The Siemens 3RH2122-1AB008K is a SIRIUS 3RH2 auxiliary contactor / contactor relay designed for industrial control, automation, signalling and interlocking applications. The corresponding Siemens 3RH2122-1AB00 configuration features 2 normally open (NO) and 2 normally closed (NC) contacts, a 24 V AC coil, 50/60 Hz operation, screw terminals and a compact S00 frame size. Siemens currently lists the 3RH2122-1AB00 as an active product.
The 3RH2122-1AB008K is intended for switching auxiliary and control circuits rather than directly switching high-power motor loads.
It can be used to transfer control signals, provide feedback and implement electrical interlocking in industrial automation and machine-control systems.
Typical applications include:
Industrial automation
Machine-control panels
PLC interface circuits
Motor-control circuits
Electrical interlocking
Signalling systems
Process automation
OEM machinery
Control cabinets
Auxiliary switching
The product description specifies mechanically linked contact elements. This arrangement is useful in control applications where the relationship between contact states needs to be monitored reliably.
Mechanically linked contacts can support:
Contactor status monitoring
Electrical interlocking
PLC feedback
Machine sequencing
Diagnostic circuits
Control logic
Suitable safety-related control architectures
For safety-related applications, the complete safety function should be designed and validated as part of the overall machine-control system.
The corresponding 3RH2122-1AB00 configuration provides 2 normally open and 2 normally closed contacts in a 22E contact arrangement. Siemens confirms the 2 NO + 2 NC configuration.
This arrangement provides multiple auxiliary switching paths for:
Contactor feedback
PLC inputs
Electrical interlocking
Relay logic
Machine sequencing
Status signalling
Auxiliary switching
Control-system feedback
The contacts should always be used within their applicable electrical ratings.
The 3RH2122-1AB008K uses a 24 V AC control coil with 50/60 Hz operation. Siemens' official product data confirms this control voltage and frequency.
This makes it suitable for compatible industrial AC control systems.
The control voltage should always be matched with the exact product marking before installation.
The contactor relay uses screw-terminal connections, providing a conventional wiring method for industrial control-panel applications. Siemens identifies the 3RH2122-1AB00 configuration with screw terminals.
This makes it convenient for panel builders and maintenance teams working with standard auxiliary-control wiring.
The corresponding 3RH2122-1AB00 is a Size S00 contactor relay. Its compact format is suitable for control cabinets and machine-control panels where efficient use of panel space is important.
It can be integrated into:
Control cabinets
Automation panels
Machine-control stations
OEM equipment
Relay and contactor assemblies
The 3RH2122-1AB008K can be integrated with:
PLCs
HMIs
Motor contactors
Overload relays
Circuit breakers
Pushbuttons
Selector switches
Sensors
Safety components
Other Siemens SIRIUS devices
Its 2 NO + 2 NC arrangement provides multiple control, feedback and interlocking functions from one compact auxiliary contactor.
The Siemens 3RH2122-1AB008K can be used for:
Industrial automation
Motor-control panels
PLC signal interfacing
Electrical interlocking
Machine sequencing
Production machinery
Process automation
Conveyor-control systems
Pump-control circuits
OEM control panels
Industrial signalling
Auxiliary switching
For related Siemens industrial electrical and automation products, customers can explore the Siemens product range at SB Smart.
The 3RH2122-1AB008K is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.
Its combination of mechanically linked contact elements, 2 NO + 2 NC contacts, 24 V AC coil, screw terminals and compact S00 design makes it suitable for applications requiring reliable auxiliary switching, feedback and interlocking.
Siemens SIRIUS 3RH2 auxiliary contactor
Article number 3RH2122-1AB008K
Mechanically linked contact elements
2 NO + 2 NC contacts
24 V AC coil
50/60 Hz AC operation
Screw terminals
Size S00
22E contact arrangement
Suitable for electrical interlocking
Suitable for PLC feedback
Suitable for machine sequencing
Suitable for industrial automation
Suitable for OEM control panels
Mechanically linked contacts: Supports reliable contact-state relationships for suitable monitoring and control applications.
2 NO + 2 NC contacts: Provides multiple auxiliary switching paths.
24 V AC coil: Suitable for compatible industrial AC control systems.
Screw terminals: Provides a familiar industrial wiring method.
Compact S00 size: Helps optimize control-panel space.
Flexible control logic: Supports feedback, interlocking, signalling and sequencing.
Automation integration: Suitable for PLC-based control systems.
OEM-friendly: Suitable for standardized machine-control panel designs.
The Siemens 3RH2122-1AB008K combines mechanically linked contact elements, 2 NO + 2 NC auxiliary contacts, a 24 V AC control coil and screw-terminal connections in a compact S00 contactor relay.
The corresponding Siemens 3RH2122-1AB00 is officially specified as a 2 NO + 2 NC, 24 V AC, 50/60 Hz, screw-terminal, S00 contactor relay and is currently listed as an active product.
For OEMs, panel builders and automation integrators, it provides a practical solution for auxiliary switching, feedback, signalling and interlocking applications.
SB Smart supplies Siemens industrial electrical and automation products across Faridabad, Gurgaon/Gurugram, Delhi NCR, Haryana, Noida, Punjab, Mumbai and all major cities across India.
Major delivery locations include:
Faridabad
Gurgaon/Gurugram
Delhi
Delhi NCR
Noida
Greater Noida
Haryana
Punjab
Mumbai
Pune
Ahmedabad
Bengaluru
Hyderabad
Chennai
Kolkata
Jaipur
Chandigarh
Lucknow
Indore
Surat
Vadodara
Nagpur
Coimbatore
And other major cities across India
It is a Siemens SIRIUS 3RH2 auxiliary contactor/contact relay with mechanically linked contacts, 2 NO + 2 NC contacts and a 24 V AC coil.
It provides 2 normally open and 2 normally closed contacts.
The corresponding Siemens configuration uses a 24 V AC coil with 50/60 Hz operation.
Yes. The product configuration uses screw-terminal connections.
It is a compact S00-size contactor relay.
They can support contact-state monitoring, interlocking, diagnostics and suitable safety-related control functions within a correctly designed system.
Yes. Its auxiliary contacts can be incorporated into suitable PLC feedback and control circuits, provided the electrical ratings are compatible.
It is an auxiliary contactor/contact relay, intended primarily for control and auxiliary circuits rather than direct high-power motor switching.
It can be used in industrial automation, machine-control panels, PLC interfaces, interlocking systems, production machinery and OEM control cabinets.
You can explore the Siemens product range at SB Smart for Siemens contactor relays, auxiliary contact blocks, contactors and other industrial automation products.
| 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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