The Siemens 3RB2056-1FW2 is a SIRIUS solid-state overload relay, Size S6, rated for 200 A continuous in the main circuit. Electronic overload release gives better repeatability and temperature stability than a bimetal; it compensates for ambient temperature shifts from -25 to +60 °C. This is the part you want when the line can't tolerate the drift of a thermal bimetallic relay. Motor power coverage: 30 to 132 kW at 500 V, 55 to 160 kW at 690 V. That's a wide band — one relay covers a range of frame sizes, reducing the spare-part count on the shelf. Mounts directly onto a contactor or standalone on the panel plate. The fastening method and the 120 mm width mean it lines up with the SIRIUS S6 contactor footprint — no extra bracketry, no re-drilling the backplate.
Ratings that decide fit — the so-what on each
200 A thermal current and 200 A operational current at 480 V and 600 V. That's the continuous current the straight-through transformers can carry without saturating. If your motor FLA is under 200 A, this relay is sized correctly — no current transformer external to the relay needed. Auxiliary contact ratings cover the common control voltages: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V. These are the dry-contact signals that feed the PLC input or the contactor hold coil. Verify the minimum load of your input card — solid-state outputs sometimes need a wetting current the relay's contacts can provide. Rated insulation voltage 1 000 V. That's the withstand voltage between live parts and ground — fine for 690 V AC systems with a safety margin. No special phase-barrier needed inside the panel. Vibration resistance: 1–6 Hz at 15 mm amplitude, 6–500 Hz at 20 m/s², 10 cycles. Shock resistance 15g / 11 ms. Mount it in any position. If the panel is on a conveyor line or near a press, this relay will hold its trip settings.
Size S6 means this relay occupies the same DIN-rail or screw-mount footprint as the SIRIUS S6 contactor family. 120 mm wide, 119 mm tall, 155 mm deep. Check the enclosure depth — 155 mm plus wiring clearance needs about 180 mm back-to-front. Terminals accept 1x (0.5 to 4 mm²) or 2x (0.5 to 2.5 mm²) solid or stranded. Use ferrules on stranded for a reliable connection. The spring-cage or screw type isn't specified here, but the cross-section range is typical for a control-circuit terminal block. Operating temperature -25 to +60 °C; storage/transport -40 to +80 °C. If the panel sits in a non-climate-controlled warehouse, the relay will survive the trip — but calibrate at the operating temperature for accurate trip timing.
The 'tripped' message — what it means on the line
Listed note: 'for message tripped'. This relay has an integrated auxiliary switch that changes state when the overload trips — that contact feeds the 'tripped' signal back to the PLC or indicator lamp. No separate auxiliary block needed; the signal is built in.