The Siemens 3RV2921-1M is a high-quality signaling switch accessory designed for SIRIUS 3RV2 Motor Protection Circuit Breakers (MPCBs). This connection module provides reliable status monitoring and signaling functions by offering separate indications for overload tripping and short-circuit events. It is widely used in industrial control panels, motor control centers (MCCs), automation systems, and machine-building applications where remote monitoring and fault diagnostics are required.
The module features 1 Normally Open (NO) and 1 Normally Closed (NC) contact for overload/trip signaling, along with 1 Normally Open (NO) and 1 Normally Closed (NC) contact for short-circuit alarm indication. This dual-signaling capability enables maintenance personnel and control systems to identify the exact cause of motor protection breaker operation, improving troubleshooting efficiency and reducing downtime.
Designed specifically for the Siemens 3RV2 series, the 3RV2921-1M mounts directly onto compatible motor protection circuit breakers and provides dependable electrical signaling without affecting the breaker's protection performance. The compact side-mounted design helps save panel space while maintaining easy accessibility during installation and maintenance.
The signaling switch utilizes robust screw terminal connections, ensuring secure wiring and long-term operational reliability in demanding industrial environments. Its durable construction makes it suitable for manufacturing plants, process industries, HVAC systems, water treatment facilities, OEM machinery, and automation projects.
By integrating the 3RV2921-1M Signaling Module into a motor protection circuit, users can achieve enhanced fault monitoring, alarm signaling, PLC interfacing, SCADA integration, and preventive maintenance capabilities. The module supports improved system visibility and helps operators quickly identify and respond to motor faults.
As part of the trusted Siemens SIRIUS portfolio, the 3RV2921-1M delivers reliable performance, high-quality engineering, and seamless compatibility with Siemens motor protection products, making it an ideal accessory for advanced motor control applications.
| Specification | Details |
|---|---|
| Product Name | Signaling Switch / Connection Module |
| Brand | Siemens |
| Series | SIRIUS 3RV29 |
| Model Number | 3RV2921-1M |
| SKU | 3RV2921-1M |
| Product Type | MPCB Signaling Switch Accessory |
| Compatible Series | Siemens 3RV2 Motor Protection Circuit Breakers |
| Mounting Position | Side Mounted |
| Contact Configuration (Trip Signal) | 1NO + 1NC |
| Contact Configuration (Short Circuit Alarm) | 1NO + 1NC |
| Total Auxiliary Contacts | 2NO + 2NC |
| Connection Type | Screw Terminals |
| Function | Separate Trip & Short Circuit Signaling |
| Application | Status Monitoring & Fault Indication |
| Integration | PLC, SCADA, Alarm Systems |
| Installation Type | Direct Mounting on MPCB |
| Industrial Applications | MCC Panels, Automation Systems, Motor Control Panels |
| Product Family | Siemens SIRIUS Accessories |
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