Overview

The Siemens 3RH1921-2JA11 is a second lateral auxiliary switch block from the SIRIUS modular system, designed to seamlessly integrate with Siemens 3RT1 contactors and 3RH1 contactor relays. This essential accessory expands the control and signaling capabilities of your contactor, providing reliable and instantaneous switching operations.

It is configured with one Normally Open (1 NO) and one Normally Closed (1 NC) instantaneous contact, offering versatility for various control applications. The use of spring-type terminals (cage clamp connection) ensures quick, secure, and vibration-proof wiring, significantly reducing installation time and maintenance effort in industrial environments.

Benefit

• Easy Expansion: Effortlessly add supplementary contacts to your existing 3RT1 contactor for expanded control and monitoring functions.
• Rapid Wiring: The innovative spring-type terminals (cage clamp) provide a maintenance-free, secure connection that is faster to wire than traditional screw terminals.
• High Reliability: Designed for a long service life with high mechanical and electrical endurance (typically 10 million mechanical cycles).
• Space-Saving Design: As a lateral (side) mounting accessory, it adds minimal front-panel depth, helping maintain a compact panel layout.
• Genuine Siemens Quality: Part of the trusted SIRIUS family, ensuring performance and compatibility in demanding industrial automation and control systems.

Application

The 3RH1921-2JA11 auxiliary switch is commonly used in:

• Control circuits for motor starters.
• Feedback loops and status signaling.
• Interlocking circuits for safety and sequence control.
• General industrial automation and low-voltage switchgear.

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