Siemens Auxiliary contact, 2NC + 2NO, snap-on, spring-loaded terminals Part number 3RH2911-2HA22

Product Overview

The Siemens 3RH2911-2HA22 is a SIRIUS auxiliary switch block designed for snap-on mounting to contactors and relays. It provides a 4-pole switching block with 2 normally open (NO) and 2 normally closed (NC) contacts, intended for use in industrial control assemblies to monitor and signal the status of main devices.

Key Features

• Auxiliary switch block compatible with SIRIUS contactors and relays
• 4-pole configuration: 2 NO + 2 NC contacts
• Snap-on mounting for quick installation
• Spring-loaded terminals for reliable connection
• Compact design for efficient panel integration
• Suitable for monitoring, signalling and auxiliary switching tasks in automation systems

Technical Specifications

• Product Series: SIRIUS auxiliary switch block
• Article Number: 3RH2911-2HA22
• Poles / Contacts: 4 poles (2 NO + 2 NC)
• Mounting Type: Snap-on mounting to compatible SIRIUS devices
• Terminal Type: Spring-loaded terminals
• Insulation Voltage: 690 V AC (pollution degree 3)
• Surge Voltage Resistance: 6 kV
• Mechanical Service Life: Typically 10,000,000 operations
• Ambient Operating Temperature: –25 °C to +60 °C
• Weight: ~0.065 kg

Compliance & Certifications

• Manufactured in accordance with Siemens SIRIUS accessory standards
• Designed for use in industrial automation control panels and switchgear
• Suitable for reliable auxiliary switching and signal-monitoring functions

Applications

Ideal for mounting alongside SIRIUS contactors and relays in control panels, distribution boards and automation systems where it is necessary to signal or monitor switching operations. Commonly used to provide auxiliary outputs for diagnostics, status signalling or interlock functions in manufacturing plants, infrastructure installations and process control systems.