The Siemens 3RT1023-1AK60-ZX95 is a SIRIUS S0 power contactor with screw-type terminals, sized for motor loads up to 4.5 kW at 500 V and 5.5 kW at 690 V. It snaps onto a 35 mm DIN rail per EN 50022 and fits the standard S0 panel footprint — 45 mm wide, 85 mm tall, 91 mm deep.
The coil operates at 50/60 Hz with a tolerance factor of 0.8 to 1.1 times rated voltage, so it holds in on a weak grid but drops out cleanly below the undervoltage threshold. Terminal capacity: main circuit screw terminals accept 2x 0.5–1.5 mm² solid, 2x 0.75–2.5 mm² stranded, or up to 2x 4 mm² max. For larger conductors, 2x 1–2.5 mm² and 2x 2.5–6 mm² stranded are allowed, with a single 10 mm² maximum. AWG equivalents: 2x 16–12, 2x 14–10, or 1x 8. Side-by-side mounting is permitted with 6 mm spacing, which is typical for the S0 frame.
