The Schneider Electric LC1K0901P5 is a TeSys K series 3-pole contactor rated for 9 A in AC-3 duty (motor switching) at up to 440 V, with a 230 V 50 Hz coil and a single normally-closed auxiliary contact. It's a compact panel-mount unit — 45 mm wide, 58 mm tall, 57 mm deep — designed for DIN-rail or plate mounting, and carries IP20 finger-safe protection per VDE 0106. The screw-clamp terminals accept solid or stranded wire from 0.34 to 4 mm², with a tightening torque range of 0.8 to 1.3 N·m.
The 9 A AC-3 rating is the key selection number — it tells you this contactor will switch a 3-phase induction motor drawing up to 9 A under full load, which corresponds to roughly 4 kW at 400 V. The AC-3e category extends that to energy-efficient motors with higher inrush. For resistive loads (AC-1), it handles 20 A, and for plugging/reversing duty (AC-4), it's rated at 54 A but with much shorter electrical life — 20,000 cycles vs 1.3 million for AC-3. The 1.3 W heat dissipation at rated coil hold-in means it won't cook adjacent components in a tightly packed enclosure, but the 30 VA inrush at 20 °C is worth noting for transformer-coupled control circuits. The contactor can operate at up to 3600 cycles per hour — fast enough for most conveyor or pump cycling applications. The coil operates reliably between 0.8 and 1.15 times nominal voltage, and drops out at 0.2 times nominal below 50 °C. Minimum switching capability is 5 mA at 17 V for the signalling circuit — important to verify if you're switching low-level PLC inputs through the aux contact.