Siemens 3RH2911-1MA11 Auxiliary Switch, Front Mount for 3RT2 & 3RH2 Contactors Original Brand New

Overview

The Siemens SIRIUS 3RH2911-1MA11 is a high-quality, front-mounted auxiliary switch block designed for seamless integration with the SIRIUS 3RT2 Power Contactors and SIRIUS 3RH2 Contactor Relays. This essential component is used to expand the number of auxiliary contacts in control circuits, enabling greater flexibility and control. It features a simple snap-on mounting mechanism for quick, tool-free installation.

Key Features and Specification

• Contact Configuration: 1 Normally Open (NO) + 1 Normally Closed (NC) instantaneous contacts.
• Mounting: Front-mounted (Snap-on for easy installation).
• Connection Type: Screw Terminals (highly reliable for industrial wiring).
• Cable Entry: Cable entry from below.
• Terminal Designation: Clearly marked terminals 73/74 (NO) and 81/82 (NC).
• Compatibility: Specifically designed for use with Siemens 3RT2 Contactors (Sizes S00, S0, S2) and 3RH2 Contactor Relays.
• Brand/Series: Siemens SIRIUS modular system.
• IP Protection: IP20 on the front.
• Contact Reliability: High contact reliability (1 faulty switching per 100 million at 17V, 1mA).
• Technical Compliance: Compliant with IEC 60947-5-1 standards.
• Functionality: Acts as a mirror contact (with 3RT2) or for positively driven operation (with 3RH2), ensuring safety and precise control.

Benefit

• Enhanced Control: Easily expand your control circuit with an additional NO and NC contact, allowing for complex interlocking and signaling functions.
• Quick Installation: The snap-on front-mounting design eliminates the need for tools, drastically reducing installation time and effort.
• High Reliability: Part of the trusted Siemens SIRIUS modular system, offering robust performance and a long mechanical service life of up to 10 million operating cycles.
• Simplified Wiring: Screw terminals and cable entry from below provide a secure and straightforward wiring solution.
• Wide Compatibility: Standardized compatibility with various sizes of 3RT2 and 3RH2 units ensures versatility across different applications.

Function

1. Status Indication: The NO and NC contacts can be used to signal the ON/OFF status of the main contactor to control devices (PLCs, indicator lights, etc.).
2. Interlocking Circuits: Used to create electrical interlocking schemes, preventing simultaneous operation of conflicting equipment for safety (e.g., in reversing contactor assemblies).
3. Control Circuit Expansion: Provides supplementary contacts for auxiliary functions within motor control, automation, and industrial switching systems.

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