Siemens Auxiliary, spring-loaded terminal, 2NC

Product Overview

The Siemens SIRIUS auxiliary switch block 3RH2911-2HA02 is designed for front-mount attachment to size S00 contactors and relays. It features two normally-closed (2 NC) instantaneous auxiliary contacts, spring-loaded terminals, and supports integration with Siemens 3RT2 contactors and 3RH2 relay series. With compact dimensions and robust electrical ratings, it provides reliable status feedback and control circuit integration in industrial switching applications.

Key Features

• Contact Configuration: 2 NC instantaneous auxiliary contacts (no NO contacts)
• Mounting Style: Snap-on mounting to the front of size S00 contactors or relays
• Connection Type: Spring-loaded terminals for fast, secure wiring
• High Insulation Rating: 690 V AC rated insulation voltage (pollution degree 3)
• Surge Withstand Voltage: 6 kV for enhanced electrical robustness
• Compact Dimensions: Width 36 mm × Height 41.5 mm × Depth 47.7 mm
• Mounting Width: 36 mm (approx. 2 module widths) for space-efficient panel installation
• Ambient Temperature Range: –25 °C to +60 °C (operation); –55 °C to +80 °C (storage)

Technical Specifications

• Product Series: SIRIUS 3RH29 auxiliary switch blocks
• Auxiliary Circuit Contacts: 2 × NC instantaneous
• Rated Insulation Voltage (Ui): 690 V AC (pollution degree 3)
• Surge Voltage Resistance: 6 kV
• Mechanical Endurance (Typical): 10 000 000 operations
• Electrical Endurance (AC-15, 230 V): 200 000 operations (typical)
• Auxiliary Contact Ratings (AC-12): 10 A at 24 V or 230 V
• Auxiliary Contact Ratings (AC-15): 6 A at 24 V/230 V, 3 A at 400 V, 1 A at 690 V
• Auxiliary Contact Ratings (DC-12): 10 A at 24 V etc.
• Termination Size: Solid/stranded 0.5…2.5 mm², spring-type terminals (AWG 20…14)
• Protection Class: IP20 (front, as installed)
• Country of Origin: Germany

Compliance & Certifications

• Functional Certification: Mirror contact according to IEC 60947-4-1; positively driven operation according to IEC 60947-5-1
• CE Marking: Complies with European Low-Voltage and Machinery Directives
• RoHS Compliant: Conforms to Siemens restriction on hazardous substances (since 01 Oct 2009)
• WEEE: Take-back obligation applies in applicable regions
• Product Classification: Industrial auxiliary switch module

Applications

Ideal as an auxiliary switch block for contactor or relay circuits where two normally-closed contacts are required for feedback, interlocking, or signalling. Commonly used in industrial control panels, motor starters, automation systems, building services installations, and switchgear where reliable status indication or safe circuit separation is needed.