Siemens SIRIUS 3RT1036-3XB40-1LA4 — S2 Power Contactor
The Siemens SIRIUS 3RT1036-3XB40-1LA4 is an S2-frame power contactor rated for motor switching up to 30 kW at 500 V and 41 A in AC-4 duty at 400 V, making it suited for reversing or inching applications on conveyors, hoists, and presses where high electrical wear is expected.
Switching Performance & Duty Cycle
Maximum switching rates vary by duty class: 1,000 operations per hour for AC-1 resistive loads, 800/h for AC-3 motor starting, 400/h for AC-2 slip-ring motors, and 300/h for AC-4 plugging/reversing. Arcing time sits at 10–15 ms. The coil pulls in at 0.7× rated voltage and draws 10 A at 24 V DC, dropping to 2 A at 60 V DC and 0.3 A at 220 V DC. Coil dropout delay is 20–25 ms on DC.
Installation & Environment
Dimensions: 142 mm high × 55 mm wide × 130 mm deep. The main circuit wiring accepts 2× solid conductors 0.25–2.5 mm² or 2× stranded 0.75–25 mm²; the terminal cross-section minimum at 40 °C is 16 mm².
Listed as current production. RoHS compliance date is May 1, 2012, confirming exemption-free compliance for EU markets. No official successor or phase-out notice is recorded — the 3RT1036-3XB40-1LA4 remains the active order code for this S2 contactor variant.