What it is and what it does
The Siemens SIRIUS 3RT1036-1AU00 is a size S2 power contactor designed for switching motor loads in industrial control panels. Its 30 kW rating at 500 V in AC-3 duty (cage motors, starting and stopping under load) is the headline number for sizing — that is the current it can break repeatedly during normal motor operation. For less demanding AC-2 applications (slip-ring motors), it carries 22 kW at 400 V. The contactor mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 50022, and side-by-side mounting is permitted, so you can pack multiple units in a row without derating for heat buildup in the enclosure.
Ratings that matter for fit
AC-4 rating at 400 V is 41 A — that is the current for inching and plugging duty where the contactor makes and breaks stalled rotor current. If your application involves frequent reversing or jogging, this is the figure to check, not the AC-3 number. The auxiliary contact ratings cover a wide control-voltage range: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 0.3 A at 220 V. These are the make-and-break capacities for the coil circuit of the contactor itself or for signaling back to a PLC. Operating temperature range is -25 to +60 °C, with storage from -55 to +80 °C. Pollution degree 3 (conductive pollution or dry non-conductive pollution that becomes conductive due to condensation) means it is suited for industrial environments, not clean-room or sealed-panel-only.
Wiring and termination
Main circuit terminals are screw-type, accepting solid conductors from 0.5 mm² up to 4 mm² (two per clamp) and stranded up to 25 mm² (two per clamp). At 40 °C ambient, the minimum permissible conductor cross-section is 16 mm² — a practical detail for panel builders sizing the feed. Front of the contactor carries an IP20 rating (finger-safe), while the terminals themselves are IP00 — meaning the connection points are exposed and require enclosure protection against accidental contact.
Lifecycle and sourcing
RoHS compliance date is noted as May 1, 2012, meaning the design meets the EU Restriction of Hazardous Substances directive effective from that date.