SIEMENS 3RH1921-1DA11 auxiliary contact block

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SIEMENS 3RH1921-1DA11 Auxiliary Contact Block 

Product Description

The SIEMENS 3RH1921-1DA11 is an auxiliary contact block designed for 3RH10 and 3RT10 series contactors and relays. It provides 1 normally open (NO) and 1 normally closed (NC) contact, enabling status monitoring and control signaling in industrial automation systems. This component is part of the SIRIUS Classic series, featuring screw-type terminals and side-mounting capability, making it ideal for integration into motor control circuits and power distribution panels .

Key Features & Advantages

1. Versatile Contact Configuration

   • 1 NO + 1 NC contacts, supporting 6A (AC) / 0.3–6A (DC) for flexible control applications .

   • Wide voltage range: 24–230V AC/DC, compatible with most industrial control circuits.

2. Robust Industrial Design

   • Mechanical lifespan: 10 million switching cycles, ensuring long-term reliability .

   • Surge voltage resistance: 6 kV, protecting against transient overloads .

   • IP20 protection against dust and accidental contact .

3. Easy Installation

   • Snap-on mounting for tool-free attachment to compatible contactors (e.g., 3RH1/3RT10 series) .

   • Screw terminals support 2 x 2.5 mm² cables for secure wiring.

4. Safety & Compliance

   • Isolation voltage: 690V, meeting IEC 60947 standards .

   • RoHS-compliant and certified for CE, UL, and 3C (China) .

Technical Specifications

Applications

• Motor control: Status monitoring of contactors in conveyor systems .

• HVAC systems: Signal feedback for pump and fan controls .

• Industrial automation: Integration with SIMATIC PLCs for diagnostic signaling .

Installation & Safety Notes

• Mounting: Ensure proper alignment with the host contactor (e.g., 3RH10/3RT10).

• Wiring: Use shielded cables for noise-sensitive applications .

• Environment: Avoid condensation and temperatures beyond -25°C to +60°C .

The structure and details of the product：

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