Contactor Relays (Auxiliary Contactors), 3RH2 (S00) with “Mechanically linked contact elements”, AC Coil$ - 3RH2122-1AV008K

Product Description

Siemens 3RH2122-1AV008K Auxiliary Contactor Relay – 400V AC Control Relay with Mechanically Linked Contact Elements

The Siemens 3RH2122-1AV008K Auxiliary Contactor Relay is a premium industrial control component engineered to provide dependable switching, signaling, monitoring, and interlocking functions in modern automation systems. As part of the globally trusted Siemens SIRIUS 3RH2 Series, this auxiliary contactor is designed to meet the demanding requirements of industrial control panels, machine automation systems, motor control centers (MCCs), and process automation environments. Featuring a 400V AC coil, 2 Normally Open (2NO) contacts, 2 Normally Closed (2NC) contacts, and mechanically linked contact elements, the 3RH2122-1AV008K delivers exceptional reliability, operational safety, and long-term performance. The 3RH2 series is widely recognized for its compact design, robust construction, and high switching reliability.

One of the key advantages of the Siemens 3RH2122-1AV008K is its mechanically linked contact technology. This safety-oriented design ensures that normally open and normally closed contacts cannot simultaneously indicate contradictory switching states. Mechanically linked contacts are essential for applications requiring accurate feedback, dependable interlocking, and safe machine operation. This feature makes the relay particularly suitable for safety circuits, status monitoring systems, machine control logic, and automation processes where reliable contact indication is critical. Similar mechanically linked Siemens SIRIUS contactors are designed according to international industrial control standards.

The relay incorporates a versatile 2NO + 2NC contact configuration, providing engineers and panel builders with flexible switching options for a wide range of control applications. The two normally open contacts can be used for PLC inputs, machine control commands, signaling functions, automation sequences, and process control circuits. The two normally closed contacts are ideal for fault indication, emergency shutdown circuits, interlocking systems, monitoring applications, and alarm functions. This balanced contact arrangement allows complex control logic to be implemented while minimizing additional components.

The 3RH2122-1AV008K Auxiliary Contactor Relay operates with a 400V AC, 50/60Hz control coil, making it suitable for industrial facilities utilizing higher AC control voltages. AC-operated auxiliary contactors are commonly used in manufacturing plants, processing industries, utility installations, HVAC systems, material handling equipment, and power distribution applications where stable AC control circuits are available. Siemens SIRIUS control relays are designed to provide reliable operation across a wide control voltage range and demanding industrial operating conditions.

Designed in the compact S00 frame size, the Siemens 3RH2122-1AV008K offers excellent space efficiency while delivering industrial-grade switching performance. The compact dimensions allow control panel designers to maximize available cabinet space without sacrificing functionality. Despite its compact footprint, the relay supports operational currents up to 10A AC-15, making it suitable for demanding industrial control applications. The S00 frame size is widely used throughout Siemens motor control and automation systems.

The relay uses proven screw terminal connection technology, ensuring secure conductor retention and long-term electrical reliability. Screw terminals are preferred in industrial automation because they offer excellent vibration resistance, dependable electrical contact, and simplified maintenance. This robust connection method helps ensure stable performance even in harsh industrial environments where equipment reliability is essential.

The Siemens SIRIUS 3RH2122-1AV008K is engineered for long service life and exceptional durability. Similar relays within the 3RH2 family feature a rated insulation voltage of 690V, impulse withstand voltage of 6kV, and high mechanical endurance for continuous industrial operation. These characteristics ensure dependable switching performance and reduced maintenance requirements over the lifetime of the equipment.

As part of the modular Siemens SIRIUS platform, the 3RH2122-1AV008K Auxiliary Contactor supports compatibility with auxiliary contact blocks, surge suppressors, and other Siemens accessories. This modular design simplifies engineering, reduces spare-parts inventory requirements, and allows control systems to be customized according to application-specific needs. The relay can also be integrated easily into existing Siemens automation architectures.

The Siemens 3RH2122-1AV008K is widely used in industrial automation systems, control panels, machine-building projects, process industries, water treatment facilities, HVAC systems, energy management installations, and manufacturing plants. Its combination of mechanically linked contacts, reliable AC coil operation, compact construction, and Siemens engineering excellence makes it a preferred choice for automation professionals worldwide.

At SBsmart.in, we supply genuine Siemens industrial automation products trusted by OEMs, panel builders, electrical contractors, maintenance teams, and industrial buyers across India. When you purchase the Siemens 3RH2122-1AV008K Auxiliary Contactor Relay, you receive an authentic Siemens SIRIUS solution engineered for superior reliability, long operational life, and seamless integration into industrial control systems.