Siemens SIRIUS 3RH1921-1CA10 Front-Side Auxiliary Switch Block, 1 NO, Screw Terminal, for 3RT1 Contactors Original Brand New

Overview

The Siemens 3RH1921-1CA10 is a high-quality, single-pole, Normally Open (NO) front-side auxiliary switch block designed for seamless integration with Siemens SIRIUS 3RT1 power contactors. Featuring reliable screw terminals, this compact accessory is essential for control circuits, enabling the interlocking, signaling, and control of peripheral functions in motor control and industrial automation applications. It is a standard component in the trusted SIRIUS modular system, ensuring exceptional performance and mechanical endurance.

Key Features and Technical Specification

• Product Number: 3RH1921-1CA10
• Product Brand Name: SIRIUS
• Product Type: Auxiliary Switch Block
• Mounting: Front-side snap-on mounting for quick, tool-free installation.
• Contact Configuration: 1 Normally Open (1 NO) instantaneous contact.
• Terminal Type: Screw terminals for secure and robust wiring connections.
• Compatibility: Specifically designed for use with Siemens 3RT1 series contactors (Sizes S0 to S12, including 3RT10 contactors and 3RH1 contactor relays).
• Electrical Ratings (Typical AC-15): 6A at 230V AC; 3A at 400V AC.
• Insulation Voltage (Rated): 690 V.
• Surge Voltage Resistance: 6 kV.
• Mechanical Service Life: Up to 10 million operating cycles.
• Protection Class: IP20 (on the front).
• Standards: Conforms to DIN EN 50005, IEC 60947-5-1.
• Ambient Temperature (Operation): −25∘C to +60∘C.
• Dimensions (Approximate): 38mm (H) x 10mm (W) x 51mm (D).

Benefit

1. Enhanced Contactor Functionality: Easily adds an instantaneous NO contact to your 3RT1 contactor, expanding its capability for complex control tasks like feedback or interlocking.
2. Simple Installation: Front-side, snap-on mounting allows for fast and easy assembly and disassembly, minimizing downtime during maintenance or upgrades.
3. Reliable Performance: Part of the proven Siemens SIRIUS line, offering a high mechanical service life and exceptional contact reliability for sustained industrial operation.
4. Secure Wiring: Screw terminals provide a robust and widely-used connection method, ensuring long-term electrical integrity.
5. Space-Saving Design: Its compact form factor maintains a small footprint on the DIN rail, optimizing panel space.

Function/Application

The 3RH1921-1CA10 auxiliary switch is used in industrial control circuits and motor control applications to:

• Signaling and Status Indication: Provide a signal (e.g., to a PLC or indicator lamp) when the main contactor is closed.
• Interlocking: Create safety or operational interlocking circuits to prevent unintended sequences of operation.
• Control Expansion: Expand the number of auxiliary contacts on a standard 3RT1 contactor to manage additional control functions.
• Suitable for: Contactor relays and power contactors in various industrial environments.

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