Siemens 3RH1921-1CD01 Front-Side Auxiliary Switch, Delayed, Screw Terminal for 3RT1 Contactors Original Brand New

Overview

The Siemens 3RH1921-1CD01 is a high-performance front-side auxiliary switch block from the SIRIUS family, engineered to extend the functionality of 3RT1 series power contactors.

This essential control gear accessory features 1 Normally Closed (NC) contact and is specifically designed with a delayed switching function (Late Break). Its snap-on front-mounting design ensures quick, tool-free installation, while the robust screw terminals provide a secure and reliable electrical connection. Ideal for complex control circuits where precise timing and dependable signaling are crucial.

Benefits & Advantages

• Enhanced Control: Adds a crucial delayed NC signaling point to your main contactor, enabling sophisticated control logic and sequence timing.
• Reliable Performance: Part of the proven Siemens SIRIUS family, guaranteeing high electrical endurance and mechanical service life.
• Easy Installation: Designed for simple snap-on front mounting to the compatible 3RT1 contactors, reducing installation time and complexity.
• Secure Connection: Screw terminals allow for the secure connection of solid or finely stranded conductors, ensuring stable operation.
• Space-Saving Design: Front-mounting optimizes panel space compared to side-mounted alternatives.

Function & Application

The 3RH1921-1CD01 auxiliary switch provides a delayed signal indicating the status of the main contactor.

1. Delayed Functionality: The NC contact on this module is a “Late Break” contact, meaning it remains closed for a short, intentional delay after the main contactor is de-energized, or opens only after the main contactor has switched. This is vital for interlocking, control sequence timing, and specific safety circuits.
2. Signaling and Interlocking: Used to send a delayed signal to PLCs, control relays, or other parts of the control circuit, ensuring that subsequent operations are executed in the correct time sequence.
3. Compatibility: Specifically engineered to integrate flawlessly with the 3RT1 series of power contactors for seamless system expansion.

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