The Siemens 3RB2056-2FW2 is a SIRIUS solid-state overload relay in the S6 frame size, rated for 200 A continuous operational current and a thermal current of 200 A. It provides electronic motor overload protection with a Class 20E trip curve. The relay covers motor power ranges from 30 to 132 kW at 500 V and 55 to 160 kW at 690 V (50 Hz), making it a fit for medium-voltage motor starters in the 200 A class. The auxiliary switch is integrated, with switching capacities rated across multiple voltages: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V, and 0.55 A at 60 V, among others.
Fastening method supports both contactor mounting (directly onto a SIRIUS contactor of matching S6 frame) and stand-alone installation on a mounting plate or DIN rail. The straight-through transformer design for the main current circuit means the power conductors pass through the relay without looping — cleaner wiring and less panel clutter. Dimensions: 120 mm wide × 119 mm high × 155 mm deep. The S6 frame is the largest in the SIRIUS overload relay range, sized for the 200 A class. Terminal capacity accepts 1× (0.5 to 4 mm²) or 2× (0.5 to 2.5 mm²) solid or stranded conductors — sufficient for control wiring but note that main power connections are via the through-hole transformers, not screw terminals. Storage and transport range is -40 to +80 °C. Vibration resistance per IEC 60068-2-6: 1–6 Hz at 15 mm amplitude, 6–500 Hz at 20 m/s², 10 cycles. Shock resistance: 15g for 11 ms. This is a panel-mounted component, not a field-device — the IP rating is determined by the enclosure it is installed in.
The Class 20E trip class defines how long the relay allows locked-rotor current to flow before tripping. Class 20 is the standard for general-purpose induction motors. Rated operational current is 200 A, and the rated insulation voltage is 1 000 V. The relay is rated for AC-3e duty up to 1 000 V, meaning it can handle motor switching with occasional jogging and inching. Operating frequency is 50/60 Hz, matching standard line frequencies worldwide. The product carries a note "for message 'tripped'" — this indicates the relay provides a dedicated signaling output that changes state when the overload trips, which can be wired to a PLC input or indicator lamp for remote fault annunciation.