What it is and where it fits
The Siemens 3RT1036-1AN64 is a SIRIUS power contactor in the S2 frame size, designed for switching motor loads in control panels. It fastens via screw and snap-on mounting onto a 35 mm standard mounting rail per DIN EN 50022, so it integrates directly into a standard DIN-rail enclosure without adapters. Rated 22 kW at 400 V in AC-2 duty (slip-ring motor switching) and 30 kW at 500 V in AC-3 duty (squirrel-cage motor starting), this contactor covers the motor sizes common on conveyor drives, pumps, and compressors in a 400 V or 480 V plant. The AC-4 rating at 690 V is 11.4 kW, which matters for reversing or inching applications where the contactor breaks full-load current. The coil is rated for 50 Hz at 200 V and 60 Hz at 200...220 V, with a voltage tolerance of 0.8...1.1 at 50 Hz and 0.85...1.1 at 60 Hz. That means it holds in through typical line sags on a weak utility feed.
Key ratings and what they mean for fit
The AC-2 rating at 400 V (22 kW) is the one to check first if this contactor is replacing an existing unit in a wound-rotor motor circuit. AC-2 duty involves higher switching frequency and longer arcing times than AC-3, so the contactor's arcing time of 10...15 ms and operating time of 7...20 ms are built for that stress. For straight AC-3 motor starting, the 30 kW at 500 V rating gives headroom on a typical 480 V line — that's roughly a 40 hp motor at 480 V. The maximum switching frequency of 800 cycles per hour in AC-3 means it handles frequent start-stop cycles on a packaging line without overheating. Auxiliary contact ratings: 10 A at 24 V DC, 6 A at 230 V AC, 3 A at 400 V AC. These are the limits for pilot duty on PLC inputs or relay coils — the 24 V DC rating is the one most integrators will care about for a 24 VDC control circuit.
Lifecycle and sourcing reality
For a BOM freeze or a critical-spare min/max review, this contactor is a standard-line item — not a phase-out risk. It carries the SIRIUS brand, which has broad cross-compatibility with Siemens control gear on the same DIN rail.
Termination and panel integration
Main current circuit uses screw-type terminals. Solid conductors: 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), max 2x (0.75...4 mm²). Stranded: 2x (0.75...25 mm²). That's a wide range — it accepts everything from control-circuit pigtails up to 25 mm² motor feeders without crimping ferrules on stranded wire. Dimensions: 55 mm wide, 112 mm high, 164 mm deep. Side-by-side mounting is permitted. IP20 on the front, IP00 at the terminals. That means the front is finger-safe, but the terminal area is live — standard for panel-mount contactors. Pollution degree 3 rating suits industrial environments with conductive dust or occasional condensation. Operating temperature range -25 to +60 °C, storage -55 to +80 °C. The storage range is wider — relevant if this part sits in a spare-parts bin in an unheated warehouse.