Siemens SIRIUS 3RH1921-2JE11 Auxiliary Switch Block, Lateral Mount, Spring-Type Terminal, For 3RT1 Contactors Original Brand New

Overview

The Siemens SIRIUS 3RH1921-2JE11 is a high-quality, second lateral auxiliary switch block designed for seamless integration with Siemens 3RT1 contactors and contactor relays. This essential accessory provides reliable signaling and interlocking functions in industrial control applications.

Featuring one normally open (1 NO) and one normally closed (1 NC) instantaneous contact, this auxiliary switch ensures precise operational feedback. The secure and efficient spring-type terminal connection makes wiring quick and robust, minimizing downtime and maintenance effort. Part of the trusted SIRIUS modular system, the 3RH1921-2JE11 guarantees compatibility and long-term performance.

Key Features & Technical Specification

• Product Type: Auxiliary Switch Block (Second Lateral Mount)
• Manufacturer: Siemens
• Series: SIRIUS 3RH19
• Article Number: 3RH1921-2JE11
• Contact Configuration: 1 NO (Normally Open) + 1 NC (Normally Closed)
• Mounting Position: Second Lateral (Side Mount)
• Connection Type: Spring-Type Terminal (Spring-Loaded Terminals)
• Compatibility: Specifically designed for use with 3RT1 Contactors (including 3RT10, 3RT12, 3RT145, 3RT146, 3RT147)
• Insulation Voltage (Rated): $500\text{ V}$ (with pollution degree 3)
• Protection Class: IP20 on the front
• Mechanical Service Life (Typical): $5,000,000$ operating cycles
• Weight: Approximately $0.053\text{ kg}$

Benefit

1. Enhanced Control: Adds an immediate secondary circuit for signaling, interlocking, and control logic to your main contactor operation.
2. Fast and Reliable Wiring: The spring-type terminals offer a vibration-proof connection that is significantly faster to install than traditional screw terminals, leading to reduced installation time and improved system reliability.
3. Seamless Integration: Perfectly compatible with the Siemens 3RT1 range, ensuring a secure and simple snap-on mounting process.
4. Space Efficiency: The lateral (side) mounting design helps maintain a compact footprint within your control panel.
5. Robust and Durable: Built to Siemens’ high industrial standards, offering a long mechanical service life and reliable operation in demanding environments.

Function / Application

The Siemens 3RH1921-2JE11 functions as a critical component for expanding the auxiliary contacts of the main 3RT1 power contactor or contactor relay. It is typically used in the following applications:

• Signaling: Providing feedback to PLCs, HMI, or indicator lamps to show the contactor’s current status (ON/OFF).
• Interlocking: Creating safety or sequence control logic by ensuring certain operations can only occur when the contactor is in a specific state.
• Control Circuit Expansion: Supplying extra contacts for auxiliary circuits, control power, or complex automation sequences.
• Industrial Automation: Essential in motor control centers, machinery, and electrical panels requiring precise and reliable switching and monitoring.

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