Siemens 3RT2028-1BM40 SIRIUS 3RT2 Power Contactor, 38A, 18.5kW, 220V DC Coil, 3-Pole, Size S0 Original Brand New

Overview

The Siemens 3RT2028-1BM40 power contactor is a key component of the SIRIUS modular system, designed for reliable and high-performance switching of motors and electrical loads in industrial environments. This specific model is a 3-pole AC-3e/AC-3 contactor rated for 38 A at 400 V with a switching capacity of 18.5 kW. It is equipped with a 220 V DC coil for actuation and features integrated 1 NO + 1 NC auxiliary contacts for control and signaling. Its compact Size S0 design and screw terminals simplify installation and wiring.

Key Specifications

• Product Number: 3RT2028-1BM40
• Product Type: Power Contactor (Motor Contactor)
• Series: Siemens SIRIUS 3RT2
• Switching Capacity (AC-3e/AC-3): 38 A / 18.5 kW at 400 V
• Number of Poles: 3-pole
• Control Supply Voltage (Coil): 220 V DC
• Auxiliary Contacts: 1 NO (Normally Open) + 1 NC (Normally Closed)
• Terminal Type: Screw Terminal
• Frame Size: S0
• Insulation Voltage (Rated Value): 690 V
• AC-1 Rated Operational Current: 50 A (at 400 V / 40 °C)
• RoHS Compliance: Yes

Benefits & Features

1. High Reliability: Part of the globally recognized SIRIUS 3RT2 series, ensuring high contact reliability and prolonged mechanical service life (typically 10 million switching cycles).
2. Space Efficiency: Compact Size S0 design allows for space-saving installation in control cabinets.
3. Versatile Motor Control: Ideal for switching 3-phase AC motors up to 18.5 kW / 400 V.
4. Integrated Feedback: Built-in 1 NO and 1 NC auxiliary contacts eliminate the need for an external auxiliary switch block for basic control feedback.
5. Secure Wiring: Robust screw terminal connection method ensures a secure and reliable electrical connection.
6. DC Coil: Features a 220 V DC coil for direct connection to DC control systems.
7. Global Standards: Climate-resistant and approved for worldwide use (IEC, UL/CSA, IE3/IE4-ready).

Function

• Motor Switching: Safely and efficiently switches the main circuit of 3-phase AC motors (AC-3/AC-3e operation).
• Load Switching: Suitable for switching non-motor loads such as heating systems (AC-1 operation, up to 50A).
• Control Signal Integration: The auxiliary contacts provide switching status signals for interlocking and monitoring circuits.

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