The Siemens SIRIUS 3RU2146-4MB0 Thermal Overload Relay is engineered to provide reliable thermal protection for three-phase AC motors against overload, phase failure, and excessive current. Featuring an adjustable current setting of 80–100 A, this relay ensures dependable motor protection while minimizing downtime and maintenance costs. Designed for Size S3 contactor mounting, it incorporates Class 10 tripping characteristics, screw terminal connections, and both manual and automatic reset functions, making it ideal for industrial motor control applications.
| Parameter | Specification |
|---|---|
| Brand | Siemens |
| Series | SIRIUS 3RU2 |
| Model | 3RU2146-4MB0 |
| Product Type | Thermal Overload Relay |
| Adjustable Current Range | 80–100 A |
| Tripping Class | Class 10 |
| Relay Size | S3 |
| Mounting Type | Contactor Mounting |
| Main Circuit Connection | Screw Terminal |
| Auxiliary Circuit Connection | Screw Terminal |
| Reset Type | Manual / Automatic |
| Number of Poles | 3 |
| Rated Insulation Voltage | 1000 V |
| Rated Surge Withstand Voltage | 8 kV |
| Operating Temperature | -40°C to +70°C |
| Storage Temperature | -55°C to +80°C |
| Relative Humidity | 10–95% |
| Maximum Installation Altitude | 2000 m |
| Net Weight | Approx. 0.62 kg |
| Application | Motor Overload Protection |
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