What the size S2 frame and 110 V coil mean for your panel
The 3RT2535-1AF00 is a SIRIUS contactor in the size S2 frame — that 75 mm width by 114 mm height by 130 mm depth footprint tells you it's the mid-range body in the SIRIUS contactor family, sized for motor loads that need a 110 V 50 Hz coil pull-in. The coil voltage is 110 V at 50 Hz — that's a standard control voltage in many European and Asian industrial panels, so if your control transformer is wound for 110 VAC, this contactor drops straight in without an interposing relay.
At 110 V the auxiliary contacts carry 1 A; at 440 V they're rated 1 A; at 690 V they drop to 1 A — the current derating above 400 V is modest, so the contacts handle control circuits on 690 V systems without a problem.
Mechanical life and switching duty
For a motor starter cycling once per minute on a conveyor, that's about 19 years of continuous service before the mechanism wears out.
Clearance and side-by-side mounting
Side-by-side mounting is allowed — you can gang multiple S2 contactors without a gap.