Siemens Auxiliary, spring terminal, 4NC Part number 3RH2911-2GA04

Product Overview

The Siemens SIRIUS auxiliary switch block 3RH2911-2GA04 is a front-mount accessory designed for size S00 contactor relays (e.g., SIRIUS 3RH2140 and 3RH2440 series). It provides four normally-closed (4 NC) auxiliary contacts via spring-loaded terminals, enabling reliable switching and feedback functions in industrial control systems.

Key Features

• Contact Configuration: 4 NC auxiliary contacts (instantaneous) for auxiliary circuits
• Mounting Style: Snap-on front-mount on size S00 contactor relays
• Terminal Type: Spring-loaded terminals for secure and rapid wiring
• Electrical Rating: Up to 10 A at 24 V AC/DC (AC-12 rating) and up to 6 A at 230 V AC (AC-15 duty) in auxiliary circuits
• Insulation Rating: 690 V AC (pollution degree 3) and 6 kV surge voltage resistance
• Mechanical Durability: Typical 10 000 000 mechanical operations / 200 000 electrical cycles at AC-15, 230 V
• Ambient Temperature Range: Operation –25 °C to +60 °C, Storage –55 °C to +80 °C

Technical Specifications

• Product Series: SIRIUS auxiliary switch blocks, 3RH29 series
• Auxiliary Contacts: 4 × NC (instantaneous) contacts
• Rated Operational Insulation Voltage (Ui): 690 V AC
• Surge Voltage Resistance: 6 kV
• Mechanical Life: 10 000 000 operations
• Electrical Endurance: 200 000 switching cycles (AC-15, 230 V)
• Dimensions (W × H × D): 36 mm × 41.5 mm × 47.7 mm
• Weight: Approx. 0.064 kg
• Protection Class: IP20 (front side)
• Mounting Method: Snap-on onto compatible S00 contactor relays

Compliance & Certifications

• IEC Standards: Positively driven operation according to IEC 60947-5-1
• Installation Rating: Designed for use on 3RH2 contactor relays as per EN 50011 coding
• RoHS Compliant: Meets Siemens substance-restriction standard since 01.10.2009
• WEEE: Take-back obligation applies

Applications

Ideal for controlling and monitoring auxiliary circuits in motor starters, automation systems, machine control cabinets, and industrial switchgear. Typically used for feedback of contactor status (open/closed), interlocking functions and indication signaling in manufacturing, material handling, and building automation environments.