Product Description

Siemens 3RH2131-1AF008K Contactor Relay – Mechanically Linked Contacts, 3 NO + 1 NC

The Siemens 3RH2131-1AF008K is an auxiliary contactor / contactor relay from the Siemens SIRIUS 3RH2 series, designed for industrial control, automation, signalling and interlocking applications. It features mechanically linked contact elements, 3 normally open (NO) and 1 normally closed (NC) instantaneous contacts, a 110 V AC coil and screw-terminal connections. The corresponding Siemens 3RH2131-1AF00 configuration is a Size S00 contactor relay rated for 110 V AC, 50/60 Hz.

Siemens SIRIUS 3RH2 Contactor Relay

The 3RH2131-1AF008K 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 contactor feedback, implement interlocking functions and support machine-control logic.

Typical applications include:

• Industrial automation

• Machine-control panels

• Motor-control circuits

• PLC interface circuits

• Electrical interlocking

• Signalling systems

• Process automation

• OEM machinery

• Control cabinets

• Auxiliary switching

Mechanically Linked Contact Elements

A key feature of the 3RH2131-1AF008K is its mechanically linked contact elements.

This mechanical linkage maintains a defined relationship between the auxiliary contact elements and can be useful in control circuits where the contact states need to be monitored reliably.

Potential applications include:

• Contactor status monitoring

• Electrical interlocking

• PLC feedback

• Machine sequencing

• Control logic

• Diagnostic circuits

• Suitable safety-related control architectures

For safety applications, the complete safety function must be designed and validated as part of the overall machine-control system.

3 NO + 1 NC Contact Configuration

The 3RH2131-1AF00 configuration provides 3 normally open and 1 normally closed instantaneous contacts, identified by Siemens as the 31E contact arrangement.

This arrangement provides multiple auxiliary switching paths for:

• Contactor feedback

• PLC inputs

• Electrical interlocking

• Relay logic

• Machine sequencing

• Status signalling

• Control-system feedback

The auxiliary contacts should always be operated within their applicable electrical ratings.

110 V AC Coil

The 3RH2131-1AF008K uses a 110 V AC control coil, with operation at 50/60 Hz. Siemens' official product data confirms the 110 V AC control supply for the corresponding 3RH2131-1AF00 configuration.

This makes it suitable for compatible industrial AC control systems.

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

Screw-Terminal Connections

The 3RH2131-1AF008K uses screw-terminal connections.

This provides a familiar wiring method for industrial panel builders and maintenance teams and supports practical installation and servicing of auxiliary control circuits.

Compact S00 Design

The corresponding 3RH2131-1AF00 configuration is a Size S00 contactor relay. Its compact design is suitable for electrical control cabinets where efficient use of panel space is important.

It can be incorporated into:

• Control cabinets

• Automation panels

• Machine-control stations

• OEM equipment

• Relay and contactor assemblies

Industrial Automation Integration

The 3RH2131-1AF008K can be integrated into industrial control systems together with:

• PLCs

• HMIs

• Motor contactors

• Overload relays

• Circuit breakers

• Pushbuttons

• Selector switches

• Sensors

• Safety components

• Other Siemens SIRIUS devices

The 3 NO + 1 NC contact arrangement allows multiple control and feedback functions from one compact auxiliary contactor.

Applications

The Siemens 3RH2131-1AF008K can be used for:

• Industrial automation

• Motor-control panels

• Auxiliary contactor circuits

• PLC signal interfacing

• Electrical interlocking

• Machine sequencing

• Production machinery

• Process automation

• Conveyor-control systems

• Pump-control circuits

• OEM control panels

• Industrial signalling

For related Siemens industrial electrical and automation products, customers can explore the Siemens product range at SB Smart.

Suitable for OEMs and Panel Builders

The 3RH2131-1AF008K is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.

Its combination of mechanically linked contact elements, 3 NO + 1 NC contacts, 110 V AC coil, screw terminals and compact S00 design makes it suitable for control and signalling applications where reliable auxiliary switching is required.

Key Features

• Siemens SIRIUS 3RH2 auxiliary contactor

• Article number 3RH2131-1AF008K

• Mechanically linked contact elements

• 3 NO + 1 NC instantaneous contacts

• 110 V AC coil

• 50/60 Hz AC operation

• Screw terminals

• Size S00

• Auxiliary contactor design

• 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 in suitable monitoring and control circuits.

• 3 NO + 1 NC configuration: 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 3RH2131-1AF008K?

The Siemens 3RH2131-1AF008K provides a compact auxiliary-contact switching solution for industrial automation and control systems.

Its mechanically linked contact elements, 3 NO + 1 NC contact configuration and 110 V AC coil make it suitable for applications requiring reliable auxiliary switching, interlocking and status feedback.

The corresponding Siemens 3RH2131-1AF00 is identified as a SIRIUS 3RH2 auxiliary contactor, 3 NO + 1 NC, 110 V AC, 50/60 Hz, S00, screw terminal.

For OEMs, panel builders and automation integrators, it provides a practical solution for control circuits where multiple auxiliary contacts are required in a compact device.

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 3RH2131-1AF008K?

It is a Siemens SIRIUS 3RH2 auxiliary contactor/contact relay with mechanically linked contacts, 3 NO + 1 NC contacts, a 110 V AC coil and screw terminals.

2. What is the contact configuration?

It provides 3 normally open and 1 normally closed instantaneous 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 terminals.

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, diagnostic 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.

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 3RH2131-1AF008K 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 3RH2131-1AF008K 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.