Siemens SIRIUS 3RH2911-2FA04 Front Mount Auxiliary Switch Block 4 NC Contacts, Spring-Loaded Terminals Original Brand New

Overview

The Siemens SIRIUS 3RH2911-2FA04 Auxiliary Switch Block is a high-quality, front-mountable accessory designed to expand the control and signaling capabilities of SIRIUS 3RT2 power contactors and 3RH2 contactor relays. This module provides four instantaneous Normally Closed (4 NC) contacts, ensuring reliable operational feedback and circuit control.

Engineered for quick and secure wiring, it features innovative spring-loaded terminals (also known as spring-type terminals or cage clamp terminals) for fast, vibration-proof connections, significantly reducing installation time compared to traditional screw terminals. This switch is an essential component for complex industrial control systems requiring dependable auxiliary contacts.

Key Benefit

• Fast Installation: Spring-loaded terminals allow for quick, tool-free or minimal-tool wiring, saving labor and installation costs.
• High Reliability: The spring connection ensures a permanent, gas-tight, vibration-proof connection, critical for robust industrial environments.
• Compact Design: Front-mounting design allows for direct, easy snap-on installation to the main contactor or contactor relay, maintaining a space-saving profile.
• Enhanced Control: Provides four independent Normally Closed (NC) auxiliary contacts to increase the number of control signals available from a single base unit.
• Wide Compatibility: Specifically designed for seamless integration with the SIRIUS 3RT2 contactors and 3RH2 contactor relays (Sizes S00, S0, S2)

Application

The 3RH2911-2FA04 is primarily used in industrial control and automation applications for:

• Signaling and Status Monitoring: Providing immediate feedback on the main contactor’s operational status (e.g., “contactor is off”).
• Interlocking Circuits: Implementing safety and logic interlocks in complex control schemes, such as reversing contactor assemblies.
• Pilot Duty Circuits: Switching low-power control signals for PLC inputs, indicator lamps, or secondary control relays.
• Control Panel Builds: Expanding the capacity of 3RT2 contactors and 3RH2 contactor relays without changing the main components.

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