The 3RV1011-1EA20-ZW97: Breaking capacity is the headline number here: 100 kA at 400 V AC and also 100 kA at 240 V AC. The 4 A continuous rating sets the full-load motor current it's meant to protect — pair it with a motor nameplate FLA at or below 4 A. The trip class is CLASS 10, which is the standard for general-purpose induction motors; it allows enough inrush time for a direct-on-line start without nuisance tripping.
The breaker is 45 mm wide, 90 mm tall, and 81 mm deep — it occupies a single 45 mm module on the rail. Zero clearance required at the back or sides, so you can butt it against adjacent devices. Mounting position is any, giving flexibility in tight enclosures. Both main and auxiliary/control circuits use spring-loaded terminals. The main circuit terminals accept solid conductors 2x (0.25... 2.5 mm²) or AWG 2x (24... 14). Finely stranded with core-end processing takes 2x (0.25... 1.5 mm²). The spring-cage design means no screw tightening — strip to the right length, push the conductor in, and it's clamped. Touch protection is finger-safe, which is a nice safety feature when working live in a panel.
Substance prohibitance date is listed as 01.01.2013, which aligns with RoHS compliance (the EU RoHS directive took effect in stages, with the main deadline in 2011 and later amendments).