The Siemens 3RH2911-2HA22 Auxiliary Contact Block is a premium industrial control accessory engineered to expand the auxiliary contact capacity of Siemens contactors and contactor relays. Designed as part of the highly trusted Siemens SIRIUS 3RH29 Series, this front-mounted auxiliary switch block delivers reliable performance for control, monitoring, signaling, safety interlocking, and automation applications across a wide range of industrial environments. Featuring 2 Normally Open (2NO) and 2 Normally Closed (2NC) instantaneous contacts, the 3RH2911-2HA22 provides maximum flexibility for expanding control circuits while maintaining compact panel design.
Modern industrial automation systems require reliable feedback, signaling, and interlocking functions to ensure safe and efficient equipment operation. The Siemens 3RH2911-2HA22 Auxiliary Contact Block enables engineers and panel builders to add multiple auxiliary contacts to compatible Siemens contactors and relays without increasing system complexity. By expanding available contact points, the device supports advanced control logic, PLC interfacing, status monitoring, alarm signaling, machine sequencing, and motor control applications.
One of the key advantages of the 3RH2911-2HA22 is its 2NO + 2NC contact configuration, offering a balanced combination of normally open and normally closed contacts. This arrangement allows users to perform multiple control functions simultaneously, including operational feedback, safety interlocking, equipment status indication, and control circuit expansion. The auxiliary contacts are ideal for use in manufacturing facilities, process industries, HVAC systems, water treatment plants, packaging machinery, conveyor systems, and infrastructure projects.
The Siemens 3RH2911-2HA22 Auxiliary Switch Block is designed for front mounting and can be installed directly onto compatible Siemens 3RT2 contactors and 3RH2 contactor relays without the need for additional tools. This tool-free snap-on installation simplifies panel assembly, reduces installation time, and enables fast upgrades or replacements during maintenance operations. The compact front-mounted design helps maximize panel space while maintaining convenient access for wiring and servicing.
A standout feature of the 3RH2911-2HA22 is its spring-loaded terminal connection technology. Spring terminals provide secure electrical connections, excellent vibration resistance, and faster installation compared to conventional screw terminals. This design minimizes maintenance requirements while ensuring long-term electrical reliability in demanding industrial environments.
Built according to Siemens' modular SIRIUS system philosophy, the 3RH2911-2HA22 Auxiliary Contact Block seamlessly integrates with Siemens low-voltage control components. The modular architecture allows engineers to customize control circuits according to application requirements while maintaining system consistency and reducing spare parts inventory. This flexibility makes the product a preferred choice for OEMs, panel builders, system integrators, and maintenance professionals worldwide.
The auxiliary switch block is designed to meet demanding industrial performance requirements. With a rated operational current of 6A at AC-15, 230V, high insulation voltage ratings, and excellent mechanical durability, the device delivers dependable switching performance throughout its service life. Siemens engineering ensures reliable operation even in applications involving frequent switching cycles and continuous industrial use.
The Siemens SIRIUS 3RH2911-2HA22 is widely used in motor control centers, automation panels, machine-building applications, industrial process systems, material handling equipment, packaging lines, and energy management systems. Its ability to expand auxiliary contacts while supporting control, interlocking, and signaling functions makes it an essential component for modern automation projects.
At SBsmart.in, we supply genuine Siemens industrial automation and control products trusted by engineers, contractors, OEMs, and industrial buyers across industries. When you purchase the Siemens 3RH2911-2HA22 Auxiliary Contact Block, you receive an authentic Siemens product backed by world-class engineering, proven reliability, and long-term industrial performance.
Whether you are expanding a control panel, upgrading a motor starter, implementing advanced interlocking logic, or improving system monitoring capabilities, the Siemens 3RH2911-2HA22 delivers the performance, flexibility, and reliability required for today's industrial automation environments.
| Specification | Details |
|---|---|
| Product Name | Auxiliary Contact Block |
| Manufacturer | Siemens |
| Brand | Siemens |
| Series | SIRIUS 3RH29 |
| Model Number | 3RH2911-2HA22 |
| SKU | 3RH2911-2HA22 |
| Product Type | Front Mounted Auxiliary Switch Block |
| Contact Configuration | 2NO + 2NC |
| Number of Normally Open Contacts | 2 |
| Number of Normally Closed Contacts | 2 |
| Contact Type | Instantaneous Auxiliary Contacts |
| Mounting Position | Front Mounted |
| Connection Type | Spring-Loaded Terminal |
| Mounting Method | Snap-On, Tool-Free Installation |
| Compatible Devices | Siemens 3RT2 Contactors & 3RH2 Contactor Relays |
| Rated Operational Current (AC-15, 230V) | 6 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 |
| Product Family | Siemens SIRIUS Auxiliary Contact Accessories |
| Application | Control, Interlocking, Signaling & Monitoring |
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