What it is and what it does
The Siemens 3RT7036-1AG00 is a SIRIUS S2 contactor — three main poles, all normally open, rated for main current circuits up to 690 V insulation voltage. It's the kind of workhorse you'd screw into a panel on 35 mm DIN rail and forget about, as long as the load stays inside its AC-3 or DC-13 envelope. Rated operational current at AC-3 hits a maximum of 690 V, and at DC-13 with 220 V it'll switch 0.3 A — enough for a medium-sized contactor coil or a solenoid valve on a lube line. The coil holds at 0.36 W DC, so the control transformer won't sweat the steady-state draw.
Mounting and integration
Snaps onto 35 mm standard mounting rail per DIN EN 50022, or screws direct to a backplate. Mounting position is flexible — ±180° rotation on a vertical surface, and you can tilt it forward or backward by ±22.5° on that same vertical surface. Side-by-side mounting is allowed, so you can pack a row of these without extra spacing. Dimensions are 55 mm wide, 112 mm tall, 115 mm deep — the S2 frame size. That depth matters when you're laying out gland plates or a shallow enclosure; 115 mm means you've got room behind the panel door for wiring bends.
Electrical ratings and what they mean for your line
Insulation voltage is rated 690 V, with a surge voltage resistance of 6 kV — that's the impulse-withstand level for a 400 V system with good coordination. Pollution degree 3 means it's happy in a typical industrial panel where conductive dust or condensation might show up. Switching frequency maxes out at 800 operations per hour under AC-3, and 250 per hour under AC-4. If you're jogging a conveyor or cycling a pump on a short interval, that AC-4 number is the one that governs — 250 cycles per hour is about one every 14 seconds, which is fine for most process starts but not for a high-speed pick-and-place. The auxiliary contacts are rated for PLC-level reliability — 17 V, 5 mA minimum switching capability — so you can feed a 24 VDC input card directly without worrying about oxide film on the contacts.
Lifecycle and sourcing reality
Terminals are screw-type on both main and auxiliary/control circuits — no spring-cage option on this variant. Wire range accepts 2x (0.5 to 1.5 mm²) solid or stranded, or 2x (0.75 to 2.5 mm²) with ferrules. That's a standard panel wire size, so no special tooling needed.