The Siemens SIRIUS 3RT2015-2XF42-0LA2 is a size S00 contactor with a DC coil rated 72-125 V, designed for switching motor loads in industrial control panels. It snaps onto a 35 mm DIN rail per EN 50022, and the spring-type terminals accept solid or stranded wire from 0.5 to 4 mm². The main contacts are rated 20-12 A, and the contactor handles AC-4 duty up to 250 operations per hour.
Coil and switching behaviour
The DC coil picks up at 0.7 times the rated voltage and drops out at 1.25 times, giving a clean pull-in and release. Switching time at DC is 25-45 ms, and arcing time runs 10-15 ms. Inrush current peaks at 1.1 A, so the control transformer or DC supply needs to handle that momentary load without sagging.
Environmental and mounting
Operating temperature spans -40 to +70 °C, storage from -55 to +80 °C — the part is at home in a hot, dusty panel near the kiln. It mounts on a 35 mm DIN rail with screw or snap-on fastening, and the mounting position is flexible: vertical, horizontal, or tilted up to ±22.5° on a vertical surface. Clearances: 10 mm upwards, forwards, and downwards; 6 mm at the side. Dimensions are 45 mm wide, 70 mm high, 73 mm deep.
Switching capacity across voltages
The contactor's rated operational current varies with voltage and duty. At 24 V DC it handles 10 A; at 48 V and 60 V it drops to 2 A; at 110 V it's 1 A; at 125 V it's 0.9 A; at 220 V it's 0.3 A; at 230 V it's rated 0.75 hp; at 400 V it's 3 A; at 480 V it's 4.8 A; at 500 V it's 2 A; at 600 V it's 6.1 A. These numbers define the load it can switch in a given circuit voltage — match the column that fits your application.