The Siemens 3RV5041-4HA10 is a SIRIUS size S3 motor protection circuit breaker rated 50 A at AC-3 duty on a 400 V line — that's the motor-switching current, not the resistive-heater rating.
The S3 frame size (174 mm deep, 70 mm wide, 165 mm tall) fits standard panel layouts; allow 50 mm clearance above and below, 30 mm at the sides for airflow and wiring access. Screw-type box terminals accept up to 70 mm² solid or 50 mm² fine-stranded with ferrules — torque to 4–6 N·m.
Electrical ratings and environment
Rated insulation voltage 690 V, surge withstand 6 kV. The magnetic short-circuit trip handles fault clearing; the thermal overload release is the primary motor protection element.