It snaps onto the front of a 3RH2140 or 3RH2440 auxiliary switch block, so it's a stack-on module, not a standalone device.
The snap-on mounting means it clips onto the contactor without tools — a quick push and it's seated on the DIN-rail assembly. That 41.5 mm depth and 36.5 mm width keep it within the standard S00 contactor footprint, so it won't crowd adjacent wiring. The IP20 front protection is the usual panel-side rating — fine inside a closed cabinet, but not for washdown areas. The current ratings are given per voltage — 6 A at 24 V, 2 A at 48 V, 1 A at 110 V, 0.3 A at 220 V — so match the control voltage in your circuit. The AC-12 maximum is 10 A, which is the resistive-load ceiling; the AC-15 rating at 690 V is 1 A, covering inductive solenoid loads. The mirror contact function per IEC 60947-4-1 means this switch can be used in safety circuits where you need positive opening indication — a real plus for guarding applications.
The substance prohibitance date of 07/01/2006 aligns with RoHS compliance — the switch meets the EU directive.