The ABB 2TLA050003R0121 is an MKey5+Z safety interlock switch built for washdown environments — stainless steel body and head with IP67 and IP69K ingress protection. That IP69K rating means it handles 80°C high-pressure spray cleaning, so it belongs on food, beverage, or pharmaceutical lines where sanitation cycles are daily. The 40 N holding force keeps the guard closed against vibration or accidental bumping, and the 3 x M20 x 1.5 conduit entries give you room to route cables without a junction box.
Rated AC-15 A300 3A means it's designed for switching solenoid loads and contactor coils at up to 300 VA — the standard utilization category for control-circuit inductive loads. The thermal current Ith is 10 A, which is the continuous carry rating through the contacts when they're closed; that's not the switching limit, it's the heat-rise limit. Insulation rated 500 VAC / 2500 VAC covers most 400 VAC control panels with margin. Maximum approach/withdrawal speed is 600 mm/s — fast enough for a guard door that gets opened and closed at a normal pace, but if your line has a high-speed sliding gate, check the actuation profile.