Siemens 3RH Series Auxiliary Contact, 1NC + 1NO, 10A Contact Current Rating - 3RH1921-1EA11 This auxiliary contact extends the functionality of contactors within the Siemens SIRIUS range, featuring both Normally Closed (NC) and Normally Open (NO) contacts for operational flexibility. The snap-on mounting style enables quick installation. Features & Benefits • 10 A contact rating meets high current demands
• Snap-on mounting facilitates installation and maintenance
• Dual NC and NO auxiliary contacts allow diverse circuit configurations
• Insulation voltage rating of 500 V enhances safety
• Mechanical service life of up to 10 million cycles ensures durability
• Compact dimensions enable integration in limited spaces Applications • Utilised with 3RT10 and 3RT12 contactors to augment functionality
• Suitable for automation tasks in electrical and mechanical sectors
• Effective for circuits requiring dependable switching under load
• Performs well in environments with variable temperature conditions What is the operational temperature range for this device? The operational temperature range is from -25 to 60°C. How does the installation process work? Installation is straightforward with a snap-on design for easy attachment to compatible devices. What type of wiring connections are compatible? It accepts screw-type terminals for solid or stranded conductors, accommodating various wire sizes. Can this auxiliary contact be used in existing setups? Yes, it is designed for compatibility with specific Siemens contactors, enhancing current configurations. What is the expected lifespan in operational cycles? The mechanical service life typically reaches up to 10 million operating cycles.