The 3RU1136-4HB0-ZX95 is a SIRIUS size S2 thermal overload relay from Siemens, designed for contactor mounting — it snaps directly onto the matching SIRIUS contactor, no DIN-rail bracket required. The IP20 front protection keeps live terminals out of accidental contact inside the enclosure; the ATEX certification (DMT 98 ATEX G 001) qualifies it for use in potentially explosive atmospheres, so it fits motor-protection schemes in Zone 1 or Zone 2 gas environments. Screw-type terminals on both the main and auxiliary circuits accept solid conductors up to 2x (0.5…1.5 mm²) and 2x (0.75…2.5 mm²), and stranded conductors up to 2x (0.75…25 mm²) or 0.75…35 mm² single — enough for motor leads up to about 25 mm² in dual feed. The auxiliary contact ratings span 24 V at 1 A, 120 V at 3 A, 230 V at 2 A, and 400 V at 1 A, covering PLC input cards, contactor coils, and indicator lamps across common control voltages.
Clearance and mounting — panel fit
Zero clearance required upwards, forwards, backwards, and downwards — the relay sits flush against the contactor face and adjacent components. Only 6 mm side clearance is needed.