Siemens SIRIUS 3RH1921-1EA20 Auxiliary Switch Block, 2 NO Contacts, Lateral Mount, Screw Terminal for 3RT1 Contactors Original Brand New

Overview: Siemens 3RH1921-1EA20 Lateral Auxiliary Switch

The Siemens SIRIUS 3RH1921-1EA20 is a high-quality, two-pole auxiliary switch block designed for seamless integration with Siemens 3RT1 power contactors and 3RH1 contactor relays. As a first lateral auxiliary switch, it easily snaps onto the side of the contactor, providing two instantaneous Normally Open (2 NO) auxiliary contacts to expand the control circuit capabilities. It is equipped with robust screw terminals for secure and permanent wiring.

This component is an essential part of the SIRIUS modular system, offering reliability and flexibility for industrial control applications. It conforms to DIN EN 50005 standards and is suitable for contactors from sizes S0 up to S12.

Key Features & Function

• Product Number: 3RH1921-1EA20
• Contact Configuration: 2 NO (Normally Open) instantaneous contacts.
• Mounting Position: First lateral mounting (side snap-on).
• Connection Type: Screw terminals for quick and dependable wiring.
• Compatibility: Designed for use with SIRIUS 3RT1 contactors (including 3RT10, 3RT12, etc.) and 3RH1 contactor relays.
• Application: Expands the number of auxiliary contacts for signaling and interlocking in control circuits.
• SIRIUS System: Part of the modular, efficient, and up-to-date Siemens SIRIUS industrial controls range.
• High Reliability: Features a low contact reliability rate (e.g., 1 faulty switching per 100 million at 17V, 1mA).
• Standards: Conforms to international standards like IEC 60947-5-1 and DIN EN 50005.

Benefit

1. Seamless System Expansion: Effortlessly adds two auxiliary NO contacts to your existing 3RT1 contactor, simplifying control circuit design.
2. Tool-Free Lateral Mounting: The snap-on side mounting ensures fast and easy installation without the need for additional tools, reducing installation time and labor costs.
3. Reliable Connection: High-quality screw terminals provide a secure and vibration-resistant electrical connection.
4. Long Service Life: Engineered for a typical mechanical operating cycle life of 10 million, guaranteeing long-term operation in demanding industrial environments.
5. Genuine Siemens Quality: Manufactured by Siemens, ensuring compatibility, high performance, and adherence to strict industrial quality standards.