Contactor Relays (Auxiliary Contactors), 3RH2 (S00) with “Mechanically linked contact elements”, AC Coil$ - 3RH2122-1AP008K

Product Description

Siemens 3RH2122-1AP008K Auxiliary Contactor Relay – 230V AC Control Relay with Mechanically Linked Contact Elements

The Siemens 3RH2122-1AP008K Auxiliary Contactor Relay is a premium industrial control component engineered to deliver reliable switching, signaling, monitoring, and interlocking functions in demanding automation environments. Part of the globally trusted Siemens SIRIUS 3RH2 Series, this auxiliary contactor combines compact design, robust performance, and mechanically linked contact technology to provide enhanced safety and operational reliability. Equipped with a 230V AC 50/60Hz coil, 2 Normally Open (2NO) contacts, 2 Normally Closed (2NC) contacts, and mechanically linked contact elements, the 3RH2122-1AP008K is an ideal solution for industrial control panels, machine automation systems, motor control centers, PLC applications, and process control installations.

One of the most important features of the Siemens 3RH2122-1AP008K is its mechanically linked contact system. This design ensures that the normally open and normally closed contacts cannot simultaneously indicate conflicting switching positions. Mechanically linked contacts are particularly valuable in safety circuits, machine monitoring systems, interlocking functions, and automation applications where accurate status feedback is critical. Siemens also specifies positively driven operation according to IEC standards, making this auxiliary contactor suitable for safety-related switching applications.

The relay features a highly versatile 2NO + 2NC contact configuration, enabling flexible integration into a wide variety of industrial control circuits. The two normally open contacts can be used for PLC interfacing, automation sequences, signaling functions, motor control logic, and machine commands. The two normally closed contacts are ideal for fault indication, emergency shutdown systems, interlocking circuits, alarm systems, and monitoring applications. This balanced contact arrangement allows engineers to create efficient control architectures while minimizing the need for additional auxiliary devices.

The Siemens 3RH2122-1AP008K Auxiliary Contactor Relay operates with a 230V AC control voltage at 50/60Hz, making it suitable for industrial facilities using standard AC control circuits. Siemens specifies an operating voltage range of 0.8–1.1 times the rated voltage at 50Hz and 0.85–1.1 times the rated voltage at 60Hz, ensuring dependable performance even when control voltage fluctuations occur. The relay features an apparent pick-up power of approximately 37 VA and a holding power of 5.7 VA, providing reliable switching and energy-efficient operation.

Designed in the compact S00 frame size, the 3RH2122-1AP008K offers excellent space utilization within control panels and automation cabinets. Despite its compact footprint, the relay delivers industrial-grade switching capability with a rated operational current of 10A AC-15 at 230V. The space-saving design makes it a preferred choice for OEMs, panel builders, and automation engineers seeking maximum functionality in limited cabinet space.

The relay utilizes durable screw terminal connections, ensuring secure conductor retention and dependable long-term electrical performance. Screw terminals remain one of the most widely preferred connection technologies in industrial control systems because of their vibration resistance, serviceability, and reliable electrical contact. This design simplifies installation, maintenance, and future system modifications.

Engineered according to Siemens' rigorous industrial standards, the 3RH2122-1AP008K Auxiliary Contactor offers a rated insulation voltage of 690V, impulse withstand voltage of 6kV, and an impressive mechanical endurance of up to 30 million operating cycles. These characteristics make the relay suitable for continuous-duty industrial applications where reliability and uptime are critical. The relay also features IP20 protection and is designed for operation in ambient temperatures ranging from -25°C to +60°C.

As part of the modular Siemens SIRIUS platform, the 3RH2122-1AP008K supports compatibility with a wide range of Siemens accessories, including auxiliary contact blocks, surge suppressors, and mounting accessories. This modular approach simplifies engineering, reduces spare-parts inventory requirements, and allows control systems to be expanded according to future operational needs.

The Siemens 3RH2122-1AP008K Auxiliary Contactor Relay is widely used in machine automation, manufacturing plants, HVAC systems, water treatment facilities, conveyor systems, packaging machinery, process industries, power distribution systems, and industrial control panels. Its combination of mechanically linked contacts, dependable AC coil operation, compact design, and Siemens engineering excellence makes it a trusted solution for modern industrial automation projects.

At SBsmart.in, we provide genuine Siemens industrial automation products trusted by OEMs, panel builders, maintenance teams, electrical contractors, and industrial buyers across India. When you purchase the Siemens 3RH2122-1AP008K Auxiliary Contactor Relay, you receive an authentic Siemens SIRIUS product engineered for long-term reliability, superior switching performance, and seamless integration into industrial control systems.