The Siemens 3RH2911-1HA02 is a front-mountable auxiliary contact block from the Siemens SIRIUS 3RH29 accessory range. It provides 2 normally closed (2 NC) instantaneous auxiliary contacts and is designed for compatible 3RT2 contactors and 3RH2 contactor relays. Siemens identifies this exact article as a front-snapping auxiliary switch with screw terminals.
The accessory expands the auxiliary control, signalling, feedback and interlocking functionality of a compatible contactor without changing its main power-switching function.
The 3RH2911-1HA02 is used to add additional auxiliary contacts to compatible Siemens SIRIUS devices.
These contacts can be used for:
Siemens specifies compatibility with 3RT2.1, 3RT2.2, 3RT2.3, 3RT2.4 and 3RH2 devices.
The 3RH2911-1HA02 provides 2 normally closed auxiliary contacts.
Both contacts are instantaneous NC contacts, making them useful when an auxiliary circuit needs to respond directly to the operating state of the connected contactor or contactor relay.
Typical uses include:
The auxiliary contacts should be used within their applicable electrical ratings.
The accessory is designed for snapping onto the front of compatible Siemens SIRIUS devices.
This allows additional auxiliary functionality to be installed directly on the contactor or contactor relay while maintaining a compact control-panel arrangement. Siemens lists the 3RH2911-1HA02 among the front-mount auxiliary switches for S00 to S3 contactor and contactor-relay sizes.
This makes it suitable for:
The 3RH2911-1HA02 uses screw-terminal connections for the auxiliary circuits. This provides a familiar wiring method for electrical panel builders and maintenance teams.
Both contacts are instantaneous. There is no intentional time delay in this auxiliary contact block.
This makes it suitable for applications where the NC auxiliary contact should follow the operating condition of the connected contactor.
The Siemens data specifies 2 instantaneous NC contacts and no NO or changeover contacts for this configuration.
The 3RH2911-1HA02 can expand the control functionality of compatible SIRIUS devices.
The NC contacts can be used for contactor interlocking and control logic in motor starters.
The auxiliary contacts can provide suitable digital feedback to PLC inputs for monitoring contactor operation.
They can support machine sequencing, auxiliary control and interlocking functions.
Front mounting provides a compact way to add auxiliary switching functionality directly to the contactor.
The additional NC contact paths can provide control and signalling functions within automated machinery.
The 3RH2911-1HA02 is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.
Its 2 NC instantaneous contact configuration, front-snap mounting and screw-terminal design make it a practical accessory for expanding compatible Siemens SIRIUS contactor and contactor-relay assemblies.
The Siemens 3RH2911-1HA02 provides a simple and practical solution for adding two instantaneous normally closed auxiliary contacts to compatible Siemens SIRIUS contactors and contactor relays.
Its front-snap mounting, 2 NC configuration and screw-terminal connections make it suitable for applications requiring additional interlocking, signalling, feedback and machine-control functions. Siemens currently lists 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:
It is a Siemens SIRIUS front-mountable auxiliary contact block with 2 normally closed contacts.
It provides 2 NC instantaneous auxiliary contacts.
It is designed to snap onto the front of compatible SIRIUS devices.
It uses screw terminals.
It is specified for 3RT2.1, 3RT2.2, 3RT2.3, 3RT2.4 and 3RH2 devices.
Yes. Both auxiliary contacts are instantaneous NC contacts.
They can be used for PLC feedback, electrical interlocking, signalling, control logic and machine sequencing.
No. It provides auxiliary contacts for control and signalling; the main load is switched by the compatible contactor.
Yes. It is suitable for OEM machine builders, panel manufacturers, automation integrators and industrial maintenance applications.
You can explore the Siemens product range at SB Smart for Siemens auxiliary contact blocks, contactors, contactor relays and other industrial automation products.
| Specification | Details |
|---|---|
| Product Name | Auxiliary Contact Block |
| Manufacturer | Siemens |
| Brand | Siemens |
| Series | SIRIUS 3RH29 |
| Model Number | 3RH2911-1HA02 |
| SKU | 3RH2911-1HA02 |
| Product Type | Front Mounted Auxiliary Switch Block |
| Contact Configuration | 2NC |
| Number of Normally Closed Contacts | 2 |
| Number of Normally Open Contacts | 0 |
| Contact Type | Instantaneous Auxiliary Contacts |
| 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 | Safety Interlocking, Monitoring, Signaling & Control |
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