The Siemens 3RV1021-4AA10-ZW95 is a SIRIUS motor protection circuit breaker rated for 16 A continuous current and 7.5 kW at 400 V AC, with Trip Class 10 thermal overload protection.
This breaker delivers 100 kA at 240 V AC, 50 kA at 400 V AC, 10 kA at 500 V AC, and 4 kA at 690 V AC.
Trip Class 10 and phase failure detection
The built-in phase failure detection (yes, it's there) will trip on loss of any phase, protecting the motor from single-phasing. That's a feature you'd otherwise need a separate phase monitor for.
Screw terminals accept solid or stranded wire: 2× (1 to 2.5 mm²) and 2× (2.5 to 6 mm²) per clamp, or AWG 14–10 for the main contacts. The 96 mm depth and 45 mm width fit standard 45 mm-wide DIN-rail slots; zero clearance needed at the sides or back.
The substance prohibition date of 01.05.2012 aligns with RoHS compliance (lead, mercury, etc., restricted from that date).