The Siemens 3RT2326-1AV00-4AA0 is a 4-pole contactor from the SIRIUS family, rated for AC-1 resistive loads at 40 A and 400 V at 40 °C. The 400 V AC 50 Hz coil pulls in the main poles, while the integrated auxiliary contact block — 1 NO + 1 NC — handles signaling or interlocking without a separate add-on. Frame size S0 keeps the footprint compact for panel integration on a DIN rail.
What the AC-1 rating means for the buyer
AC-1 is the resistive load category per IEC 60947-4-1, covering heaters, ovens, and resistive banks where inrush is minimal. The 40 A rating at 400 V / 40 °C is the continuous current the main poles carry without exceeding the temperature rise limit. For motor loads (AC-3), the contactor would derate — the AC-1 figure is the ceiling for resistive switching, not the motor rating.
Integration notes
Screw terminals accept standard copper conductors; the S0 frame snaps onto a 35 mm DIN rail per EN 60715. The auxiliary contacts — 1 NO + 1 NC — are wired at the front of the contactor, accessible with the main power cables landed. For 400 V AC 50 Hz control circuits, the coil consumption is within the typical range for S0-frame contactors, so a standard control transformer or PLC output drives it directly.
Regulatory compliance
RoHS compliant since October 2009, with REACH Article 33 information available on request. Export control classification is AL: N / ECCN: EAR99, which means no special license is required for most international shipments.