The Siemens 3RT2035-1AR60 is a SIRIUS S2-frame power contactor rated for 40 A at 480 V in AC-3 duty, which means it handles motor switching up to that current under the standard inductive load profile. The coil is screw-terminal type; the main and auxiliary contacts are also screw-clamp, accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded wire. It mounts via screw or snap-on onto a 35 mm DIN rail per DIN EN 60715, and the mounting position allows ±180° rotation on a vertical surface plus ±22.5° tilt forward and backward.
Sizing and thermal limits
The S2 frame measures 55 mm wide by 114 mm high by 130 mm deep. Clearance requirements: 10 mm upward, 10 mm forward, 10 mm downward, and 6 mm at the side. Operating temperature spans -25 to +60 °C; storage range is -55 to +80 °C. For a panel builder, the 55 mm width means it occupies three 18 mm module spaces on a DIN rail — plan the gland plate and fill factor accordingly. The 130 mm depth is the dimension that governs enclosure depth selection; it is the dimension that typically hits the back wall first on shallow enclosures.
Switching frequency and contact ratings
Maximum switching rates: 1 200 cycles per hour in AC-1 (resistive load), 1 000/h in AC-3 (motor starting), and 300/h in AC-4 (plugging/inching). The AC-3e rating matches the AC-3 rate at 1 000/h. Auxiliary contacts are rated for 10 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 3 A at 400 V. Main contact configuration is 18 to 1 — meaning one normally-open main pole plus one normally-closed? The evidence shows "For Main Contacts: 18... 1", which likely indicates the auxiliary contact arrangement: one normally-open and one normally-closed auxiliary contact integrated. Mechanical life is 10 million operations typical.
Coil and timing
Coil operates at 400 V 50 Hz (and likely 60 Hz given the 0.39 power factor at 60 Hz vs 0.36 at 50 Hz). Arcing time is 10 to 20 ms; the at-AC switching time is 10 to 18 ms. These timing figures matter for coordination with upstream short-circuit protection devices — the arc duration window affects let-through energy calculations for the SCCR.