The Siemens 3RT2035-1AG24 is a SIRIUS S2 power contactor — a three-pole, 24 VDC-coil unit rated at 6 A at 24 V. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, making it a direct fit for standard control panels. The S2 frame size keeps the footprint compact at 55 mm wide, 114 mm tall, and 174 mm deep, so it slots into crowded enclosures without re-spacing.
Mounting and clearances
Snap it onto 35 mm DIN rail or screw-mount it — the fastening method accepts both. Clearance requirements are tight: 10 mm upward, 10 mm forward, 10 mm downward, and only 6 mm at the side. That side clearance is the one to watch if you're packing multiple contactors side-by-side; 6 mm is enough for airflow but leaves no room for finger access between units. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, so you can orient it to fit the wireway layout.
Switching performance and coil data
Coil pickup and dropout times run 10–18 ms at AC, with an arcing time of 10–20 ms. That's a standard response for a contactor this size — fast enough for motor starting, not so fast that it causes nuisance tripping on inrush. The coil terminals are screw-type, accepting 2x (0.5–1.5 mm²) or 2x (0.75–2.5 mm²) solid or stranded wire. Operating temperature range is -25 to +60 °C; storage range extends to -55 to +80 °C, so it handles warehouse conditions without issue.
Duty ratings and mechanical life
The contactor is rated for different switching frequencies depending on duty class: 1,200 operations per hour at AC-1 (resistive loads), 750 at AC-2 (slip-ring motors), 1,000 at AC-3 (squirrel-cage motors), and 300 at AC-4 (plugging/inching). The AC-3e rating also sits at 1,000 ops/h. Mechanical life is listed at 10 million operations typical — that's a long service life for a panel that cycles infrequently, but if you're running near the max AC-3 rate, you'll hit that number in about 11,000 hours of continuous use. The auxiliary switch is not included on this variant, so if you need feedback, you'll add a separate auxiliary contact block.