Contactor Relays (Auxiliary Contactors), 3RH2 (S00) with “Mechanically linked contact elements”, AC Coil$ - 3RH2131-1AF008K

Product Description

Siemens 3RH2131-1AF008K Auxiliary Contactor Relay – 110V AC Control Relay with Mechanically Linked Contact Elements

The Siemens 3RH2131-1AF008K Auxiliary Contactor Relay is a high-performance industrial switching device engineered for modern control, automation, signaling, and interlocking applications. Belonging to the globally recognized Siemens SIRIUS 3RH2 Series, this auxiliary contactor combines robust electrical performance, compact dimensions, and mechanically linked contact technology to provide exceptional reliability in demanding industrial environments. Featuring a 110V AC 50/60Hz coil, 3 Normally Open (3NO) contacts, 1 Normally Closed (1NC) contact, and mechanically linked contact elements, the 3RH2131-1AF008K is ideally suited for machine control systems, industrial automation panels, PLC interfaces, and process control applications.

One of the key advantages of the Siemens 3RH2131-1AF008K is its mechanically linked contact design, which ensures that NO and NC contacts cannot simultaneously indicate conflicting switching states. This safety-oriented feature improves operational reliability and makes the relay particularly valuable in interlocking circuits, machine safety systems, monitoring applications, and control circuits where accurate contact feedback is essential. Mechanically linked contacts help engineers design safer and more dependable automation systems.

The 3RH2131-1AF008K Auxiliary Contactor Relay features a versatile 3NO + 1NC contact configuration, offering flexible switching options for a wide variety of industrial applications. The three normally open contacts can be used for PLC input signals, control logic circuits, motor starter commands, signaling systems, and automation sequences. The normally closed contact is ideal for fault indication, shutdown circuits, interlocking functions, and status monitoring applications. This contact arrangement makes the relay highly suitable for manufacturing facilities, packaging equipment, conveyor systems, HVAC controls, process industries, water treatment plants, and energy management systems.

Designed in the compact S00 frame size, the Siemens SIRIUS 3RH2131-1AF008K delivers powerful switching performance while minimizing panel space requirements. The compact design allows control panel builders and OEMs to optimize cabinet layouts without compromising functionality. Despite its space-saving footprint, the relay supports demanding industrial control applications with a rated operational current of up to 10A AC-15 at 230V.

The relay operates with a 110V AC, 50/60Hz control coil, making it suitable for a wide range of industrial control systems. Siemens engineering ensures reliable operation across varying supply conditions, with a control voltage operating range of approximately 0.8 to 1.1 times the rated voltage at 50Hz and 0.85 to 1.1 times the rated voltage at 60Hz. This wide tolerance helps maintain stable switching performance and improves system reliability.

A major benefit of the 3RH2131-1AF008K Auxiliary Contactor is its robust screw terminal connection technology. Screw terminals provide secure conductor retention, excellent resistance to vibration, and dependable long-term electrical performance. This connection method simplifies installation, reduces maintenance requirements, and ensures reliable operation even in harsh industrial environments.

As part of the modular Siemens SIRIUS control portfolio, the 3RH2131-1AF008K supports compatibility with a variety of Siemens accessories, including auxiliary contact blocks, surge suppressors, and mounting accessories. This modular approach allows engineers to customize control systems according to application requirements while maintaining standardized Siemens components throughout the installation. The result is simplified engineering, easier maintenance, and reduced spare-parts inventory.

The Siemens 3RH2131-1AF008K is engineered for long service life and exceptional durability. Siemens specifies a mechanical endurance of up to 30 million operating cycles, making it suitable for high-frequency switching applications. The relay also features a rated insulation voltage of 690V, rated impulse withstand voltage of 6kV, and compliance with international standards including IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1. These characteristics ensure reliable operation even in demanding industrial environments.

Industrial automation professionals trust the Siemens 3RH2131-1AF008K Auxiliary Contactor Relay for machine automation, control panels, PLC interfacing, industrial signaling, process control systems, and safety interlocking applications. Its combination of mechanically linked contacts, compact size, robust construction, and Siemens engineering excellence makes it a preferred solution for modern automation projects.

At SBsmart.in, we provide genuine Siemens industrial automation and control products trusted by OEMs, panel builders, system integrators, electrical contractors, and industrial buyers throughout India. When you choose the Siemens 3RH2131-1AF008K, you receive an authentic Siemens SIRIUS auxiliary contactor engineered for long-term reliability, superior performance, and seamless integration into industrial automation systems.