Siemens 3RH1921-2CA01 SIRIUS Front-Side Auxiliary Switch, 1 NC Contact, Spring-Type Terminal for 3RT1 Contactors Original Brand New

Overview: Siemens 3RH1921-2CA01 SIRIUS Auxiliary Switch

The Siemens 3RH1921-2CA01 is a high-quality, front-side auxiliary switch designed to expand the auxiliary contact capacity of Siemens SIRIUS 3RT1 power contactors (sizes S0 to S12). It is an essential component for control circuit applications, offering reliable signaling and interlocking functions.

This specific model features one Normally Closed (1 NC) instantaneous contact and utilizes a user-friendly spring-type terminal connection method, ensuring quick, secure, and vibration-proof wiring without the need for specialized tools. Its snap-on, front-mounting design allows for tool-free installation directly onto the compatible 3RT1 contactors, streamlining assembly and maintenance.

Benefit

1. Quick Installation: The front-side snap-on mounting design allows for fast, tool-free assembly, significantly reducing wiring time and effort.
2. Reliable Connection: Spring-type terminals provide permanent, vibration-resistant, and maintenance-free connections, ensuring high operational reliability.
3. Space Efficiency: Front mounting saves panel width compared to side-mounted solutions, optimizing control cabinet space.
4. Enhanced Safety: Meets safety standards, often functioning as a mirror contact (in conjunction with 3RT1), which is crucial for safety-related circuits (e.g., monitoring contactor position).
5. Seamless Integration: Part of the comprehensive Siemens SIRIUS modular system, ensuring perfect compatibility and consistent performance with 3RT1 contactors.

Function

The 3RH1921-2CA01 auxiliary switch adds an extra Normally Closed (NC) signaling circuit to the main contactor (3RT1). This NC contact opens when the main contactor coil is energized (contactor pulls in) and is typically used for:

• Signaling: Providing feedback on the operational status of the main contactor to PLCs or other control systems.
• Interlocking: Creating safety interlocks within a control circuit, ensuring one action cannot occur until another is confirmed (e.g., confirming a contactor is de-energized before starting a sequence).
• Mirror Contact Functionality: In safety applications, the NC contact verifies that the main power contacts have opened correctly when the contactor is de-energized.

Application

• Control Systems for Industrial Machinery
• HVAC and Pumping Systems
• Motor Control Circuits
• Safety and Monitoring Circuits in Automation
• Any application requiring additional signaling or interlocking contacts for Siemens 3RT1 contactors.

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