The Siemens 3RH2122-1AB008K Auxiliary Contactor Relay is a high-performance industrial switching solution designed for advanced control, signaling, interlocking, monitoring, and automation applications. As part of the globally trusted Siemens SIRIUS 3RH2 Series, this auxiliary contactor is engineered to deliver dependable switching performance, enhanced operational safety, and long service life in demanding industrial environments.
Featuring a 24V AC (50/60Hz) control coil, 2 Normally Open (2NO) contacts, 2 Normally Closed (2NC) contacts, and mechanically linked contact elements, the 3RH2122-1AB008K is ideal for use in control panels, PLC systems, motor control centers, machine automation, HVAC systems, process industries, and industrial infrastructure projects. The relay is designed in the compact S00 frame size and utilizes reliable screw terminal connections for secure installation and maintenance.
One of the key advantages of the Siemens 3RH2122-1AB008K Auxiliary Contactor is its mechanically linked contact technology. This design ensures that normally open and normally closed contacts cannot simultaneously indicate conflicting switching positions. Such functionality is especially important in safety-related applications, machine interlocking systems, monitoring circuits, and automation processes where accurate status feedback is essential. Siemens developed these contactors to support dependable control architectures and improve operational safety in industrial environments.
The relay's 2NO + 2NC contact arrangement provides exceptional flexibility for control engineers and panel builders. The normally open contacts can be used for PLC interfacing, automation commands, signaling circuits, machine sequencing, and control logic applications. The normally closed contacts are suitable for fault indication, safety interlocking, shutdown circuits, alarm systems, and status monitoring. This balanced contact configuration helps simplify control circuit design while reducing the need for additional switching devices.
The 24V AC control coil makes the 3RH2122-1AB008K particularly suitable for low-voltage industrial control systems. It integrates seamlessly with automation panels, machine controls, and industrial switching systems while maintaining reliable switching performance under continuous operation. Siemens SIRIUS contactor relays are widely recognized for their high contact reliability, making them suitable for both standard automation applications and more demanding control environments.
Built within the compact S00 size, the relay offers excellent space efficiency for modern control panels. Despite its compact footprint, the device delivers a 10A operational current rating and supports control voltages up to 690V AC across its contact system. This combination of compact dimensions and industrial-grade performance makes it an ideal choice for OEMs, machine manufacturers, panel builders, and industrial maintenance teams.
The relay incorporates screw terminal technology, providing secure conductor retention, excellent vibration resistance, and long-term electrical reliability. This proven connection method simplifies installation and maintenance while ensuring dependable operation even in harsh industrial environments. Siemens contactor relays are also designed with finger-safe terminals and climate-resistant construction, helping improve safety and reliability throughout the product lifecycle.
The Siemens 3RH2122-1AB008K complies with internationally recognized industrial standards and offers a rated insulation voltage of 690V, high mechanical durability, and reliable switching performance. Similar SIRIUS 3RH2 relays are designed for up to 30 million mechanical operating cycles, helping reduce downtime and maintenance costs in critical industrial applications.
As part of the modular Siemens SIRIUS platform, the relay supports integration with auxiliary contact blocks, surge suppressors, and other Siemens accessories. This modular design enables future expansion, simplifies engineering, and helps standardize automation systems across industrial facilities.
At SBsmart.in, we supply genuine Siemens industrial automation products trusted by OEMs, system integrators, panel builders, electrical contractors, and industrial buyers across India. When you choose the Siemens 3RH2122-1AB008K Auxiliary Contactor Relay, you receive an authentic Siemens solution engineered for reliability, operational safety, and long-term industrial performance.
| Specification | Details |
|---|---|
| Product Name | Auxiliary Contactor Relay |
| Brand | Siemens |
| Series | SIRIUS 3RH2 |
| Model Number | 3RH2122-1AB008K |
| SKU | 3RH2122-1AB008K |
| Product Type | Auxiliary Contactor |
| Frame Size | S00 |
| Contact Configuration | 2NO + 2NC |
| Number of Contacts | 4 Pole |
| Contact Design | Mechanically Linked Contact Elements |
| Coil Voltage | 24V AC |
| Frequency | 50/60 Hz |
| Connection Type | Screw Terminals |
| Mounting Type | DIN Rail / Panel Mount |
| Operational Current (Ie) | 10 A |
| Contact Voltage | 690V AC |
| Rated Insulation Voltage (Ui) | 690 V |
| Mechanical Endurance | Up to 30 Million Operations |
| Width | 45 mm |
| Height | 58 mm |
| Depth | 73 mm |
| Minimum Operating Temperature | -25°C |
| Maximum Operating Temperature | +60°C |
| Protection Class | IP20 |
| Standards | IEC Compliant |
| Applications | Control Panels, PLC Systems, Automation & Interlocking |
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