Siemens 3RH1921-1EA11 Auxiliary Switch Block, Side Mount, Screw Terminal, for SIRIUS 3RT1 Contactors Original Brand New

Overview: Reliable Lateral Auxiliary Contact for SIRIUS Contactors

The Siemens 3RH1921-1EA11 is a high-quality, 2-pole lateral auxiliary switch block from the SIRIUS line, designed to easily expand the contact capacity of your Siemens 3RT1 power contactors and 3RH1 contactor relays. Featuring a 1 Normally Open (NO) and 1 Normally Closed (NC) instantaneous contact configuration, this essential component provides reliable switching for control and signaling circuits.

Its robust design with classic screw terminals ensures a secure and durable electrical connection, making it ideal for various industrial control applications. The lateral snap-on mounting allows for quick and effortless installation on the side of compatible contactors (sizes S0 to S12).

Key Product Features

• Product Number: 3RH1921-1EA11 (Siemens SIRIUS)
• Contact Configuration: 1 NO (Normally Open) + 1 NC (Normally Closed) instantaneous contacts.
• Mounting Type: First Lateral/Side Mount (Snap-on)
• Connection Type: Screw Terminals (Robust and secure)
• Compatibility: Specifically engineered for use with Siemens SIRIUS 3RT1 Contactors and 3RH1 Contactors/Relays (Suitable for S0 to S12 sizes).
• Poles: 2-Pole design
• Application Suitability: Contactor relays and power contactors, for switching motors.
• High Reliability: Exceptional contact reliability (1 faulty switching per 100 million at $17\text{V},1\text{mA}$).
• Durability: Long mechanical service life of typically $10,000,000$ operating cycles.
• Safety: Features mirror contact function according to IEC 60947-4-1 (when used with 3RT1).
• Protection Class: IP20 on the front.

Benefit

• Seamless System Expansion: Effortlessly adds necessary auxiliary contacts to your existing 3RT1 motor contactors, providing flexibility for control and signaling tasks.
• Time-Saving Installation: The lateral, snap-on mounting significantly reduces installation time and effort, promoting faster maintenance.
• Guaranteed Compatibility: Designed and manufactured by Siemens SIRIUS, ensuring perfect compatibility and optimal performance with 3RT1 contactors.
• Secure Wiring: Traditional screw terminals provide a trusted and strong connection, minimizing the risk of wiring issues in high-vibration industrial settings.
• Enhanced Diagnostics: The $1\text{NO}+1\text{NC}$ configuration is perfect for interlocking, status feedback, and complex control circuit requirements.

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