What this contactor is and where it fits
The Siemens 3RT2015-1MB41-0KT0 is a SIRIUS coupling contactor in size S00, designed for switching DC loads in control circuits. Its 24 V rated coil pulls in at 85% of rated value and drops out at 185%, giving a clean pickup and dropout margin for PLC or relay outputs. Rated for 10 A at 24 VDC, it handles solenoid valves, brake coils, and small DC motor contactors in the same panel. The contactor snaps onto 35 mm DIN rail per DIN EN 60715 or screws directly to a backplate. At 45 mm wide and 73 mm deep, it fits a standard 45 mm slot in a 600 mm enclosure grid. Clearance requirements are 10 mm upwards, forwards, and downwards, with 6 mm at the sides — tight enough for dense layouts if you keep the arcing zone (10 to 15 ms) clear of grounded metal.
Key ratings and what they mean for your circuit
The DC switching ratings tell you exactly what this contactor can break without welding contacts: 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. These are not continuous carry ratings — they are the make/break capability for DC inductive loads, where the arc is harder to extinguish than AC. If your load draws more than these numbers at the given voltage, step up to a larger frame. Mechanical life is rated at 30 million operations typical, which for a coupling contactor cycling once per machine cycle means decades of service in most industrial lines. The operating temperature range of -25 to +60 °C covers unheated control rooms and warm cabinets near motors; storage from -55 to +80 °C handles shipping and off-season idle. Wire terminations are screw-type, accepting solid or stranded conductors from 0.5 to 4 mm², and up to two conductors per clamp (2x 0.5-1.5 mm², 2x 0.75-2.5 mm², or 2x 4 mm²). This is useful when you need to loop through the contactor to feed a downstream device without a separate terminal block.