Siemens 3RH7921-1CA10 Auxiliary Contact Block 1 NO, 1-Pole for SIRIUS S0-S3 Contactors with Screw Terminal Original Brand New

Overview

The Siemens 3RH7921-1CA10 is a high-quality, 1-pole auxiliary contact block designed to expand the functionality of your SIRIUS series motor contactors. Specifically engineered for seamless integration with contactors of sizes S0 through S3, this unit provides an additional normally open (NO) contact point. Its robust design and reliable screw terminals ensure a secure and durable electrical connection, making it an essential component for a wide range of industrial control and automation applications.

Key Benefit

• Expanded Functionality: Adds a 1 NO contact to your existing SIRIUS contactor, allowing for enhanced control, signaling, and interlocking capabilities.
• Seamless Compatibility: Perfectly fits Siemens SIRIUS contactors from size S0 to S3, ensuring easy and quick installation without the need for modifications.
• Reliable Connections: Features secure screw terminals, providing a strong and dependable electrical connection that resists vibration and wear.
• Durable and Robust: Built with high-quality materials to withstand the demanding conditions of industrial environments, ensuring long-term performance and reliability.
• Simplified Troubleshooting: The addition of a separate auxiliary contact simplifies circuit design and makes it easier to diagnose and troubleshoot control issues.

Function and Application

The primary function of the Siemens 3RH7921-1CA10 is to provide an auxiliary switching contact that operates in sync with the main contactor. When the main contactor coil is energized and the main contacts close, the auxiliary NO contact will also close. This functionality is crucial for various applications, including:

• Signaling: Providing a signal to a PLC (Programmable Logic Controller), a control relay, or an indicator lamp to show the status (e.g., “contactor on”).
• Interlocking: Creating safety interlocks in complex control circuits to prevent simultaneous operation of conflicting devices.
• Feedback Loops: Used in automation systems to provide feedback on the operational status of a motor or other connected load.
• Latching Circuits: As part of a control scheme where the contactor needs to “latch” or hold itself in the energized state.

Technical Specification

• Product Number: 3RH7921-1CA10
• Type: Auxiliary Contact Block
• Number of Poles: 1-pole
• Contact Configuration: 1 NO (Normally Open)
• Compatibility: SIRIUS Contactor Sizes S0, S1, S2, S3
• Connection Type: Screw Terminal
• Mounting: Front-side, tool-free snap-on mounting
• Series: SIRIUS
• Manufacturer: Siemens

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