The Siemens 3RH2911-1HA10 is a front-mountable auxiliary contact block from the Siemens SIRIUS 3RH29 accessory range. It is designed for compatible 3RT2 contactors and 3RH2 contactor relays and provides 1 normally open (1 NO) instantaneous auxiliary contact with a screw-terminal connection. Siemens currently lists this article as an active product.
The accessory is used to add an additional auxiliary switching path for contactor control, feedback, signalling and interlocking applications without changing the main power-switching function of the connected contactor.
The 3RH2911-1HA10 provides an additional auxiliary contact for industrial control and automation circuits.
It can be used for:
Contactor status feedback
PLC input signals
Auxiliary signalling
Electrical interlocking
Control-circuit logic
Machine sequencing
Motor-control circuits
Industrial automation
Siemens specifies this auxiliary switch for compatible 3RT2.1, 3RT2.2, 3RT2.3, 3RT2.4 and 3RH2 devices.
The 3RH2911-1HA10 provides 1 normally open (NO) instantaneous contact, with the current path identified as .3/.4.
The NO contact closes when the associated contactor or contactor relay operates, making it suitable for additional control and monitoring functions.
Typical uses include:
Contactor ON feedback
PLC status monitoring
Auxiliary relay logic
Control-circuit signalling
Machine sequencing
Electrical interlocking
Auxiliary control commands
The 3RH2911-1HA10 is designed for snapping onto the front of compatible Siemens SIRIUS contactors and contactor relays.
The front-mounted configuration allows an auxiliary contact to be added directly to the device without requiring a separate external relay. Siemens identifies the product specifically as an auxiliary switch for snapping onto the front.
This design is suitable for:
Motor starters
Machine-control panels
Automation cabinets
OEM control systems
Industrial electrical assemblies
The auxiliary contact block uses a screw-terminal connection.
This provides a conventional and familiar wiring method for electrical panel builders and maintenance teams.
The connection method supports straightforward wiring of feedback, signalling and control circuits.
The 3RH2911-1HA10 is an instantaneous auxiliary switch. It has 1 instantaneous NO contact and no NC or delayed contact in this configuration.
This makes it suitable when the auxiliary output needs to follow the operating state of the connected contactor without an intentional timing delay.
The 3RH2911-1HA10 can expand the control functionality of compatible SIRIUS devices.
The NO auxiliary contact can provide contactor-status feedback within a motor starter.
The contact can be connected to a suitable PLC digital input for monitoring contactor operation.
The auxiliary contact can support machine sequencing, control logic and signalling.
The front-snap design provides a compact method of adding an additional control contact directly to a compatible contactor.
The contact can provide an additional switching path within automated equipment.
The 3RH2911-1HA10 is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.
Its 1 NO instantaneous contact, front-snap mounting and screw-terminal connection make it a practical accessory for expanding the auxiliary functionality of compatible Siemens SIRIUS devices.
Siemens SIRIUS 3RH29 auxiliary contact block
Article number 3RH2911-1HA10
Front-snap mounting
1 NO auxiliary contact
Instantaneous contact operation
Contact path .3/.4
Screw terminals
Compatible with selected 3RT2 contactors
Compatible with 3RH2 contactor relays
Suitable for PLC feedback
Suitable for electrical interlocking
Suitable for signalling and control
Suitable for industrial automation
1 NO auxiliary contact: Adds an additional normally open switching path.
Front mounting: Allows direct installation onto compatible SIRIUS devices.
Instantaneous operation: Auxiliary contact follows the operating state of the connected device.
Screw terminals: Provides a familiar industrial wiring method.
PLC integration: Can provide contactor-status feedback.
Control flexibility: Useful for signalling, sequencing and interlocking.
Compact design: Helps maintain an organized control-panel layout.
Easy expansion: Adds auxiliary functionality without replacing the main contactor.
The Siemens 3RH2911-1HA10 provides a simple solution for adding one instantaneous normally open auxiliary contact to compatible Siemens SIRIUS contactors and contactor relays.
Its front-snap mounting, .3/.4 NO contact path and screw-terminal connection make it suitable for applications requiring additional contactor feedback, signalling, interlocking or machine-control functions. Siemens currently identifies the article as an active product.
For OEMs, panel builders and automation integrators, it provides a compact way to expand auxiliary control functionality within an existing SIRIUS assembly.
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 front-mountable auxiliary contact block with 1 normally open contact.
It provides 1 NO instantaneous auxiliary contact.
The NO contact path is .3/.4.
Yes. The product is classified as an instantaneous auxiliary switch.
It is designed for snap-on mounting at the front of compatible Siemens SIRIUS devices.
It uses screw terminals.
Siemens specifies compatibility with 3RT2.1, 3RT2.2, 3RT2.3, 3RT2.4 and 3RH2 devices.
It can be used for PLC feedback, signalling, control logic, interlocking and machine sequencing.
No. It provides an auxiliary control contact; the main load remains switched by the compatible contactor.
Yes. It is suitable for OEM machine builders, panel manufacturers, automation integrators and industrial maintenance applications.
| Specification | Details |
|---|---|
| Product Name | Auxiliary Contact Block |
| Manufacturer | Siemens |
| Brand | Siemens |
| Series | SIRIUS 3RH29 |
| Model Number | 3RH2911-1HA10 |
| SKU | 3RH2911-1HA10 |
| Product Type | Front Mounted Auxiliary Switch Block |
| Contact Configuration | 1NO |
| Number of Normally Open Contacts | 1 |
| Number of Normally Closed Contacts | 0 |
| Contact Type | Instantaneous Auxiliary Contact |
| Mounting Position | Front Mounted |
| Mounting Method | Snap-On Installation |
| Connection Type | Screw Terminals |
| Compatible Devices | Siemens 3RT2 Contactors & 3RH2 Contactor Relays |
| Suitable Sizes | S00 / S0 / S2 / S3 |
| Rated Operational Current AC-15 (230V) | 6 A |
| Maximum Contact Current | 10 A |
| Rated Insulation Voltage (Ui) | 690 V |
| Rated Impulse Withstand Voltage (Uimp) | 6 kV |
| Protection Class | IP20 |
| Mechanical Endurance | Up to 10 Million Operations |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -55°C to +80°C |
| Standards Compliance | IEC 60947-4-1, IEC 60947-5-1 |
| Product Family | Siemens SIRIUS Auxiliary Contact Accessories |
| Applications | Control, Monitoring, Signaling & Automation |
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