3RT2027-1AP00 Siemens Power Contactor 3RT20271AP00 New Factory Sealed

The Siemens 3RT2027-1AP00 is a 3-pole power contactor from the SIRIUS 3RT2 series, designed for switching AC induction motors in industrial machinery, production lines, and building services installations. With a 32A rating and 15kW capacity at 400V, it handles motor switching requirements for mid-sized applications including conveyor drives, pump motors, compressors, and HVAC systems.

The AC-3 (and enhanced AC-3e) utilisation category defines the contactor's designed switching duty for squirrel-cage induction motor starting and stopping. This includes closing under full locked-rotor current and opening at running speed - the most common industrial motor switching duty.

The 32A AC-3 rating indicates the contactor can switch motors drawing up to 32A at running speed while handling the associated inrush current during startup. For less demanding applications like resistive loads, the AC-1 rating allows handling up to 50A.

The 3RT2 contactor features standardized mechanical dimensions and interfaces that align with the SIRIUS modular system. This enables direct integration with compatible components:

• Overload relays from the 3RU2 range clip directly onto the contactor
• 3RA2 reversing combinations use linked contactors with factory-tested modules
• PMC function modules and auxiliary switch blocks attach to defined interface positions

This modular approach reduces design complexity, wiring time, and ensures predictable space requirements in control panels.

The 230V AC coil energizes when voltage is applied between A1 and A2 terminals. The coil draws higher inrush current during initial energization, settling to lower holding current once seated. Standard practice includes using surge suppressors across A1-A2 terminals when driven by PLC outputs to protect against inductive kickback voltage spikes.