Siemens 3RH1921-1CD10 Front-Side Auxiliary Switch 1 NO, Screw Terminal for 3RT1 Contactors Original Brand New

Overview

The Siemens SIRIUS 3RH1921-1CD10 is a compact, high-performance auxiliary switch block designed for front-side mounting on SIRIUS 3RT1 contactors (compatible with sizes up to S3). This essential control component provides an additional switching point with a 1 Normally Open (NO) leading contact configuration. The leading (or early-make) function ensures that this contact closes fractionally before the main contactor contacts, providing crucial early signaling for control circuits. Featuring robust screw terminals for secure and reliable wiring, the 3RH1921-1CD10 is indispensable for complex control applications requiring precise timing and signal feedback.

Key Features

• Front-side auxiliary switch for easy access and monitoring

• 1 NO (Normally Open) leading contact

• Screw terminal connection for secure wiring

• Compatible with Siemens 3RT1 contactors

• Durable design for long-term industrial use

Benefit

• Ensures accurate switching signals for motor control and automation systems

• Simplifies maintenance and installation with front-side accessibility

• Provides reliable and stable operation under demanding conditions

• Enhances system safety by clearly indicating contactor status

Functionality

• Works as an auxiliary contact for signaling and control circuits

• Transmits contactor operation status to control systems or indicators

• Supports automation processes in industrial environments

Application

The 3RH1921-1CD10 is an essential accessory for any industrial control panel utilizing 3RT1 contactors, typically used in:

• Motor Control Circuits: Providing run/stop status signals to PLCs or other controllers.
• Interlock Circuits: Establishing safety logic where contact status must be confirmed before a sequence can proceed.
• Sequencing and Timing: Initiating secondary control actions just before the main power circuit is engaged.
• General Control Systems: Expanding the number of auxiliary contacts available on a standard contactor.

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