The Siemens Auxiliary Contact Block 3RH1921-1EA20 is a premium industrial accessory designed to enhance the functionality of Siemens SIRIUS contactors in frame sizes S6 to S12. Engineered for industrial automation, motor control, and electrical switching applications, this 2-pole first laterally mountable auxiliary contact block provides additional auxiliary contacts that support signaling, monitoring, interlocking, and control circuit functions.
Available at SB Smart (sbsmart.in), the 3RH1921-1EA20 Auxiliary Contact Block offers seamless integration with Siemens SIRIUS power contactors, enabling engineers and panel builders to expand control capabilities without increasing panel space requirements. Its compact side-mounted design ensures easy installation while maintaining the reliability and performance expected from Siemens industrial products.
The Siemens 3RH1921-1EA20 is particularly valuable in applications where additional normally open contacts are required for PLC feedback, status indication, control logic, and automation systems. Built to Siemens quality standards, this auxiliary contact block delivers long-term durability and dependable performance even in demanding industrial environments.
Modern industrial automation systems often require additional contact points to support complex control functions and equipment monitoring. The 3RH1921-1EA20 enables users to expand the auxiliary contact capacity of Siemens contactors while maintaining a compact and efficient control panel layout.
Its first lateral mounting position allows easy attachment directly to compatible S6–S12 contactors, making installation simple and efficient. The 2NO (Normally Open) contact arrangement is ideal for signaling, status feedback, PLC inputs, and automation control circuits.
By incorporating the Siemens 3RH1921-1EA20 Auxiliary Contact Block, industries can improve system flexibility, enhance monitoring capabilities, and support advanced automation requirements.
The Siemens 3RH1921-1EA20 provides additional contact points that can be used for:
The 2NO contact configuration makes this module especially useful for applications requiring additional normally open signaling and control functions.
The Siemens 3RH1921-1EA20 Auxiliary Contact Block is widely used in:
Its reliable performance and seamless compatibility with Siemens contactors make it an essential accessory for modern industrial control systems.
At SB Smart (sbsmart.in), we provide genuine Siemens industrial automation and electrical products sourced through trusted supply channels. The 3RH1921-1EA20 Auxiliary Contact Block offers a dependable and cost-effective solution for expanding contactor functionality while maintaining Siemens-quality reliability.
Whether you are building a new control panel, upgrading existing automation equipment, or adding monitoring and signaling functions to a motor starter system, the Siemens 3RH1921-1EA20 delivers the performance and durability required for industrial applications.
| Specification | Details |
|---|---|
| Product Name | Auxiliary Contact Block |
| Manufacturer | Siemens |
| Series | SIRIUS |
| Order Code | 3RH1921-1EA20 |
| Product Type | Auxiliary Contact Block |
| Contact Configuration | 2 NO |
| Number of Poles | 2 Pole |
| Mounting Position | First Laterally Mountable |
| Compatible Contactor Sizes | S6 to S12 |
| Terminal Type | Screw Terminals |
| Mounting Method | Side Mount |
| Electrical Function | Signaling & Monitoring |
| Suitable For | Siemens SIRIUS Contactors |
| Industrial Application | Yes |
| Mechanical Life | Long Service Life |
| Electrical Durability | Industrial Grade |
| Brand | Siemens |
| Condition | New & Genuine Product |
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