What the ratings mean for fit
The Siemens 3RT1016-1XB43-0VE1-ZX95 is a 3-pole contactor in the SIRIUS series, size S00 frame. It switches 4 kW at 400 V three-phase — that's the AC-3 motor rating, so it handles induction motor loads up to that power without derating. The 24 V DC coil with a built-on RC element means the suppression network is integrated; no external flyback diode or snubber needed across the coil terminals, which saves panel space and one wiring step. The 1 NO auxiliary contact provides one normally-open feedback signal for the PLC or status indication. Screw terminals on size S00 accept up to 4 mm² conductors. This contactor snaps onto DIN rail EN 60715 (35 mm) — standard panel integration for a control cabinet. The built-on RC element suppresses voltage spikes at coil dropout, which keeps conducted emissions off the 24 V DC supply rail.