The Siemens 3RV2901-1B Auxiliary Contact Block is a high-quality accessory designed for SIRIUS 3RV2 Motor Protection Circuit Breakers (MPCBs). This front-mounted auxiliary switch expands the functionality of motor protection devices by providing 1 Normally Closed (1NC) auxiliary contact, making it ideal for control interlocking, status indication, fault monitoring, PLC interfacing, and industrial automation applications. The module is part of the Siemens SIRIUS 3RV29 accessory range and is engineered for seamless integration with 3RV2 motor protectors.
The 3RV2901-1B mounts directly onto the front of compatible Siemens 3RV2 motor protection circuit breakers without increasing the overall width of the assembly. Its compact transverse design helps save valuable panel space while enabling additional signaling and control functions. The accessory can be installed quickly and easily, making it suitable for both new installations and retrofit projects.
Featuring 1 Normally Closed (NC) instantaneous auxiliary contact, this contact block is commonly used for safety interlocking, breaker status feedback, shutdown circuits, alarm functions, and control logic applications. The NC contact changes state instantly when the breaker operates, providing reliable status information to PLCs, relays, and monitoring systems. Similar SIRIUS auxiliary switches are widely used for motor control and signaling functions.
Designed for use with Siemens 3RV2 motor protection circuit breakers in sizes S00, S0, S2, and S3, the 3RV2901-1B offers broad compatibility across industrial motor protection systems. Its robust construction ensures dependable operation in demanding industrial environments including manufacturing plants, machine-building applications, HVAC systems, water treatment facilities, and process industries.
The auxiliary contact block utilizes durable screw terminal connections, providing secure wiring, excellent vibration resistance, and simplified maintenance. This connection method ensures long-term electrical reliability and ease of installation in industrial control panels and motor control centers (MCCs). Similar SIRIUS auxiliary switches support conductor sizes from 0.5 mm² to 2.5 mm².
As part of the trusted Siemens SIRIUS motor control portfolio, the 3RV2901-1B Auxiliary Contact Block delivers reliable performance, compact dimensions, and full compatibility with Siemens motor protection solutions. It enables improved monitoring, interlocking, and automation system integration while maintaining Siemens' high standards for industrial control equipment.
| Specification | Details |
|---|---|
| Product Name | Auxiliary Contact Block |
| Brand | Siemens |
| Series | SIRIUS 3RV29 |
| Model Number | 3RV2901-1B |
| SKU | 3RV2901-1B |
| Product Type | Auxiliary Contact Block |
| Contact Configuration | 1NC (1 Normally Closed) |
| Number of Contacts | 1 |
| Contact Type | Instantaneous Auxiliary Contact |
| Mounting Position | Front Mounted (Transverse) |
| Compatible Series | Siemens 3RV2 Motor Protection Circuit Breakers |
| Compatible Sizes | S00, S0, S2, S3 |
| Connection Type | Screw Terminals |
| Product Family | SIRIUS Accessories |
| Installation Method | Direct Snap-On Mounting |
| Rated Insulation Voltage (Ui) | 300 V |
| Protection Class | IP20 |
| Standards Compliance | IEC/EN 60947-5-1 |
| Application | Interlocking, Signaling, Status Monitoring |
| Industrial Applications | MCC Panels, Automation Systems, Motor Control Panels |
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