Siemens Auxiliary switch, front side with screw, 1N/O Part number 3RH1921-1CA10

Product Overview

The Siemens auxiliary switch, front side with screw, 1 N/O, article number 3RH1921-1CA10, is a front-mounted auxiliary contact accessory designed for use with contactors from the 3RT1 series. It provides one normally open auxiliary contact for signalling, indication, or interlocking purposes in control circuits. The auxiliary switch mounts directly on the front of the contactor and uses screw terminals to ensure secure and reliable electrical connections in industrial automation and motor control applications.

Key Features

• Auxiliary switch accessory for contactors 3RT1
• Front-side mounting design
• Contact configuration: 1 normally open (1 N/O)
• Screw terminal connections for secure wiring
• Adds signalling and feedback functionality
• Compact design for easy installation on contactors
• Industrial-grade construction for control panels

Technical Specifications

• Article Number: 3RH1921-1CA10
• Product Type: Auxiliary switch
• Mounting Position: Front side of contactor
• Contact Configuration: 1 N/O
• Terminal Type: Screw terminals
• Compatible Contactor Series: 3RT1
• Rated Insulation Voltage: up to 690 V
• Surge Withstand Voltage: 6 kV
• Degree of Protection: IP20 when installed
• Operating Temperature Range: −25 °C to +60 °C
• Storage Temperature Range: −55 °C to +80 °C

Compliance & Standards

• Designed in accordance with Siemens requirements for auxiliary contact accessories
• Suitable for use in industrial control and automation circuits
• Meets applicable IEC standards for low-voltage switchgear auxiliaries

Applications

The Siemens 3RH1921-1CA10 auxiliary switch is used to extend the signalling and control capabilities of 3RT1 contactors. Typical applications include PLC input feedback, status indication, interlocking circuits, and control logic integration in motor control centres, automation panels, and industrial machinery where a normally open auxiliary contact is required.