What it is and what the ratings mean
The Siemens 3RB2046-1EW1 is a SIRIUS solid-state overload relay — a 3-pole device that protects motor circuits against sustained overcurrent by tracking the thermal load via straight-through transformers on the main current circuit. The CLASS 10E trip class means it will trip within 10 seconds at 7.2× the set current, which is the standard for standard-duty induction motors driving pumps, fans, and compressors where the starting transient is brief. For a motor that starts against a heavy inertial load (centrifuge, crusher), you would step up to CLASS 20 or 30 — this one is sized for the faster-starting majority. The auxiliary circuit carries one NC contact (no CO contacts) rated at 24 V / 2 A, 120 V / 4 A, and 230 V / 3 A — these are the switching limits for the signal side, not the main power path. The 4 A at 120 V is the highest rating on the table, so that is the contact's maximum resistive switching capacity; at 24 V the 2 A limit reflects the lower voltage's reduced arc-quenching ability in a DC circuit. The screw-type terminals accept solid conductors from 0.5 to 4 mm² (or 2× 0.5 to 2.5 mm²) and finely stranded with ferrule from 0.5 to 2.5 mm² (2× 0.5 to 1.5 mm²).
Where it goes and how it mounts
Stand-alone installation — no DIN-rail adapter needed, but the mounting position is any orientation, which simplifies panel layout when the enclosure is tight on vertical space. The clearance requirements are minimal: 0 mm upwards, forwards, backwards, and downwards, with only 6 mm needed at the side. That means it can be packed against other devices on three sides without derating, as long as the side gap is respected. Dimensions are 124 mm deep, 70 mm wide, 106 mm tall — a compact footprint for a 3-pole solid-state unit. Rated for operation from -25 to +60 °C, storage and transport from -40 to +80 °C, and 100 % relative humidity during operation — so it handles condensing environments in washdown zones or outdoor cabinets without conformal-coat worries. Shock resistance is 15 g for 11 ms, adequate for mounting on a machine frame or near a vibrating conveyor drive.
Compliance and lifecycle
Surge voltage resistance is rated at 8 kV, and burst immunity per IEC 61000-4-4 is 2 kV on power ports and 1 kV on signal ports (severity degree 3). That puts it in the standard industrial immunity class for a control panel fed from a typical 400 V distribution network with no special filtering. The substance prohibition date of 07/01/2006 aligns with the original EU RoHS directive — the part is RoHS-compliant for the current EU and UKCA markets.