The Siemens 3RH2911-1HA20 Auxiliary Contact Block is a high-performance control circuit accessory designed to expand the auxiliary contact capacity of Siemens contactors and contactor relays. As part of the trusted Siemens SIRIUS 3RH29 Series, this front-mounted auxiliary switch block provides reliable control, signaling, monitoring, and automation functionality for industrial applications. Featuring 2 Normally Open (2NO) instantaneous auxiliary contacts, the 3RH2911-1HA20 is an ideal solution for engineers, OEMs, control panel manufacturers, system integrators, and maintenance professionals seeking a dependable method of expanding control circuits.
In modern industrial automation systems, auxiliary contacts are essential for machine control, PLC interfacing, operational feedback, status indication, and signaling applications. The Siemens 3RH2911-1HA20 Auxiliary Contact Block allows users to add additional switching contacts to compatible Siemens contactors without increasing panel complexity. This helps improve operational flexibility while maintaining a compact control panel design and reducing the need for additional control components.
One of the key advantages of the 3RH2911-1HA20 Auxiliary Switch Block is its 2NO contact configuration. The two normally open contacts provide additional control outputs that can be used for PLC inputs, status indication, relay activation, signaling circuits, and machine control functions. This makes the auxiliary contact block particularly suitable for motor control centers, manufacturing plants, conveyor systems, packaging machines, HVAC systems, water treatment facilities, and industrial process automation applications.
The Siemens 3RH2911-1HA20 is specifically designed for front mounting and can be snapped directly onto compatible Siemens 3RT2 contactors and 3RH2 contactor relays. The tool-free snap-on design significantly reduces installation time and simplifies maintenance procedures. Its front-mounted construction enables efficient use of control panel space while maintaining convenient access for wiring and servicing.
The auxiliary contact block utilizes robust screw terminal connections, ensuring secure wiring and long-term electrical reliability. Screw terminals are widely preferred in industrial environments because they offer strong mechanical retention, vibration resistance, and ease of maintenance. This reliable connection method helps maintain stable performance even in demanding operating conditions.
Designed according to Siemens' modular SIRIUS platform philosophy, the 3RH2911-1HA20 Auxiliary Contact Block integrates seamlessly with Siemens low-voltage control systems. The modular architecture enables simple control circuit expansion while maintaining standardized components throughout the installation. This reduces spare parts inventory requirements and simplifies future maintenance and upgrades.
The Siemens SIRIUS 3RH2911-1HA20 is engineered for demanding industrial applications and offers excellent mechanical durability and switching reliability. The auxiliary contacts support industrial control circuits requiring dependable operation over extended service periods. Siemens' proven engineering standards ensure consistent performance in continuous-duty industrial environments.
With a compact front-mounted design, the 3RH2911-1HA20 helps maximize available panel space while providing valuable additional control contacts. The device is suitable for installations involving motor starters, machine automation systems, process control equipment, material handling systems, and electrical distribution panels where additional signaling or control contacts are required.
The Siemens 3RH2911-1HA20 Auxiliary Contact Block is widely used across manufacturing facilities, process industries, OEM machinery, infrastructure projects, energy management systems, HVAC applications, and industrial automation panels. Its ability to provide additional normally open contacts without increasing control system complexity makes it a preferred accessory for modern automation systems.
At SBsmart.in, we supply genuine Siemens industrial automation products trusted by engineers, electrical contractors, OEMs, and industrial buyers throughout India. When you purchase the Siemens 3RH2911-1HA20 Auxiliary Contact Block, you receive an authentic Siemens accessory engineered for reliability, durability, and seamless integration into industrial control systems.
Whether you are expanding a control panel, adding signaling functionality, implementing PLC monitoring, or upgrading a motor control circuit, the Siemens 3RH2911-1HA20 delivers the performance and Siemens-quality engineering required for modern industrial automation applications.
| Specification | Details |
|---|---|
| Product Name | Auxiliary Contact Block |
| Manufacturer | Siemens |
| Brand | Siemens |
| Series | SIRIUS 3RH29 |
| Model Number | 3RH2911-1HA20 |
| SKU | 3RH2911-1HA20 |
| Product Type | Front Mounted Auxiliary Switch Block |
| Contact Configuration | 2NO |
| Number of Normally Open Contacts | 2 |
| Number of Normally Closed 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 |
| 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 |
| Suitable Sizes | S00 / S0 / S2 / S3 |
| Standards | IEC 60947-5-1 |
| Product Family | Siemens SIRIUS Auxiliary Contact Accessories |
| Applications | Control, Signaling, Monitoring & Automation |
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