Siemens SIRIUS 3RT2035-3NB34-3MA0 – Power Contactor, Size S2, 20-33 VDC Coil
The Siemens SIRIUS 3RT2035-3NB34-3MA0 is a size S2 power contactor with a 20-33 VDC coil and spring-type terminals, designed for screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715. Its 114 mm height, 55 mm width, and 178 mm depth fit standard panel layouts, with clearance requirements of 10 mm upwards, forwards, and downwards, and 6 mm at the side. Rated for 10 million mechanical operations typical, it handles AC-1 loads at up to 1,200 switching cycles per hour, AC-3 at 1,000 per hour, and AC-4 at 300 per hour.
Coil & Terminal Specs – What They Mean for the Build
The 20-33 VDC coil pulls 3 A peak inrush; at 24 V rated value that's 6 A, dropping to 2 A at 48 V and 60 V, 1 A at 110 V, and 0.9 A at 125 V. Pickup is at 0.8 times rated voltage, dropout at 1.1 times – so on a 24 VDC supply the contactor picks up around 19.2 V and drops out around 26.4 V. Spring-type terminals accept 2 x (0.5 to 2.5 mm²) solid or stranded wire – no ring lugs needed, which speeds wiring in high-density panels. Coil consumption is 2 VA at both 50 Hz and 60 Hz, so the control transformer sizing is straightforward.
Mounting & Clearance – DIN Rail Fit
Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715; the mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward. Main contacts are configured 18...1 (likely 3 NO + 1 NC or similar), and there is no auxiliary switch block included – plan for a separate auxiliary contactor or add-on block if needed.
Lifecycle & Sourcing – Current Production, Sourced to Order
Operating temperature range is -25 to +60 °C; storage range -55 to +80 °C.