Siemens SIRIUS 3RH2911-1HA22 Front-Mount Auxiliary Switch Block, 2 NO + 2 NC, Screw Terminal, for 3RT2 Contactors and 3RH2 Contactor Relays Original Brand New

Overview

The Siemens SIRIUS 3RH2911-1HA22 is a high-quality, front-mountable auxiliary switch block designed to expand the functionality of Siemens SIRIUS 3RT2 power contactors and 3RH2 contactor relays. This essential industrial control accessory provides additional signaling and control circuits, featuring a robust $2\text{ NO}+2\text{ NC}$ contact configuration with secure screw terminals. It is engineered for simple, snap-on installation directly onto the front of compatible devices, ensuring reliable performance in demanding industrial automation environments.

Function

The primary function of the 3RH2911-1HA22 auxiliary switch is to provide auxiliary contacts for status indication and control interlocking in motor control and switching circuits. When the main contactor or contactor relay is actuated, the $2\text{ NO}$ and $2\text{ NC}$ contacts simultaneously change state, enabling remote signaling or activating secondary control functions.

Key Benefit

• Versatile Expansion: Easily adds four reliable instantaneous auxiliary contacts ($2\text{ NO}/2\text{ NC}$) to your base contactor or contactor relay.
• Easy Installation: Features a quick front-mount, snap-on design, significantly reducing installation time and complexity.
• High Reliability: Part of the trusted Siemens SIRIUS line, offering a long mechanical life (10 million cycles) and high contact reliability for consistent operation.
• Secure Connection: Screw terminals ensure a robust and durable electrical connection for control wiring.
• System Integration: Perfectly compatible with the SIRIUS 3RT2 contactor and 3RH2 contactor relay family, ensuring seamless integration into existing control panels.

Application

This auxiliary switch is ideal for use in:

1. Industrial automation and control panels.
2. Complex motor control circuits requiring feedback and interlocking.
3. Signaling control panel status (e.g., Contactor ON/OFF indication).
4. Extending the number of auxiliary contacts on 3RT2 and 3RH2 devices.

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