The Siemens 3RT2046-1KB40 is a high-performance SIRIUS 3RT2 Series power contactor designed for reliable motor switching and industrial automation applications. Engineered for AC-3e/AC-3 duty, this 3-pole contactor is rated for 95A operational current and supports motor loads up to 45kW at 400V, making it ideal for controlling pumps, compressors, conveyors, fans, HVAC systems, and other heavy-duty industrial equipment.
Equipped with a 24V DC electronic operating coil (Variant KB40), the 3RT2046-1KB40 is specifically designed for compatibility with PLC outputs and modern control systems. The coil operates over a wide voltage range of 0.8–1.2 × Uc, ensuring reliable switching performance even during voltage fluctuations.
The contactor features 3 Normally Open (3NO) main contacts and 1 Normally Open (1NO) + 1 Normally Closed (1NC) auxiliary contacts as standard. This integrated auxiliary configuration enables efficient signaling, monitoring, interlocking, and control functions without requiring additional accessories.
A key feature of the KB40 variant is the integrated varistor surge suppressor, which helps protect control circuits from voltage spikes and switching transients. This improves system reliability, protects sensitive PLC outputs, and extends the operational life of connected automation equipment.
Built in the robust S3 frame size, the contactor utilizes durable screw terminal connections for secure conductor termination and easy maintenance. Its rugged construction makes it suitable for motor control centers (MCCs), industrial control panels, OEM machinery, manufacturing facilities, water treatment systems, and process automation installations.
Manufactured according to Siemens SIRIUS quality standards, the 3RT2046-1KB40 offers a rated insulation voltage of 1000V, high switching endurance, and a mechanical service life of up to 10 million operating cycles, ensuring dependable long-term performance in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Power Contactor |
| Brand | Siemens |
| Series | SIRIUS 3RT2 |
| Model Number | 3RT2046-1KB40 |
| SKU | 3RT2046-1KB40 |
| Product Type | Power Contactor |
| Utilization Category | AC-3e / AC-3 |
| Rated Operational Current (AC-3) | 95 A |
| Motor Rating at 400V | 45 kW |
| Number of Poles | 3 Pole |
| Main Contacts | 3 NO |
| Auxiliary Contacts | 1 NO + 1 NC |
| Coil Voltage | 24 V DC |
| Coil Variant | KB40 |
| Coil Operating Range | 0.8 – 1.2 × Uc |
| Integrated Protection | Varistor Surge Suppressor |
| Frame Size | S3 |
| Terminal Type | Screw Terminals |
| Rated Insulation Voltage (Ui) | 1000 V |
| Mounting Position | Vertical |
| PLC Compatible | Yes |
| Mechanical Life | Up to 10 Million Operations |
| Operating Temperature | -25°C to +60°C |
| Weight | Approx. 1.84 kg |
| Product Family | Siemens SIRIUS Contactors |
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