The Schneider Electric LX1FF052 is a replacement contactor coil from the TeSys F range, designed for 52 V AC 50 Hz control circuits. It is the energizing element that pulls in the main contactor armature, rated for 550 VA inrush at 50 Hz cos φ 0.3 and 45 VA hold-in consumption at the same power factor. Closing time runs 23 to 35 ms, opening 5 to 15 ms.
The 52 V AC 50 Hz coil voltage is non-standard compared to common 110 V or 230 V control transformers — verify your control circuit voltage matches exactly. The dropout threshold is 0.35 to 0.55 Uc (about 18 to 29 V) at 55 °C, and the operational range is 0.85 to 1.1 Uc (44 to 57 V). This means the coil will reliably pick up at 44 V and drop out below about 29 V, which is important for brownout ride-through or undervoltage release coordination. Heat dissipation runs 12 to 16 W at 50 Hz, so the coil contributes measurable heat inside the enclosure. In a densely packed panel with multiple TeSys F contactors, this adds up — account for it in your thermal budget. The coil has no built-in suppressor module, so you must add an external RC snubber or varistor across the coil terminals to limit switching transients and protect the PLC output driving it. That's about 40 operations per minute — fine for most conveyor or pump cycling, but not for high-speed indexing applications.