Product Description

Siemens 3RH2911-1HA22 Auxiliary Contact Block – 2 NO + 2 NC

The Siemens 3RH2911-1HA22 is a front-mountable auxiliary contact block from the Siemens SIRIUS range, designed for compatible 3RT2 contactors and 3RH2 contactor relays. It provides 2 normally open (NO) and 2 normally closed (NC) instantaneous auxiliary contacts with screw-terminal connections. Siemens currently lists the article as an active product.

The accessory is designed to expand the control, feedback, interlocking and signalling capability of compatible contactors without changing their main power-switching function.

Siemens SIRIUS Auxiliary Contact Block

The 3RH2911-1HA22 adds additional auxiliary switching paths to compatible Siemens SIRIUS devices.

These contacts can be used for:

• Contactor status feedback

• PLC input signals

• Electrical interlocking

• Control-circuit logic

• Machine sequencing

• Auxiliary signalling

• Motor-control circuits

• Industrial automation

Siemens specifies the device for 3RT2.1, 3RT2.2, 3RT2.3, 3RT2.4 contactors and 3RH2 contactor relays.

2 NO + 2 NC Auxiliary Contacts

The 3RH2911-1HA22 provides four instantaneous auxiliary contacts:

2 NO + 2 NC

The contact arrangement provides two normally open paths and two normally closed paths, allowing the same accessory to support different control and signalling requirements. Siemens identifies the configuration as 2 instantaneous NC and 2 instantaneous NO contacts.

Typical uses include:

• Contactor ON/OFF feedback

• PLC monitoring

• Electrical interlocking

• Auxiliary relay logic

• Machine sequencing

• Status indication

• Alarm signalling

• Control-system feedback

Front-Snap Mounting

The 3RH2911-1HA22 is designed for snapping onto the front of compatible SIRIUS devices.

This allows additional auxiliary contacts to be added directly to the contactor or contactor relay while maintaining a compact control-panel layout.

It is useful for:

• Motor starters

• Machine-control panels

• Automation cabinets

• OEM control systems

• Industrial electrical assemblies

Screw-Terminal Connections

The auxiliary contact block uses screw terminals for its control connections. This provides a familiar wiring method for panel builders and maintenance teams and supports conventional industrial control-panel installation.

Instantaneous Auxiliary Contacts

All four contacts are instantaneous auxiliary contacts. There are no delayed auxiliary contacts in this configuration. Siemens specifies 2 instantaneous NO and 2 instantaneous NC contacts.

This makes the device suitable where the auxiliary contact state needs to follow the operating state of the connected contactor without an intentional time delay.

Compatibility with 3RT2 and 3RH2 Devices

The 3RH2911-1HA22 is designed for compatible Siemens devices including:

• 3RT2.1 contactors

• 3RT2.2 contactors

• 3RT2.3 contactors

• 3RT2.4 contactors

• 3RH2 contactor relays

The exact compatibility should be checked against the complete contactor or contactor-relay article number before installation.

Industrial Automation Applications

The auxiliary contact block can expand the control and monitoring capability of a compatible contactor.

Motor Control

The NO and NC contacts can provide contactor-state feedback, interlocking and additional control signals within motor starters.

PLC Systems

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

Machine Control

The combination of NO and NC contacts can support machine sequencing, control logic and interlocking.

Industrial Control Panels

The front-mounting arrangement provides a compact method of adding auxiliary switching functionality without installing a separate relay.

Automation Systems

The additional contact paths can provide multiple control and signalling functions within automated equipment.

Suitable for OEMs and Panel Builders

The 3RH2911-1HA22 is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.

Its 2 NO + 2 NC configuration, front-snap mounting and screw terminals make it a practical accessory for expanding compatible Siemens SIRIUS contactor and contactor-relay assemblies.

Key Features

• Siemens SIRIUS auxiliary contact block

• Article number 3RH2911-1HA22

• Front-snap mounting

• 2 NO + 2 NC auxiliary contacts

• All contacts instantaneous

• Screw terminals

• Compatible with selected 3RT2 contactors

• Compatible with 3RH2 contactor relays

• Suitable for PLC feedback

• Suitable for electrical interlocking

• Suitable for machine-control applications

• Suitable for industrial automation

Benefits

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

• Front mounting: Allows direct installation onto compatible SIRIUS devices.

• Flexible control logic: NO and NC contacts support multiple signalling and interlocking functions.

• PLC integration: Supports contactor-status feedback.

• Screw terminals: Provides a familiar industrial wiring method.

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

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

• Industrial suitability: Designed for Siemens SIRIUS contactor and contactor-relay systems.

Why Choose Siemens 3RH2911-1HA22?

The Siemens 3RH2911-1HA22 provides a practical way to expand the auxiliary functionality of compatible 3RT2 contactors and 3RH2 contactor relays.

Its 2 NO + 2 NC instantaneous contact arrangement, front-mounted design and screw terminals make it suitable for applications requiring additional contactor feedback, signalling, interlocking and machine-control functions. Siemens currently lists this article as an active product.

For OEMs, panel builders and automation integrators, it provides a compact solution for adding auxiliary control contacts directly to a compatible SIRIUS 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 3RH2911-1HA22?

It is a Siemens SIRIUS front-mountable auxiliary contact block for compatible 3RT2 contactors and 3RH2 contactor relays.

2. How many auxiliary contacts does it provide?

It provides 2 normally open and 2 normally closed contacts.

3. Are the contacts instantaneous?

Yes. The configuration includes 2 instantaneous NO and 2 instantaneous NC contacts.

4. How is it mounted?

It is designed to snap onto the front of compatible Siemens SIRIUS devices.

5. What type of terminals does it use?

It uses screw terminals.

6. Which Siemens devices are compatible?

Siemens specifies it for 3RT2.1, 3RT2.2, 3RT2.3, 3RT2.4 and 3RH2 devices.

7. What can the auxiliary contacts be used for?

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

8. Does it switch the main electrical load?

No. It provides auxiliary contacts for control and signalling; the main load remains switched by the compatible contactor.

9. Is it suitable for OEM machinery?

Yes. It is suitable for OEM machine builders, panel manufacturers, automation integrators and industrial maintenance applications.

10. Where can I buy Siemens 3RH2911-1HA22 in India?

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