S2 Frame, 24 VDC Coil — Panel Fit and Switching Capacity
The 3RT2035-1KB40 is a SIRIUS coupling contactor in the S2 frame size, meaning it occupies a 55 mm width and 130 mm depth on the DIN rail — a right-sized spec for a control cabinet where every millimeter of rail space is budgeted. The 24 VDC coil draws a 2.6 A inrush peak and holds at 10 A at rated voltage, with an operating range factor of 0.8 to 1.2 times the rated value — so the coil stays pulled in reliably even if the DC bus sags to 19.2 V. Switching frequency limits are duty-dependent: 1,200 cycles/hour in AC-1 (resistive loads), 1,000 in AC-3 (squirrel-cage motors), and 300 in AC-4 (plugging/inching) — the AC-4 ceiling is the one to watch for reversing or jogging applications.
Mounting and Terminal Details
Fastens 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° tilt forward/backward — useful when the contactor sits on a swing frame or angled sub-panel. Coil terminals are screw-type, accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded wire — no special crimp tool needed for the control wiring. Clearance distances: 10 mm upwards, forwards, and downwards; 6 mm at the sides — the arcing time is 10 to 20 ms, so those gaps keep phase-to-phase and phase-to-ground arcs from tracking.
DC Switching Capacity and Auxiliary Contacts
The main contacts are rated for DC switching at multiple voltages: 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, 3 A at 400 V, and 0.6 A at 440 V — the DC rating drops sharply above 60 V due to arc extinction limits in an air-break contactor. An auxiliary switch is built in, with 1 NO + 1 NC configuration (18 to 1 contacts for main), so it can signal its own state back to the PLC without an add-on block for basic feedback. Operating temperature range is -25 to +60 °C, storage from -55 to +80 °C — the upper operating limit of 60 °C means it can sit next to a warm transformer or drive in a non-ventilated enclosure without derating the coil.