The Siemens SIRIUS 3RT2926-4PA00 is a combination screw set — M3 size, packed 100 pieces per bag — made specifically for the auxiliary current path on 3RT2.2..-4 contactors. If you are stocking spares for a panel full of those contactor frames, this is the correct bag of screws to have on hand for the control-circuit terminals.
The set is RoHS compliant per the substance prohibitance date of 10/01/2009, so it meets the standard EU material restrictions for new installations.
This is a pure accessory — no electrical rating to evaluate, no derating curve. The fit is mechanical: M3 thread, combination head (slot/Phillips), intended for the auxiliary (control) circuit terminals of the 3RT2.2..-4 contactor family. If you are replacing a lost screw or filling a kit, this is the factory-correct part.