Siemens 3RH1921-2DA11 Lateral Auxiliary Switch 1NO+1NC Spring Terminal Original Brand New

Overview: Siemens SIRIUS 3RH1921-2DA11 Auxiliary Switch 

The Siemens 3RH1921-2DA11 is a high-quality, instantaneous auxiliary switch module from the SIRIUS modular system, specifically designed for use with Siemens 3RT1 contactors (Sizes S0 to S12, and contactor relays). This essential control component is a first lateral auxiliary switch, providing reliable signaling and control circuit expansion. It features a robust 1 NO (Normally Open) and 1 NC (Normally Closed) contact configuration, meeting the EN 50012 standard. The integration of spring-type terminals ensures a fast, vibration-proof, and maintenance-free connection, streamlining installation and enhancing system reliability.

Key Benefit

• Quick Installation: Lateral snap-on mounting for tool-free, fast integration with 3RT1 contactors.
• Vibration-Proof Connection: Spring-type terminals offer superior contact reliability and are maintenance-free, saving time and costs.
• Reliable Signaling: Provides a clear 1 NO and 1 NC contact for control, signaling, and interlocking functions in industrial automation.
• High Performance: Long mechanical service life (typically 10 million operating cycles) and high contact reliability.
• Industry Standard: Approved for contacor relay and power contactor applications, and compliant with standards like IEC 60947-4-1 (Mirror Contact functionality with 3RT1 contactors).

Function & Application

The 3RH1921-2DA11 auxiliary switch block expands the number of available auxiliary contacts on a main contactor or contactor relay. It is typically used for:

1. Status Indication: Signaling the operational state (ON/OFF) of the main contactor to a PLC or control panel.
2. Interlocking Circuits: Creating safety and control logic, for instance, to ensure one contactor is de-energized before another can energize.
3. Self-Holding/Latching Circuits: Providing the holding contact for a motor starter circuit.

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