The Siemens 3RH2122-1AP008K is a SIRIUS 3RH2 auxiliary contactor / contactor relay designed for industrial control, automation, signalling and interlocking applications. It features mechanically linked contact elements, 2 normally open (NO) and 2 normally closed (NC) contacts, a 230 V AC coil, screw-terminal connections and a compact S00 frame size. Siemens' product data for the corresponding 3RH2122-1AP00 confirms this configuration and lists the article as an active product.
The 3RH2122-1AP008K is designed for switching auxiliary and control circuits in industrial electrical and automation systems rather than directly switching high-power motor loads.
It can be used to transfer control signals, provide feedback and implement electrical interlocking within machine-control and automation 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
A key feature of the 3RH2122-1AP008K is its mechanically linked contact elements.
This arrangement maintains a defined mechanical relationship between the contact elements, making the relay suitable for applications where contact-state monitoring and coordinated control are required.
Potential applications include:
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 must be designed and validated as part of the overall machine-control system.
The corresponding Siemens 3RH2122-1AP00 configuration provides 2 normally open and 2 normally closed contacts. This 22E arrangement provides multiple auxiliary switching paths for control and monitoring applications.
The contacts can be used for:
Contactor feedback
PLC inputs
Electrical interlocking
Relay logic
Machine sequencing
Status signalling
Auxiliary switching
Control-system feedback
The contacts should always be operated within their applicable electrical ratings.
The 3RH2122-1AP008K uses a 230 V AC control coil with 50/60 Hz operation. Siemens' official product data for the corresponding article confirms the 230 V AC control voltage.
This makes it suitable for compatible industrial AC control systems.
The control voltage must always be matched with the exact product marking before installation.
The contactor relay uses screw terminals, providing a conventional connection method for industrial control-panel wiring. Siemens identifies the corresponding 3RH2122-1AP00 with screw-terminal connections.
This makes the device suitable for panel builders and maintenance teams working with standard control-circuit wiring.
The 3RH2122-1AP008K belongs to the compact S00 frame size. The Siemens product data identifies the corresponding 3RH2122-1AP00 as an S00 contactor relay.
The compact design is useful in:
Control cabinets
Automation panels
Machine-control stations
OEM equipment
Relay and contactor assemblies
The 3RH2122-1AP008K can be integrated with:
PLCs
HMIs
Motor contactors
Overload relays
Circuit breakers
Pushbuttons
Selector switches
Sensors
Safety components
Other Siemens SIRIUS devices
The 2 NO + 2 NC arrangement allows several control, feedback and interlocking functions to be handled by one compact auxiliary contactor.
The Siemens 3RH2122-1AP008K 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 range available through SB Smart.
The 3RH2122-1AP008K 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, 230 V AC coil, screw terminals and compact S00 design makes it a suitable choice for auxiliary control and signalling applications.
Siemens SIRIUS 3RH2 auxiliary contactor
Article number 3RH2122-1AP008K
Mechanically linked contact elements
2 NO + 2 NC contacts
230 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.
230 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 3RH2122-1AP008K combines mechanically linked contact elements, 2 NO + 2 NC auxiliary contacts, a 230 V AC control coil and screw-terminal connections in a compact S00 contactor relay.
The corresponding Siemens 3RH2122-1AP00 is officially described as a 2 NO + 2 NC, 230 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 functions.
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 230 V AC coil.
It provides 2 normally open and 2 normally closed contacts.
The corresponding Siemens configuration uses a 230 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 | 3RH2122-1AP008K |
| SKU | 3RH2122-1AP008K |
| Product Type | Auxiliary Contactor |
| Frame Size | S00 |
| Contact Configuration | 2NO + 2NC |
| Number of Normally Open Contacts | 2 |
| Number of Normally Closed Contacts | 2 |
| Contact Design | Mechanically Linked Contact Elements |
| Coil Voltage | 230V AC |
| Frequency | 50/60 Hz |
| Control Voltage Type | AC |
| Connection Type | Screw Terminals |
| Mounting Method | DIN Rail / Panel Mount |
| Rated Operational Current AC-12 | 10 A |
| Rated Operational Current AC-15 (230V) | 10 A |
| Rated Operational Current AC-15 (400V) | 3 A |
| Rated Operational Current AC-15 (500V) | 2 A |
| Rated Operational Current AC-15 (690V) | 1 A |
| Apparent Pick-Up Power | 37 VA |
| Apparent Holding Power | 5.7 VA |
| Rated Insulation Voltage (Ui) | 690 V |
| Rated Impulse Withstand Voltage (Uimp) | 6 kV |
| Mechanical Endurance | Up to 30 Million Operations |
| Protection Class | IP20 |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -55°C to +80°C |
| Width | 45 mm |
| Height | 57.5 mm |
| Depth | 73 mm |
| Safety Function Suitable | Yes |
| Positively Driven Operation | Yes |
| Standards Compliance | IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1 |
| Product Family | Siemens SIRIUS Auxiliary Contactors |
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