The Siemens 3RH2911-1HA01 Auxiliary Contact Block is a reliable and compact control circuit accessory designed to enhance the functionality of Siemens contactors and contactor relays. As part of the globally recognized Siemens SIRIUS 3RH29 Series, this front-mounted auxiliary switch block provides 1 Normally Closed (1NC) instantaneous auxiliary contact, making it an ideal solution for control, monitoring, interlocking, safety circuits, and signaling applications in industrial automation systems. Designed to meet the demanding requirements of modern industries, the 3RH2911-1HA01 delivers dependable performance, seamless integration, and long operational life.
In industrial control systems, auxiliary contacts are essential for machine monitoring, fault detection, PLC communication, safety interlocking, and operational feedback. The Siemens 3RH2911-1HA01 Auxiliary Contact Block enables engineers and panel builders to expand the control capabilities of compatible Siemens contactors without increasing panel complexity. Its single normally closed contact is particularly useful in applications requiring fail-safe logic, shutdown sequences, protective monitoring, and interlocking functions.
One of the primary advantages of the 3RH2911-1HA01 is its 1NC contact configuration, which automatically opens when the associated contactor or relay is energized. This functionality makes it ideal for safety-related control circuits, fault indication systems, emergency stop circuits, and machine protection applications. By providing an additional normally closed contact, the device helps improve operational safety and enables more sophisticated control logic within industrial automation systems.
The Siemens 3RH2911-1HA01 Auxiliary Switch Block is designed for front mounting and can be snapped directly onto compatible Siemens 3RT2 contactors and 3RH2 contactor relays. The tool-free snap-on installation allows quick assembly and simplifies maintenance procedures. Its compact front-mounted design ensures efficient use of control panel space while maintaining easy accessibility for wiring and servicing.
Built with durable screw terminal connections, the 3RH2911-1HA01 Auxiliary Contact Block provides secure electrical wiring and long-term reliability. Screw terminals are widely preferred in industrial environments due to their excellent mechanical stability, vibration resistance, and ease of maintenance. This robust connection technology ensures dependable performance even in demanding operating conditions.
As part of the Siemens SIRIUS modular system, the 3RH2911-1HA01 integrates seamlessly into existing motor control and automation systems. The modular design allows engineers to expand auxiliary contact capacity without redesigning control panels or adding separate switching devices. This helps reduce installation costs, simplify inventory management, and improve system flexibility.
The Siemens SIRIUS 3RH2911-1HA01 Auxiliary Contact Block is engineered for long-term industrial performance. It supports a rated insulation voltage of 690V, an impulse withstand voltage of 6kV, and offers exceptional mechanical durability with up to 10 million operating cycles. These specifications ensure reliable operation in industrial environments where continuous performance and equipment uptime are critical.
Suitable for S00, S0, S2, and S3 frame sizes, the 3RH2911-1HA01 is compatible with a wide range of Siemens motor contactors and contactor relays. Its compact footprint makes it particularly valuable in motor control centers, industrial automation panels, machine-building applications, process control systems, energy management installations, HVAC systems, and infrastructure projects where additional auxiliary contacts are required without increasing cabinet size.
Industrial automation professionals trust the Siemens 3RH2911-1HA01 Auxiliary Contact Block for applications involving safety interlocking, machine protection, fault monitoring, shutdown control, and PLC feedback. The product combines Siemens engineering excellence with proven industrial reliability, making it a preferred choice across manufacturing, utilities, process industries, and OEM machinery sectors.
At SBsmart.in, we supply genuine Siemens industrial automation and control products trusted by engineers, OEMs, electrical contractors, panel builders, and procurement professionals throughout India. When you choose the Siemens 3RH2911-1HA01 Auxiliary Contact Block, you receive an authentic Siemens product backed by world-class quality, dependable performance, and long-term operational reliability.
Whether you are expanding a motor starter circuit, implementing safety interlocks, upgrading a control panel, or improving machine monitoring capabilities, the Siemens 3RH2911-1HA01 delivers the durability, flexibility, and performance required for modern industrial automation systems.
| Specification | Details |
|---|---|
| Product Name | Auxiliary Contact Block |
| Manufacturer | Siemens |
| Brand | Siemens |
| Series | SIRIUS 3RH29 |
| Model Number | 3RH2911-1HA01 |
| SKU | 3RH2911-1HA01 |
| Product Type | Front Mounted Auxiliary Switch Block |
| Contact Configuration | 1NC |
| Number of Normally Closed Contacts | 1 |
| Number of Normally Open 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 60947-5-1 |
| Product Family | Siemens SIRIUS Auxiliary Contact Accessories |
| Applications | Safety Interlocking, Monitoring, Signaling & Control |
No reviews yet.