Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 3RT5046-1BB40 |
| Manufacturer | Siemens |
| Product Type | 3-Pole Power Contactor |
| Series | SIRIUS 3RT5 / 3RT6 |
| Size | S3 |
| Control Coil Voltage | DC 24 V |
| Rated Operational Current (AC-3, 400V) | 45 A |
| Motor Power Rating (AC-3, 400V) | 37 kW |
| Rated Operational Current (AC-1, 690V, 40°C) | 120 A |
| Main Contact Configuration | 3NO (3 normally open) |
| Built-in Auxiliary Contacts | None (expandable) |
| Rated Insulation Voltage (Ui) | 1000 V |
| Rated Impulse Withstand Voltage (Uimp) | 6 kV |
| Mechanical Life | ≥ 10 million operations |
| Electrical Life (AC-3) | ≥ 1 million operations |
| Coil Power Consumption (DC) | 15 W (pick-up and holding) |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -55°C to +80°C |
| Protection Class | IP20 (terminals), IP30/IP40 (coil) |
| Mounting | 35mm DIN rail or screw fixing |
| Width | 45 mm |
| Conductor Cross-section (Main) | 2.5 – 50 mm² |
| Standards | IEC 60947-4-1, UL 508 |
Main Features and Advantages
Direct PLC Integration and DC Coil Optimization: The SIEMENS 3RT5046-1BB40 is equipped with a DC 24 V coil that is specifically optimized for direct connection to PLC transistor outputs, eliminating the need for intermediate relays and reducing both cost and potential failure points. The coil features a built-in flyback diode that effectively suppresses back EMF during de-energization, protecting upstream electronic components from voltage spikes. With a power consumption of just 15 W and quiet, hum-free operation, the SIEMENS 3RT5046-1BB40 delivers significant energy savings and a quieter workshop environment compared to traditional AC-operated contactors.
High Switching Capacity and Electrical Durability: The SIEMENS 3RT5046-1BB40 provides robust switching performance with a rated operational current of 120 A in AC-1 duty for resistive loads at 690V and 40°C, and 45 A in AC-3 duty for motor starting applications. With a rated insulation voltage of 1000V and impulse withstand voltage of 6kV, the SIEMENS 3RT5046-1BB40 offers exceptional safety margins for demanding industrial environments. The contactor delivers a mechanical life of over 10 million operations and an electrical life exceeding 1 million operations under AC-3 duty, ensuring long-term reliability in high-cycle applications.
Modular Accessory System for Flexible Expansion: The SIEMENS 3RT5046-1BB40 features a standardized interface on top that accepts snap-on auxiliary contact blocks, surge suppressors, and mechanical interlocking modules. This modular design enables users to add auxiliary contacts for status feedback, install RC snubber circuits for inductive load protection, or configure mechanical interlocks for reversing applications—all without modifying the main circuit wiring. This plug-and-play flexibility of the SIEMENS 3RT5046-1BB40 proves invaluable in custom machinery and retrofit projects.
Compact Design and Finger-Safe Construction: The SIEMENS 3RT5046-1BB40 occupies just 45 mm of width in the control cabinet, maximizing panel space utilization for dense automation layouts. The contactor is constructed with IP20 finger-safe terminals and front protection according to EN 50274, ensuring operator safety during installation and maintenance. With an operating temperature range from -25°C to +60°C and storage capability from -55°C to +80°C, the SIEMENS 3RT5046-1BB40 delivers reliable performance across a wide spectrum of industrial environments.
