Siemens 3RT2028-2AL20-1AA0 SIRIUS Power Contactor, 3-Pole, 38A, 18.5kW, 230V AC Coil, S0, Spring-Loaded Terminal Original Brand New

Overview: Reliable Motor Switching for Industrial Applications

The Siemens 3RT2028-2AL20-1AA0 is a high-performance, 3-pole power contactor from the globally recognized SIRIUS 3RT2 family. Designed for switching three-phase motors and other high-current AC loads, this size S0 contactor is engineered for efficiency and reliability in modern industrial control panels.

It is rated for a substantial $18.5\text{ kW}/400\text{ V}$ and $38\text{ A}$ (AC-3e/AC-3), making it ideal for medium-duty motor control applications. The coil operates on $230\text{ V AC}$ (50/60 Hz), and its built-in $1\text{ NO}+1\text{ NC}$ auxiliary contacts simplify integration into control and signaling circuits. The use of robust spring-loaded terminals (sometimes referred to as spring-type terminals) ensures fast, vibration-proof, and maintenance-free wiring.

Benefit

• Exceptional Reliability: Part of the SIRIUS modular system, known for its high contact reliability and long mechanical service life (typically $10$ million operating cycles).
• Fast & Secure Wiring: Spring-loaded terminals eliminate the need for re-tightening, resist vibration, and significantly reduce wiring time compared to screw terminals, lowering installation costs.
• Space-Saving Design (Size S0): Compact footprint allows for high packing density and efficient use of space within control cabinets.
• IE3/IE4 Motor Ready: Complies with efficiency class AC-3e for switching high-efficiency motors, supporting modern energy-saving requirements.
• Integrated Auxiliary Contacts: The built-in $1\text{ NO}+1\text{ NC}$ contacts reduce the need for external components and simplify control logic.
• Wide System Compatibility: Fully compatible with a broad range of SIRIUS control devices, including overload relays, for easy construction of complete motor starters.

Function

The 3RT2028-2AL20-1AA0 serves as an electromechanical switching device used to reliably switch on and off electrical loads, primarily three-phase motors, in control circuits. The coil is energized by the $230\text{ V AC}$ control voltage, closing the main power contacts and engaging the auxiliary contacts for signaling.

Application

• Motor Control: Switching squirrel-cage motors for pumps, compressors, fans, and conveyor systems up to $18.5\text{ kW}$.
• Industrial Heating: Switching heating systems and resistive loads (AC-1 duty).
• Lighting Systems: Controlling large industrial and outdoor lighting banks.
• Automation Panels: Integration into motor starters (DOL, reversing, star-delta) and general load control circuits within machinery and plant automation.

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