The Siemens 3RT5035-1AM00 is a SIRIUS S2 power contactor, size S2, rated for switching motor loads up to 38 kW at 400 V and 66 kW at 690 V when the ambient hits 60 °C — that's the derated figure, not the 40 °C number, so if your panel runs warm this is the rating that governs the real-world fit. It carries a 690 V rated insulation voltage and a 6 kV rated surge voltage resistance, meaning it's built for 400 V line-to-line systems with decent headroom for transient spikes — pollution degree 3 environment, so it's comfortable in a typical industrial control panel without sealed enclosures. The 55 mm width and 115 mm depth put it in the standard S2 footprint; it mounts via screw or snap-on onto 35 mm DIN rail per EN 50022, and the mounting position is flexible — you can rotate it ±180° on a vertical surface or tilt it ±22.5° forward or backward, which helps when you're squeezing it into a crowded backplate.
Coil options and auxiliary extension
The coil draws 6 A at 24 V rated value, 1 A at 110 V, and 0.3 A at 220 V — the 24 V version is the common pick for PLC-driven panels, but the 110 V and 220 V taps give you flexibility if you're working with older control transformers or a mixed-voltage cabinet. The contactor accepts auxiliary switch extensions (product extension auxiliary switch: yes), so you can add feedback contacts for PLC status monitoring or interlocking without a separate relay block.
Wiring and protection coordination
Main and auxiliary circuits both use screw-type terminals, accepting 2x (0.75 to 16 mm²) solid or stranded wire, or 2x (18 to 2) AWG. The minimum permissible cross-section at both 40 °C and 60 °C is 16 mm² — that's the same at both temperatures, so no derating on wire size when the panel runs hot. For short-circuit protection, the manufacturer specifies a fuse gL/gG: 63 A when using type of assignment 2 coordination. The power factor at 50 Hz is 0.36 — that's the coil's power factor, not the motor load, so factor it into your control transformer sizing if you're running multiple contactors on one transformer.
Mechanical and electrical endurance
Mechanical life is rated at 10,000,000 typical cycles, with a maximum operating frequency of 5,000 1/h at AC, 1,200 1/h at AC-1 maximum, 1,000 1/h at AC-3 maximum, and 300 1/h at AC-4 maximum.
Substance prohibition date is 03/01/2017 — that's the RoHS compliance effective date for this part, so it meets the EU RoHS directive for hazardous substance restrictions.