Contactor Relays (Auxiliary Contactors), 3RH2 (S00) with “Mechanically linked contact elements”, AC Coil$ - 3RH2122-1AF008K

Product Description

Siemens 3RH2122-1AF008K Auxiliary Contactor Relay – 110V AC Industrial Control Relay with Mechanically Linked Contacts

The Siemens 3RH2122-1AF008K Auxiliary Contactor Relay is a high-quality industrial switching device developed for modern control, signaling, monitoring, and interlocking applications. As part of the proven Siemens SIRIUS 3RH2 Series, this auxiliary contactor is engineered to provide reliable operation, compact installation, and long-term performance in demanding industrial environments. Designed with a 110V AC control coil, 2 Normally Open (2NO) contacts, 2 Normally Closed (2NC) contacts, and mechanically linked contact elements, the 3RH2122-1AF008K is an ideal solution for automation panels, motor control centers, machine control systems, PLC applications, and industrial process control installations.

A key feature of the Siemens 3RH2122-1AF008K is its mechanically linked contact design, which ensures that the normally open and normally closed contacts cannot simultaneously indicate conflicting switching states. This safety-oriented design improves operational reliability and makes the relay suitable for applications requiring dependable feedback signals, machine interlocking, safety monitoring, and control logic verification. Mechanically linked contactors are widely used in industrial automation systems where accurate status indication is critical.

The relay features a versatile 2NO + 2NC contact arrangement, providing excellent flexibility for industrial control circuits. The normally open contacts can be used for automation commands, PLC interfacing, signaling functions, motor control logic, and machine sequencing. The normally closed contacts are commonly utilized for fault indication, emergency stop circuits, alarm functions, safety interlocking, and status monitoring applications. This balanced configuration allows engineers to implement sophisticated control logic while minimizing additional components.

Operating with a 110V AC 50/60Hz control coil, the 3RH2122-1AF008K Auxiliary Contactor Relay is particularly suitable for industrial facilities utilizing 110V AC control systems. Siemens designed the SIRIUS 3RH2 range to deliver stable switching performance and high contact reliability even in demanding operating conditions. The relay is capable of supporting low-current control circuits and offers dependable operation across a wide range of industrial applications.

The Siemens SIRIUS 3RH2122-1AF008K is built within the compact S00 frame size, making it ideal for installations where control panel space is limited. Despite its compact dimensions, the relay delivers industrial-grade switching performance with a rated operational current of up to 10A and a contact voltage rating of 690V AC. This combination of compact size and high performance makes it a preferred choice among panel builders, OEMs, and automation professionals.

For secure and reliable wiring, the relay incorporates screw terminal connections. Screw terminals provide strong conductor retention, excellent resistance to vibration, and dependable long-term electrical performance. This connection technology simplifies installation and maintenance while ensuring reliable operation in challenging industrial environments. Siemens auxiliary contactors are widely recognized for their robust terminal construction and ease of integration into control systems.

Another important advantage of the 3RH2122-1AF008K is its compatibility with the modular Siemens SIRIUS platform. The relay can be expanded and customized using Siemens auxiliary contact blocks, surge suppressors, and mounting accessories. This modular architecture helps reduce engineering complexity, simplifies spare-parts management, and enables future system expansion without major redesign.

The relay is engineered to comply with internationally recognized standards including IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1. Siemens SIRIUS contactor relays are climate-resistant, finger-safe, and designed for worldwide industrial applications. Their robust construction and high mechanical endurance contribute to reduced downtime and lower maintenance costs over the product lifecycle.

The Siemens 3RH2122-1AF008K Auxiliary Contactor Relay is widely used in industrial automation systems, packaging machinery, manufacturing plants, conveyor systems, HVAC controls, water treatment facilities, material handling equipment, power distribution systems, and machine-building projects. Its combination of mechanically linked contacts, reliable AC coil operation, compact construction, and Siemens engineering excellence makes it a trusted solution for industrial control applications worldwide.

At SBsmart.in, we supply genuine Siemens industrial automation products trusted by OEMs, electrical contractors, control panel manufacturers, maintenance engineers, and industrial buyers across India. When you purchase the Siemens 3RH2122-1AF008K, you receive an authentic Siemens SIRIUS auxiliary contactor designed for maximum reliability, superior switching performance, and long-term operational efficiency.