The Siemens SIRIUS 3RT2016-2UB41 is a size S00 power contactor with a 24 VDC coil and spring-type terminals. It switches up to 10 A at 24 V rated value, making it a fit for control and auxiliary circuits in a panel that already runs on 24 VDC control power. The 45 mm wide, 70 mm tall, 73 mm deep footprint slots into a standard 35 mm DIN rail (DIN EN 60715) with screw or snap-on mounting — no extra bracket needed.
The spring-type terminals accept solid or stranded wire 0.5... 4 mm², or 2x (0.5... 4 mm²) for daisy-chaining. Clearance: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side. Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward — useful when the gland plate forces an odd orientation.