Siemens SIRIUS 3RH2911-2XF12-0KS1 Auxiliary Switch Block, Front-Mount, 1 NO + 2 NC, Spring-Loaded Terminal for 3RT2/3RH2 Original Brand New

Overview

The Siemens SIRIUS 3RH2911-2XF12-0KS1 is a high-performance, front-mounted auxiliary switch block designed for seamless integration with SIRIUS 3RT2 power contactors and 3RH2 contactor relays. This essential control component provides reliable switching signals for complex automation tasks, featuring a configuration of 1 Normally Open (NO) and 2 Normally Closed (NC) contacts. A key feature is the inclusion of solid-state compatible NC contacts, making it ideal for interfacing with modern electronic control systems like PLCs (Programmable Logic Controllers). The use of spring-loaded terminals ensures fast, secure, and vibration-proof wiring connections.

Key Specifications & Features

• Brand: Siemens SIRIUS
• Product Type: Auxiliary Switch Block (Front-Mount)
• MLFB (Product Number): 3RH2911-2XF12-0KS1
• Contact Configuration: 1 NO (Normally Open) + 2 NC (Normally Closed)
• Solid-State Compatible: Yes (NC contacts are solid-state compatible)
• Terminal Design: Spring-Loaded Terminal (Fast, reliable wiring)
• Mounting: Front-side snap-on mounting for compatible contactors/contactor relays.
• Compatibility: Designed for use with SIRIUS 3RT2 Contactors and SIRIUS 3RH2 Contactor Relays.
• Terminal Designation (Main Path): 51/52, –/–, 63/64, 71/72
• Current Path Details: 1 NC (solid-state compatible), –, 1 NO, 1 NC (solid-state compatible)
• Insulation Voltage (Rated): Up to 690 V AC
• Protection Class: IP20 (on the front)
• Typical Mechanical Service Life: 10,000,000 operating cycles

Benefit

• Enhanced Reliability: Solid-state compatible NC contacts ensure dependable low-current switching for PLC inputs and electronic circuits.
• Fast Installation: Front-mount, snap-on design allows for tool-free, quick assembly and disassembly on the main contactor unit.
• Time-Saving Wiring: Spring-loaded terminals drastically reduce wiring time and ensure a highly secure, vibration-resistant connection compared to traditional screw terminals.
• Industrial Standard: Part of the globally recognized Siemens SIRIUS modular system, guaranteeing quality, compatibility, and long-term availability.
• Versatile Control: The 1 NO and 2 NC configuration offers versatile signaling options for motor control and interlocking applications.

Function

The 3RH2911-2XF12-0KS1 extends the contact capacity of a base contactor or contactor relay. When the main contactor is energized, this auxiliary switch block instantly changes the state of its contacts (NO closes, NC opens), providing essential feedback and control signals to the higher-level automation system (e.g., PLC, safety relay, indicator lights) to confirm the main device’s operational status. The solid-state compatible feature is crucial for maintaining signal integrity with sensitive electronic inputs.

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