Siemens 3RT2028-1BB40 SIRIUS Power Contactor 3-Pole, 38A, 18.5kW/400V, 24V DC Coil, Screw Terminal, 1NO+1NC Original Brand New

Overview: Robust SIRIUS 3RT2 Contactor for Motor Switching

The Siemens 3RT2028-1BB40 is a high-performance, 3-pole power contactor from the globally recognized SIRIUS 3RT2 series, designed for reliably switching IE2/IE3/IE4 motors and other electrical loads up to 38 A (AC-3). This specific model features a compact Size S0 frame, making it ideal for space-saving installations in control cabinets. It is equipped with a highly efficient 24 V DC coil and integrated auxiliary contacts, offering high contact reliability and prolonged mechanical service life.

Benefit

• Optimized Performance: Rated for 38 Amps at 400V, providing reliable switching for motors up to 18.5 kW (25 HP at 460V), ensuring smooth operation and load protection.
• Space-Saving Design: Its compact Size S0 design allows for high-density installation in modern control panels.
• DC Coil Efficiency: The 24 V DC coil offers lower holding power consumption compared to AC coils, contributing to energy savings and reduced heat dissipation within the enclosure.
• Integrated Auxiliary Contacts: Comes standard with 1 NO and 1 NC auxiliary contacts built into the base unit, simplifying wiring for control and signaling circuits.
• Flexible Integration: Part of the comprehensive SIRIUS modular system, compatible with a wide range of accessories like thermal/electronic overload relays (e.g., 3RU2, 3RB3) and additional auxiliary switch blocks.
• Reliable and Durable: Engineered by Siemens for long mechanical and electrical endurance, ensuring a long, reliable operational life.

Function

The Siemens 3RT2028-1BB40 contactor is primarily used for switching:

1. 3-Phase Motors: Controlling the start/stop function of induction motors in machinery, pumps, fans, and conveyor systems.
2. Resistive Loads (AC-1): Capable of switching resistive loads up to 50 A (at 40°C).
3. General Power Control: Acting as a high-capacity switching device in automation and power distribution circuits requiring a 24V DC control signal.

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