary contact block designed for seamless integration with Sirius series contactors. Featuring a 4-pole design with 3 normally open (NO) and 1 normally closed (NC) contacts, this front-mount accessory offers reliable signaling and control capabilities. Its quick snap-on installation mechanism fits Siemens 3RT1 Size S0, S2, or S3 three-pole contactors, enabling tool-less mounting and removal, minimizing downtime during maintenance. Engineered to meet IEC 60947-5-1 and VDE standards, the 3RH1921-1FA31 provides durable operation with high contact reliability suitable for heavy-duty industrial automation environments. Its IP20 protection class ensures safety for the front side while operating reliably within temperature ranges of -25 °C to +60 °C. This auxiliary block enhances contactor versatility with screw terminal connections for secure wiring and is ideal for expanding the switching capabilities of your control system.

Key Features of Siemens 3RH1921-1FA31

  • 4-pole contact block with 3 NO and 1 NC auxiliary contacts for versatile control logic
  • Snap-on front mounting compatible with Siemens Sirius 3RT1 contactors (Size S0-S3)
  • Screw terminal connections provide secure and easy wiring
  • High contact reliability with up to 100 million switching operations at low currents
  • Compliance with IEC 60947-5-1 and EN 60 947 standards
  • Protection class IP20 on the front side for operator safety
  • Operating temperature range from -25 °C to +60 °C, consistent with industrial conditions
  • Expandable auxiliary switching poles when combined with side-mounted contacts
  • Designed for use in contactor relays and power contactors in demanding industrial applications

Technical Specs of 3RH1921-1FA31

Refer to Siemens 3RH1921-1FA31 specifications covering voltage, contact configuration, and operational limits to ensure system compatibility.

Specification Value
Contact Configuration 3 NO + 1 NC
Rated Insulation Voltage 690 V
Contact Current (AC-15, 230V) 6 A
Mechanical Life 10,000,000 cycles
Electrical Life 200,000 cycles at AC-15 / 230V
Operating Temperature -25 °C to +60 °C
Protection Class IP20 (front)

Applications / Use Case

This Siemens 3RH1921-1FA31 is commonly used in machine automation and factory control panels worldwide. Its role as an auxiliary contact block enables it to expand and customize control signals from primary contactors, allowing sophisticated automation circuits. It is ideal for assembly lines, conveyor systems, and process control setups requiring reliable status feedback and interlocking functions. The compact modular design facilitates easy upgrades or replacements in existing control systems, enhancing operational flexibility in production environments.

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3RH1921-1FA31

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Does it come with a warranty?

Yes, All products are offered wth 1-Year warranty.

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