The 3RH1140-2KF40: The coil is rated 110 V, with a closing and holding power of 2.3 W DC. That is a continuous-duty solenoid — it stays energized without overheating, so it can be left on for extended periods in a control panel. The built-in varistor suppresses the inductive kick when the coil de-energizes, which protects nearby electronics and extends contact life on the driving output. The four NO contacts are rated for switching at various voltages per IEC utilization categories. At 24 V the contacts carry 10 A; at 230 V they carry 6 A; at 400 V they carry 3 A; at 690 V they carry 1 A. These are the thermal current ratings (Ith) for the contact block — the actual making/breaking capacity depends on the load type. For a 110 V control circuit, the 1 A rating at 110 V is the figure to use for sizing the load side. That is a dry-circuit rating — it tells you the contacts are gold-flashed or otherwise treated to reliably switch low-energy signals without oxide buildup. For a PLC input or a 24 VDC sensor signal, this relay will not drop pulses.
Mounting is by screw or snap-on onto a DIN rail. The S00 footprint means it clips directly alongside a 3RT1 contactor or onto a busbar adapter. That covers most panel layouts without derating. Wire terminals accept 2x 0.25 to 2.5 mm² solid or stranded.
The substance prohibition date of 07/01/2006 aligns with the original EU RoHS directive. The part is RoHS-compliant as shipped.