SIRIUS Size S2 — Screw-Terminal Overload Relay for Stand-Alone Mounting
The Siemens 3RU5936-3AA01 is a SIRIUS-brand overload relay in Size S2, designed for individual (stand-alone) mounting with screw-type main circuit terminals. It fastens via screw or snap-on onto standard 35 mm DIN rail, so it drops into the same panel footprint as other SIRIUS S2 components without re-drilling the backplate.
Wire Range and Termination — Main Circuit
The screw terminals accept 1x (1 to 50 mm²) solid or stranded copper, plus 1x (18 to 1 AWG) — covering the common motor-circuit conductor sizes up to 50 mm² without needing a ferrule. For finely stranded wire with core-end processing, the range is 1x (1 to 35 mm²), which handles flexible cable in control-panel wiring.
Footprint and Environmental Limits
The enclosure measures 55 mm wide by 105 mm high by 111 mm deep — a compact S2 envelope that fits alongside contactors in a standard 400 mm-deep enclosure with room for the outgoing cables. Rated for operation from -20 to +70 °C and storage from -50 to +80 °C, so it handles the thermal extremes in a non-climate-controlled cabinet near a motor.