What it does and where it fits
The Siemens SIRIUS 3RV2021-4PA10 is a motor protection circuit breaker with a Class 10 trip characteristic, designed to protect induction motors against overload and short circuit. It fits into control panels under IEC and UL standards. Phase failure detection is built in; ground fault detection is not integrated.
Panel integration and mounting
Width is 45 mm, depth 97 mm, height 97 mm — a compact footprint for DIN-rail layouts. Mounting can be screw-fixed or snapped onto 35 mm rail per DIN EN 60715, in any orientation. Clearance requirements: 70 mm above and below, 30 mm to the sides, zero forward or backward. This simplifies cabinet layout planning. Terminals accept 2x 1–2.5 mm² or 2x 2.5–10 mm² solid or stranded wire via screw-type terminals (M4 main contacts).