Product Description

Siemens 3RH2911-2GA31 Auxiliary Contact Block – 3 NO + 1 NC

The Siemens 3RH2911-2GA31 is a front-mountable auxiliary contact block from the Siemens SIRIUS range, designed specifically for compatible 3RH2140 and 3RH2440 contactor relays. It provides 3 normally open (NO) and 1 normally closed (NC) instantaneous auxiliary contacts, with spring-loaded terminals and a physically coded design for the specified contactor relays.

This auxiliary contact block is designed to expand the control, interlocking and signalling capabilities of compatible SIRIUS contactor relays without changing their main switching function.

Siemens SIRIUS Auxiliary Contact Block

The 3RH2911-2GA31 provides additional auxiliary contacts for industrial control and automation circuits.

These contacts can be used independently of the main switching circuit for applications such as:

• Contactor-status feedback

• PLC input signals

• Electrical interlocking

• Control-circuit logic

• Machine sequencing

• Auxiliary signalling

• Relay logic

• Industrial automation

Siemens specifies this particular article for use with 3RH2140 and 3RH2440 contactor relays, in accordance with the stated EN 50011 compatibility arrangement.

3 NO + 1 NC Auxiliary Contacts

The 3RH2911-2GA31 provides a total of 4 instantaneous auxiliary contacts:

3 NO + 1 NC

The contact paths are:

• 53/54 – NO

• 61/62 – NC

• 73/74 – NO

• 83/84 – NO

This combination provides flexibility for control, feedback, signalling and interlocking circuits.

Typical applications include:

• Contactor relay status feedback

• PLC monitoring

• Electrical interlocking

• Auxiliary signalling

• Machine sequencing

• Control-system logic

• Alarm or status circuits

Front-Mounting Design

The 3RH2911-2GA31 is designed to snap onto the front of compatible 3RH2140 and 3RH2440 contactor relays.

The front-mounted arrangement allows additional auxiliary contacts to be added directly to the contactor relay while maintaining a compact control-panel configuration. Siemens identifies it as a front auxiliary switch for these specific contactor-relay types.

This makes it suitable for:

• Machine-control panels

• Motor-control circuits

• Compact automation cabinets

• OEM control systems

• Industrial electrical assemblies

Spring-Loaded Terminals

The product uses spring-loaded terminal connections, providing a practical wiring method for industrial control circuits. Siemens specifies spring-loaded terminals for the 3RH2911-2GA31.

This connection method can help simplify panel wiring and support consistent control-panel assembly.

Physically Coded Design

The 3RH2911-2GA31 uses a physically coded configuration, helping ensure the auxiliary block is matched to the specified contactor-relay arrangement.

It is specifically identified for:

• 3RH2140

• 3RH2440

The compatibility of the exact auxiliary block should always be checked against the contactor-relay article number before installation.

Instantaneous Auxiliary Contacts

All four auxiliary contacts in this configuration are instantaneous. Siemens specifies 3 instantaneous NO contacts and 1 instantaneous NC contact.

This makes the device suitable for immediate contactor-relay status feedback, interlocking and control functions.

Industrial Automation Applications

The 3RH2911-2GA31 can expand the auxiliary functionality of compatible Siemens contactor relays.

Contactor Relay Control

The auxiliary contacts can be used for status feedback and additional control logic.

PLC Systems

The contacts can be connected to suitable PLC inputs for monitoring the operating state of a contactor relay.

Machine Control

The 3 NO + 1 NC arrangement can support machine sequencing and electrical interlocking.

Industrial Control Panels

The front-mounting design provides a compact method of adding auxiliary functionality.

Automation Systems

The additional contacts can provide multiple signalling and control paths within automated machinery.

Suitable for OEMs and Panel Builders

The 3RH2911-2GA31 is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.

Its 3 NO + 1 NC contact configuration, front-mounting arrangement, spring-loaded terminals and physical coding make it a practical accessory for compatible Siemens SIRIUS contactor relays.

Key Features

• Siemens SIRIUS auxiliary contact block

• Article number 3RH2911-2GA31

• Front-mountable design

• 3 NO + 1 NC auxiliary contacts

• All contacts instantaneous

• Spring-loaded terminals

• Physically coded design

• Compatible with 3RH2140

• Compatible with 3RH2440

• Contact paths: 53/54, 61/62, 73/74, 83/84

• Suitable for PLC feedback

• Suitable for electrical interlocking

• Suitable for signalling and control

• Suitable for industrial automation

Benefits

• 3 NO + 1 NC contacts: Provides four additional auxiliary switching paths.

• Front mounting: Allows direct installation onto compatible contactor relays.

• Spring-loaded terminals: Supports convenient industrial control wiring.

• Flexible control logic: NO and NC contacts can be used for different signalling and interlocking functions.

• PLC integration: Can provide contactor-relay status information.

• Compact design: Helps maintain an organized control-panel layout.

• Physical coding: Helps ensure compatibility with the specified contactor-relay arrangement.

• Easy expansion: Adds auxiliary functionality without replacing the main contactor relay.

Why Choose Siemens 3RH2911-2GA31?

The Siemens 3RH2911-2GA31 provides a flexible auxiliary-contact solution for 3RH2140 and 3RH2440 contactor relays.

Its 3 NO + 1 NC instantaneous contact configuration, front mounting and spring-loaded terminals make it suitable for applications requiring additional contactor control, feedback, interlocking and signalling. Siemens' current product data confirms the exact contact arrangement and compatibility.

For OEMs, panel builders and automation integrators, it provides a compact way to expand the auxiliary functionality of compatible SIRIUS contactor relays.

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 3RH2911-2GA31?

It is a front-mountable Siemens SIRIUS auxiliary contact block designed for compatible 3RH2140 and 3RH2440 contactor relays.

2. How many auxiliary contacts does it provide?

It provides 3 normally open and 1 normally closed auxiliary contacts.

3. Are the contacts instantaneous?

Yes. The configuration includes 3 instantaneous NO contacts and 1 instantaneous NC contact.

4. Where is the auxiliary block mounted?

It is designed to snap onto the front of compatible 3RH2140 and 3RH2440 contactor relays.

5. What type of terminals does it use?

It uses spring-loaded terminals.

6. Which contactor relays are compatible?

Siemens specifically identifies 3RH2140 and 3RH2440 for this auxiliary contact block.

7. What are the contact paths?

The specified contact paths are 53/54, 61/62, 73/74 and 83/84.

8. What can the auxiliary contacts be used for?

They can be used for PLC feedback, signalling, interlocking, control logic and machine sequencing.

9. Does it switch the main electrical load?

No. It provides auxiliary contacts for control and signalling; the main switching function remains with the compatible contactor relay.

10. Where can I buy Siemens 3RH2911-2GA31 in India?

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