SIRIUS S2 power contactor — 3RT2035-1SF30
The Siemens 3RT2035-1SF30 is a SIRIUS S2-frame power contactor rated for switching motor loads in industrial control panels. The coil accepts 83 to 150 V AC/DC, with screw-type terminals for the magnet coil and main/auxiliary circuit wiring. The contactor mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, and the mounting position allows ±180° rotation on a vertical surface plus ±22.5° forward/backward tilt — useful when fitting into tight or non-standard panel layouts.
Duty cycle and switching frequency
The 3RT2035-1SF30 supports up to 1 000 switching cycles per hour in AC-1, AC-3, and AC-3e duty, 750 cycles/h in AC-2, and 300 cycles/h in AC-4. The arcing time is 10 to 20 ms, and the operating times (both AC and DC coil) are 30 to 55 ms. For a buyer comparing against a smaller SIRIUS frame like the S0 (3RT2016-1AG62), the S2 frame delivers higher mechanical endurance — 5 000 000 typical mechanical operations — and the wider coil voltage range, but the S0 is physically smaller (45 mm wide vs 55 mm) and may fit a panel where the S2 does not. The S2 is the better choice when the duty cycle demands the higher mechanical life or the coil voltage flexibility.
Integration and wiring
The contactor measures 55 mm wide, 114 mm high, and 130 mm deep. Main and auxiliary wiring accepts 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded conductors. The auxiliary switch is built in, with 1 N/O + 1 N/C configuration (18 to 1). The 83-150 V coil draws 2 VA at both 50 Hz and 60 Hz, with an inrush peak of 25 A. Ambient operating range is -25 to +60 °C; storage range is -55 to +80 °C. Clearances: 10 mm upward, 10 mm forward, 10 mm downward, 6 mm at the sides.