Siemens 3RH2911-2HA31 Auxiliary Switch, Front Mount for 3RT2 Contactors & 3RH2 Relays Original Brand New

Overview

The Siemens SIRIUS 3RH2911-2HA31 is a high-performance, front-mounted auxiliary switch designed to effortlessly expand the contact capabilities of SIRIUS 3RT2 power contactors and 3RH2 contactor relays. Engineered for reliability in industrial control circuits, this unit features a contact configuration of 3 Normally Open (NO) and 1 Normally Closed (NC) instantaneous contacts, offering precise switching for monitoring and signaling functions. The robust spring-loaded terminals (also known as spring-type or cage clamp terminals) ensure fast, vibration-proof, and maintenance-free wiring.

Benefits & Features

1. Quick Expansion: Easily snaps onto the front of compatible 3RT2 contactors and 3RH2 contactor relays, requiring no tools for installation.
2. Reliable Connection: Features spring-loaded terminals for secure, long-lasting, and highly vibration-resistant wiring, reducing installation time and maintenance needs.
3. Versatile Control: Provides four auxiliary contacts for flexible implementation in complex control, signaling, and interlocking circuits.
4. Instantaneous Switching: All contacts are instantaneous, ensuring immediate and simultaneous switching action with the main device.
5. High Durability: Typical mechanical service life of 10 million operating cycles, ensuring long-term performance and reliability in demanding industrial environments.

Function

The 3RH2911-2HA31 Auxiliary Switch serves to multiply the available auxiliary contacts on a contactor or contactor relay.⁹ This is essential for:

• Signaling: Indicating the ON/OFF status of the main power contactor to PLCs or indicator lights.
• Interlocking: Creating electrical interlocks in motor control circuits (e.g., preventing forward and reverse contactors from being active simultaneously).
• Control Circuit Logic: Providing additional contacts needed for complex control sequences and safety circuits.

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