The Siemens 3RH2911-2GA31 Auxiliary Contact Block is a high-performance control circuit accessory designed to enhance the functionality of Siemens contactor relays in industrial automation systems. As part of the renowned Siemens SIRIUS 3RH29 Series, this front-mounted auxiliary switch block provides additional switching contacts for control, interlocking, signaling, monitoring, and automation applications. Featuring a 3 Normally Open (3NO) and 1 Normally Closed (1NC) contact configuration, the 3RH2911-2GA31 is an ideal solution for engineers, OEMs, panel builders, and maintenance professionals seeking reliable control circuit expansion.
In modern industrial environments, auxiliary contacts play a critical role in machine control, process automation, PLC interfacing, status indication, safety interlocking, and alarm signaling. The Siemens 3RH2911-2GA31 Auxiliary Contact Block enables users to increase available control contacts without redesigning existing systems. By providing three normally open contacts and one normally closed contact, this accessory allows multiple control and feedback functions to be integrated into a single compact device.
One of the key advantages of the 3RH2911-2GA31 Auxiliary Contact Block is its 3NO + 1NC contact arrangement. This configuration provides extensive flexibility for control engineers who need additional switching points for motor starters, machine control panels, process automation equipment, conveyor systems, packaging machinery, HVAC installations, and industrial signaling circuits. The three NO contacts can be used for PLC inputs, status indication, and control commands, while the NC contact supports interlocking and safety functions.
The Siemens 3RH2911-2GA31 is designed for front mounting and can be snapped directly onto compatible Siemens 3RH2140 and 3RH2440 contactor relays. Its tool-free snap-on installation minimizes assembly time and simplifies maintenance procedures. The compact front-mounted design helps maximize control panel space while ensuring easy accessibility during wiring and servicing operations.
A major feature of the 3RH2911-2GA31 Auxiliary Switch Block is its spring-loaded terminal technology. Spring terminals provide secure electrical connections, superior resistance to vibration, and faster installation compared to conventional screw terminals. This connection system helps reduce maintenance requirements while ensuring reliable long-term performance in demanding industrial environments.
Built according to Siemens' modular SIRIUS platform philosophy, the 3RH2911-2GA31 integrates seamlessly with Siemens low-voltage control systems. The modular design allows users to customize control circuits according to application requirements while maintaining system consistency and reducing inventory complexity. This flexibility makes the product highly suitable for OEM machinery, industrial automation panels, motor control centers, and process control systems.
The auxiliary contact block is engineered to deliver reliable performance under demanding operating conditions. It features a rated insulation voltage of 690V, impulse withstand voltage of 6kV, and a mechanical endurance of approximately 10 million operating cycles. The auxiliary contacts are rated up to 6A at AC-15, 230V, ensuring dependable switching performance across a broad range of industrial control applications.
Designed for industrial durability, the Siemens SIRIUS 3RH2911-2GA31 operates reliably within a temperature range of -25°C to +60°C and complies with major industrial control standards. Its compact dimensions and robust construction make it ideal for installation in automation cabinets, electrical switchboards, machine control panels, and industrial process equipment.
The Siemens 3RH2911-2GA31 Auxiliary Contact Block is widely used across manufacturing plants, power distribution systems, water treatment facilities, packaging industries, material handling applications, HVAC installations, and infrastructure projects. Its ability to provide reliable auxiliary switching, interlocking, and signaling functions makes it an essential accessory for modern industrial automation systems.
At SBsmart.in, we provide genuine Siemens industrial automation and control products trusted by engineers, contractors, OEMs, and industrial buyers across India. When you choose the Siemens 3RH2911-2GA31 Auxiliary Contact Block, you receive an authentic Siemens solution designed for long-term reliability, superior performance, and seamless integration into industrial control systems.
Whether you are expanding a motor control circuit, implementing advanced interlocking logic, upgrading an automation panel, or improving machine monitoring capabilities, the Siemens 3RH2911-2GA31 delivers the performance, flexibility, and quality expected from Siemens SIRIUS control products.
| Specification | Details |
|---|---|
| Product Name | Auxiliary Contact Block |
| Manufacturer | Siemens |
| Brand | Siemens |
| Series | SIRIUS 3RH29 |
| Model Number | 3RH2911-2GA31 |
| SKU | 3RH2911-2GA31 |
| Product Type | Front Mounted Auxiliary Switch Block |
| Contact Configuration | 3NO + 1NC |
| Number of Normally Open Contacts | 3 |
| Number of Normally Closed Contacts | 1 |
| Contact Type | Instantaneous Auxiliary Contacts |
| Mounting Position | Front Mounted |
| Mounting Method | Snap-On Installation |
| Connection Type | Spring-Loaded Terminals |
| Compatible Devices | Siemens 3RH2140 & 3RH2440 Contactor Relays |
| Rated Operational Current AC-15 (230V) | 6 A |
| Rated Operational Current AC-12 (230V) | 10 A |
| Rated Insulation Voltage (Ui) | 690 V |
| Rated Impulse Withstand Voltage (Uimp) | 6 kV |
| Protection Class | IP20 |
| Mechanical Endurance | 10 Million Operating Cycles |
| Electrical Endurance AC-15 (230V) | 200,000 Operating Cycles |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -55°C to +80°C |
| Width | 36 mm |
| Height | 41.5 mm |
| Depth | 47.7 mm |
| Product Family | Siemens SIRIUS Auxiliary Contact Accessories |
| Applications | Control, Interlocking, Signaling & Monitoring |
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