Siemens Auxiliary switch, on the front, spring loaded, 1NO+1NC Part number 3RH2911-2HA11

Product Overview

The Siemens Auxiliary switch, on the front, spring loaded, 1NO+1NC (3RH2911-2HA11) is a reliable and compact front-mounted accessory for Siemens SIRIUS contactors and relays. Designed for easy installation, it provides one normally open and one normally closed contact for additional control or signaling functions. The spring-loaded design ensures secure contact engagement, making it ideal for industrial automation and control panel applications requiring durable and accurate auxiliary switching.

Key Features

• Front-mounted auxiliary switch for Siemens SIRIUS contactors
• Contact configuration: 1 Normally Open (1NO) + 1 Normally Closed (1NC)
• Spring-loaded mechanism for precise and reliable operation
• Quick and tool-free snap-on installation to the front of contactors
• Compact design with high mechanical endurance for frequent switching cycles
• Durable construction suitable for industrial environments
• Compliant with international control circuit standards for auxiliary switching

Technical Specifications

• Product Series: SIRIUS Auxiliary Switches (3RH2 range)
• Article Number: 3RH2911-2HA11
• Contact Configuration: 1NO + 1NC
• Mounting Type: Front-mounted on compatible contactors
• Operating Mechanism: Spring-loaded
• Rated Operating Voltage (Ue): up to 690 V AC
• Rated Current (Ie): up to 10 A (AC-12 duty)
• Switching Capacity: 3 A at AC-15 (230 V AC)
• Electrical Durability: Up to 200,000 switching operations (AC-15)
• Mechanical Endurance: Up to 10 million operations
• Protection Class: IP20 (with front-mounted installation)
• Ambient Operating Temperature: –25 °C to +60 °C

Compliance & Certifications

• Manufactured by Siemens under the SIRIUS modular control system
• Complies with IEC/EN 60947-5-1 for auxiliary switching devices
• CE and UL certified for global industrial applications

Applications

Ideal for use in control and automation systems requiring additional signaling or interlocking functions. Common applications include motor control centers, switchgear panels, and automated machinery where auxiliary switching feedback is required for monitoring and control logic. The robust design ensures dependable performance in demanding industrial environments.