# Siemens 3RH1921-1DA11 Auxiliary Switch Block, 1NO + 1NC, Side-Mounted

**URL:** https://aio.lv/en/product--siemens-3rh19211da11--1840470
**Data updated:** 2026-05-18 02:51 (EEST)
**Category:** Printer & Copier Parts
**Manufacturer:** Siemens
**Manufacturer code:** 3RH19211DA11
**EAN:** 4011209379862
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

The Siemens 3RH1921-1DA11 auxiliary switch block is designed for side mounting on contactors. It features 1 normally open (NO) and 1 normally closed (NC) contact, compliant with DIN EN 50012 standards. This reliable switching component is essential for industrial control systems, providing additional signaling and interlocking capabilities for electrical automation applications.

## Long description

The Siemens 3RH1921-1DA11 auxiliary switch block is a high-quality switching component engineered for seamless integration with industrial contactors. Designed for side-mounting, this unit expands the functionality of your control system by providing one normally open (NO) and one normally closed (NC) contact. It is manufactured to meet rigorous DIN EN 50012 standards, ensuring consistent performance and safety in demanding electrical automation environments.
Advantages
This auxiliary switch block offers exceptional reliability and ease of installation for complex control circuits. By mounting directly to the side of the contactor, it saves valuable space within control cabinets while providing essential feedback and interlocking signals. The robust construction ensures long-term durability, making it an ideal choice for maintaining stable operations in industrial settings where precise switching is required.
Suitable for
Industrial automation control systems
Electrical interlocking circuits
Signaling and status monitoring applications
Motor control centers
This component may not be suitable for applications requiring high-current switching, as it is designed specifically for control-level signals. It is also not compatible with contactors that do not support side-mounted auxiliary blocks or those outside the specified series compatibility range.
Key specifications
Contact configuration: 1 NO (Normally Open) and 1 NC (Normally Closed)
Mounting type: Side-mounted
Standard compliance: DIN EN 50012
Application: Industrial control and signaling
To install the auxiliary switch block, ensure the main contactor is disconnected from the power supply. Align the switch block with the designated side-mounting interface on the contactor and snap it into place until it is securely locked. Verify that the mechanical linkage is correctly engaged before restoring power to the system.
What to consider before purchase
Verify compatibility with your specific contactor model series
Ensure sufficient space is available on the side of the contactor within the control panel
Confirm that the contact configuration meets your circuit requirements
Always perform a functional test of the auxiliary contacts after installation to ensure they trigger correctly in response to the main contactor state. Ensure all wiring connections are tightened to the manufacturer's specified torque to prevent loose contacts.

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### What is the warranty period?

All Siemens products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Siemens service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

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