The LX1FX350 is a replacement coil for the LX1F series of TeSys contactors — the part that pulls the armature in when you energize it. It's a bare coil: no built-in suppressor module, so you'll need to add a free-wheeling diode or RC snubber across the terminals if your control circuit demands it.
Mechanical durability is rated at 5 million cycles — that's the expected life of the coil's mechanical structure before wear-out, not the electrical endurance of the contactor's main poles. Maximum operating rate is 600 cycles per hour at 55 °C ambient; push it harder and the coil temperature rise will shorten life. The coil is designed for AC control circuits only; DC coils have a different impedance profile and won't hold in properly on this part.