Product Description

Siemens 3RH2122-1AF008K Contactor Relay – Mechanically Linked Contacts, 2 NO + 2 NC

The Siemens 3RH2122-1AF008K is a SIRIUS 3RH2 auxiliary contactor / contactor relay designed for industrial control, automation, signalling and interlocking applications. The corresponding Siemens 3RH2122-1AF00 configuration has 2 normally open (NO) and 2 normally closed (NC) contacts, a 110 V AC coil, 50/60 Hz operation, screw terminals and a compact S00 frame size. Siemens currently lists the 3RH2122-1AF00 as an active product.

Siemens SIRIUS 3RH2 Contactor Relay

The 3RH2122-1AF008K is designed 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 within 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

Mechanically Linked Contact Elements

The product is specified with mechanically linked contact elements. This feature is useful in applications where the relationship between auxiliary 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.

2 NO + 2 NC Contact Configuration

The corresponding 3RH2122-1AF00 configuration provides 2 normally open and 2 normally closed contacts in a 22E contact arrangement. Siemens confirms the 2 NO + 2 NC configuration.

This 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 specified electrical ratings.

110 V AC Coil

The corresponding Siemens 3RH2122-1AF00 uses a 110 V AC control coil and operates at 50/60 Hz. Siemens' official product data confirms the 110 V rated AC control supply.

This makes the relay suitable for compatible industrial AC control circuits.

The control voltage should always be matched with the exact product marking before installation.

Screw-Terminal Connections

The 3RH2122-1AF008K uses screw-terminal connections for the control and auxiliary circuits. Siemens identifies the corresponding article with screw terminals.

This provides a conventional wiring method for electrical panel builders and maintenance teams.

Compact S00 Design

The corresponding 3RH2122-1AF00 is a compact S00-size contactor relay. Its compact form factor is suitable for control cabinets 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

Industrial Automation Integration

The 3RH2122-1AF008K 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 contact arrangement provides several control, feedback and interlocking functions from one compact auxiliary contactor.

Applications

The Siemens 3RH2122-1AF008K 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.

Suitable for OEMs and Panel Builders

The 3RH2122-1AF008K 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, 110 V AC coil, screw terminals and compact S00 design makes it suitable for applications where reliable auxiliary switching, feedback and interlocking are required.

Key Features

• Siemens SIRIUS 3RH2 auxiliary contactor

• Article number 3RH2122-1AF008K

• Mechanically linked contact elements

• 2 NO + 2 NC contacts

• 110 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

Benefits

• Mechanically linked contacts: Supports reliable contact-state relationships for suitable monitoring and control applications.

• 2 NO + 2 NC contacts: Provides multiple auxiliary switching paths.

• 110 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.

Why Choose Siemens 3RH2122-1AF008K?

The Siemens 3RH2122-1AF008K combines mechanically linked contact elements, 2 NO + 2 NC auxiliary contacts, a 110 V AC control coil and screw-terminal connections in a compact S00 contactor relay.

The corresponding Siemens 3RH2122-1AF00 is officially specified as a 2 NO + 2 NC, 110 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.

Delivery Across India

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

Frequently Asked Questions

1. What is Siemens 3RH2122-1AF008K?

It is a Siemens SIRIUS 3RH2 auxiliary contactor/contact relay with mechanically linked contacts, 2 NO + 2 NC contacts and a 110 V AC coil.

2. What is the contact configuration?

It provides 2 normally open and 2 normally closed contacts.

3. What is the coil voltage?

The corresponding Siemens configuration uses a 110 V AC coil with 50/60 Hz operation.

4. Does it use screw terminals?

Yes. The product configuration uses screw-terminal connections.

5. What size is the contactor relay?

It is a compact S00-size contactor relay.

6. What are mechanically linked contacts used for?

They can support contact-state monitoring, interlocking, diagnostics and suitable safety-related control functions within a correctly designed system.

7. Can it be used with a PLC?

Yes. Its auxiliary contacts can be incorporated into suitable PLC feedback and control circuits, provided the electrical ratings are compatible.

8. Does it switch high-power motor loads directly?

It is an auxiliary contactor/contact relay, intended primarily for control and auxiliary circuits rather than direct high-power motor switching.

9. Where can the 3RH2122-1AF008K be used?

It can be used in industrial automation, machine-control panels, PLC interfaces, interlocking systems, production machinery and OEM control cabinets.

10. Where can I buy Siemens 3RH2122-1AF008K in India?

You can explore the Siemens product range at SB Smart for Siemens contactor relays, auxiliary contact blocks, contactors and other industrial automation products.