Motor protection circuit breaker for the commissioning window
The Siemens 3RV6021-4NA10 is a SIRIUS Size S0 motor protection circuit breaker rated at 28 A operational current at AC-3, 400 V — sized for a 15 kW motor on a 400 V line, typically a conveyor or pump drive that needs to hit the install date. The thermal-magnetic overload release (Class 10) and magnetic short-circuit trip are integrated in one 45 mm wide package, so it fits standard 35 mm DIN rail per DIN EN 60715 and mounts in any position. At 11 W typical power loss, it won't cook adjacent devices in a densely packed panel.
Panel integration and mounting
Screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715. The 45 mm width (Size S0) and 96 mm depth fit standard enclosure backplates. Clearance: 50 mm upwards, 50 mm downwards, 30 mm at the side, 0 mm forwards, 0 mm backwards — so it can be stacked tight against the back panel or busbars. Screw-type terminals accept 2x (1…2.5 mm²) solid/stranded or 2x (2.5…10 mm²), with a tightening torque of 2…2.5 N·m. AWG equivalents: 2x (16…12) or 2x (14…8).
Environmental and compliance
Operates from -20 to +60 °C, transports from -50 to +80 °C, with 10…95 % relative humidity during operation. Installation altitude up to 2 000 m. Shock resistance: 25g / 11 ms per IEC 60068-2-27. Surge voltage resistance rated at 6 kV. RoHS compliance date: 05/01/2012. The part carries the SIRIUS brand designation for motor protection.